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Rae VRAE PGM-7800, Operation And Maintenance Manual

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Rae VRAE PGM-7800 Operation And Maintenance Manual Download Page 130

THEORY OF OPERATION 

6 - 1 

6  THEORY OF OPERATION 

VRAE

 monitor uses up to five different sensors to measure 

a variety of gases.  A newly developed thermal conductivity 
sensor is combined with a catalytic combustible gas sensor 
(See Figure 6.1).  The thermal conductivity sensor will 
detect a broad range of gases.  Up to three electrochemical 
toxic gas sensors (four in PGM-7840 model) can be 
installed in the monitor to measure inorganic toxic gases.  
Many different type of toxic sensors are offered.  They can 
be plugged into these three sensor sockets and are 
interchangeable.  An electrochemical sensor is used to 
measure oxygen concentration in PGM-7800 model.  

 
 

 

 
 

 

 

 

 

 

 

Figure 6.1   Block Diagram of VRAE PGM-7800 Monitor 

 
The five sensors are mounted next to the gas inlet probe.  A 
diaphragm pump is installed inside the monitor to draw  the 

Micro-
processor 

LCD display 

Keypad 

Serial 
port 

Battery 

TOX2 

TOX1 

LEL/VOL 

OXY (Or TOX4) 

Sample

 

Pump

 

Light 
sensor 

LED 

Buzzer 

Charger 

TOX3 

Summary of Contents for VRAE PGM-7800

Page 1: ...VRAE MULTI GAS MONITOR PGM 7800 7840 OPERATION AND MAINTENANCE MANUAL Document No 017 4001 Rev E RAE SYSTEMS INC 1339 Moffett Park Drive Sunnyvale CA 94089 July 2001 ...

Page 2: ...VOC Monitor ToxiRAE PLUS PID Monitor ToxiRAE PLUS Single Gas Monitors ToxiRAE PLUS Oxygen Monitor ToxiRAE PLUS Combustible Gas Monitor MiniRAE PLUS Classic PID ModuRAE Fixed System PID AreaRAE Wireless Multi point Multi gas Detection Systems How can I be informed and updated Be sure t o mail in your warranty card email or fax us to get on RAE s private database information is never supplied to oth...

Page 3: ...AE 4 1 4 1 Programming Mode 4 2 4 2 Keys for Programming Mode 4 4 4 3 Entering into Programming Menu 4 5 4 4 Calibration of VRAE Monitor 4 7 4 4 1 Fresh Air Calibration 4 8 4 4 2 Multiple Sensor Calibration 4 10 410 4 4 3 Single Sensor Calibration 4 13 4 4 4 Modify Span Gas Value 4 16 4 4 5 Change LEL Span Gas 4 17 4 5 Change Alarm Limits 4 19 4 6 View or Change Datalog 4 21 4 6 1 Reset Peak and M...

Page 4: ...ocess the Configuration Data 5 8 5 5 1 Edit the Configuration Data 5 9 5 5 2 Send Configuration to VRAE 5 21 5 5 3 Receive Configuration Data 5 22 5 5 4 Configure All Settings 5 23 5 6 Process the Logged Data 5 24 5 6 1 Receive Data from VRAE 5 25 5 6 2 View Logged Data in Text Mode 5 26 5 6 3 View STEL TWA AVG Value 5 28 5 6 4 View Summary Information 5 29 5 6 5 View Logged Data in Graph Mode 5 3...

Page 5: ...ESPONSE INFORMATION B 1 APPENDIX C V RAE DATA CONVERSION TO MICROSOFT EXCEL C 1 APPENDIX D RAE SYSTEMS TECHNICAL NOTES D 1 APPENDIX E RAE SYSTEMS APPLICATION NOTES E 1 APPENDIX F LITERATURE REQUESTFORM F 1 APPENDIX G RETURN AUTHORIZATION FORM G 1 Main Contact Numbers Outer Back Cover ...

Page 6: ...h the manufacturer s instructions CAUTION To reduce the risk of electric shock turn off power before removing the monitor cover Disconnect the battery before removing sensor module for service Never operate the monitor while the cover is removed Remove monitor cover and sensor module only in an area known to be non hazardous The model PGM 7800 and PGM 7840 equipment are classified as to intrinsic ...

Page 7: ... discharge slowly even if it is turned off If the monitor has not been charged for 5 7 days the battery voltage will be low Therefore it is a good practice to always charge the monitor before using it It is also recommended to fully charge the monitor for AT LEAST 10 HOURS before initial use See Section 7 for more information on battery charging and replacement 3 When a monitor is turned on the fi...

Page 8: ...ns AVERTISSEMENT Utiliser seulement l ensemble de batterie RAE Systems la reference 012 3050 012 3051 au 012 3052 Cet instrument n a pas été essayé dans une atmosphère de gaz air explosive ayant une concentration d oxygène plus élevée que 21 La substitution de composants puet compromettre la sécurité intrinsique Ne charger les batteries que dans emplacements désignés non dangereux STATIC HAZARD Cl...

Page 9: ... personnel qualifié Étudier le manuel d instructions en entier avant d utiliser d entretenir ou de réparer l équipement CALIBRATION WARNINGS The calibration of all newly purchased RAE Systems instruments should be tested by exposing the sensor s to known concentration calibration gas es before putting the unit into service for the first time For maximum safety the accuracy of the VRAE should be ch...

Page 10: ...oit être verifier en exposant l instrument a une concentration de gaz connue par une procédure dietalonnage avant chaque utilisation journalière CAUTION Any rapid up scale reading followed by a declining or erratic reading may indicate a gas concentration above the upper scale limit which may be hazardous AVERTISSEMENT Toute lecture rapide et positive suivie d une baisse subite au erratique de la ...

Page 11: ...PGM 7840 the displays will be similar However the oxygen reading will be replaced by a toxic sensor reading and the name oxy will be replaced by the name of the toxic sensor The VRAE monitor detects inorganic toxic gases and oxygen concentration with the electrochemical sensors It also monitors combustible gases with a catalytic bead sensor and a broad range of gases with a thermal conductivity de...

Page 12: ...0 oxygen combustible TCD and three toxic gas sensors PGM 7840 one combustible TCD and four toxic gas sensors Battery Rechargeable 4 8V 1250 mAh Ni MH battery pack with built in charger 10 hours charge time or a 4 AA alkaline battery adapter Operating Time Up to 10 hours continuous operation Display 2 line 16 digit LCD with LED back light automatically in dim light Keypad 1 operation key and 2 prog...

Page 13: ...sec O2 0 30 0 1 15 sec LEL 0 100 1 15 sec VOL 0 100 1 20 sec HCN 0 100 ppm 1 ppm 200 sec NH3 0 50 ppm 1 ppm 150 sec PH3 0 5 ppm 0 1 ppm 60 sec ClO2 0 1 ppm 0 1 ppm 150 sec Alarm 90 dB buzzer and flashing red LED to indicate exceeded preset limits low battery or sensor failure Calibration Two point field calibration for fresh air and standard reference gas Attachment Rubber boot belt clip and wrist...

Page 14: ...adings 54 hours 5 channels at 1 minute interval in non volatile memory Datalog Interval Programmable 1 3600 sec External Alarm Optional plug in pen size vibration alarm External Printer Optional plug in serial thermal printer Communication Download data to PC and upload monitor setup from PC through RS 232 link to serial port on PC Temperature 20o to 45oC 4o to 113o F Humidity 0 to 95 relative hum...

Page 15: ...tes alarm signals whenever the exposure exceeds preset limits Prior to factory shipment the VRAE is preset with default alarm limits and the sensors are pre calibrated with standard calibration gas However the user should calibrate the instrument before the first use After the monitor is fully charged and calibrated it is ready for immediate operation ...

Page 16: ...s for the user to interact with the monitor 1 operation key a nd 2 programming keys for normal operation or programming of the monitor LCD display with backlight to show real time and calculated measurements Buzzer and red LED for alarm signal w henever the exposures exceed preset limits Wrist strap Charge contact Keys LCD Display LED alarm Serial port Wrist strap Gas Outlet Gas Inlet ...

Page 17: ...OPERATION OF VRAE 2 3 Charge contact for plugging directly to the charging station Gas entry and exit port Serial communication port for PC interface Analog output and external alarm output port ...

Page 18: ...LCD display and the keypad on the front panel of the monitor The functions of the 3 keys during normal operation are summarized in Table 2 1 on the next page Figure 2 2 Keypad and Display of the VRAE Multi Gas Monitor MODE N Y ON Charging LED Light Sensor Alarm LED ...

Page 19: ...itor Monitor will beep once per second during power down sequence Press MODE key momentarily to choose different display modes see Section 2 4 for details Display The VRAE multi gas monitor includes a 2 line 16 digit dot matrix LCD display The LCD shows the following eight types of displays during normal operation if the MODE key is pressed Real time instantaneous gas concentration in ppm for toxi...

Page 20: ...he toxic gases in ppm Battery voltage and shut down voltage in volts Real time clock run time and temperature Datalogging mode or Start Stop Datalog menu to to turn datalogging on off if manual datalogging mode is selected LEL VOL gas names if the LEL or LEL VOL sensor is installed Pump speed adjustment High Low LEL VOL sensor operating mode selection Communicate with PC menu to send or receive da...

Page 21: ...yed The sensor can be used beyond this date if it still calibrates properly and has enough resolution as tested by the raw readings see Section 8 and Technical Note 123 Next the monitor displays the preset alarm limits for each sensor battery voltage shut down voltage user mode alarm mode datalog mode available data storage memory in hours datalog mode and datalog interval in seconds Then after a ...

Page 22: ...During the power off period the real time clock will continue to operate until the battery is completely drained usually in 5 7 days without any charging If the battery is completely drained or is disconnected from the monitor for more than 30 minutes the real time clock will be lost In this case the user needs to enter the real time clock information again as described in Section 4 Datalog versus...

Page 23: ...OPERATION OF VRAE 2 9 For instructions and operations of datalog features please refer to Sections 4 6 and 5 of this manual ...

Page 24: ...quence in text mode The four displays are arranged in a round robin order To choose a specific display press the MODE key one or more times until the desired display appears In the display mode the VRAE multi gas monitor displays eight different readings instantaneous gas concentration sensor name Peak minimum STEL TWA battery voltage and shut down voltage in volt run time in hours and minutes and...

Page 25: ...nter user information or calibrate the monitor etc The programming mode will be explained in detail in Section 4 Below is the display sequence in display and program mode The thirteen displays are arranged in a round robin order Appears only if the option is enabled To choose a specific display press the MODE key one or more times until the desired display appears Run time Clock Temperature Instan...

Page 26: ... gas concentration in parts per million ppm for toxic gases of volume for oxygen and of volume or of LEL for combustible gases The reading is updated once per second and is shown in the LCD display 0 0 0 0 0 20 9 2 The sensor names are displayed as LEL For combustible gas sensor OXY For oxygen sensor not for PGM 7840 CO H2S etc For up to 3 toxic sensors 4 for PGM 7840 CO SO2 H2S LEL OXY 3 The Peak...

Page 27: ...per minute and is shown in the LCD display with STEL message For the first 15 minutes will be displayed This reading applies to toxic gases only The model PGM 7840 will have one more reading displayed on the right of the STEL 0 0 0 0 STEL 6 The TWA reading is the accumulated reading of the gas concentration divided by 8 hours since the monitor was turned on The reading is updated once a minute and...

Page 28: ...he LCD display The shut down voltage is also shown Note a fully charged battery pack should show 4 8 volts or higher When the battery voltage falls below 4 4 volts a flashing Bat will appear as a warning message plus a buzzer alarms every second This means there is 20 30 minutes run time left before the monitor will be turned off automatically when the battery voltage falls below 4 2 volts Battery...

Page 29: ... datalogging Likewise pressing the Y key while Stop Datalog message is displayed turns off the datalogging 10 The monitor displays the selected LEL gas name if the combustible sensor is installed When an LEL gas is selected the calculated gas concentration based on the built in correction factor for that specific gas will be displayed 11 The monitor displays pump speed High or Low Press Y key to a...

Page 30: ...e OK to remind the users that during PC communication there will be no real time monitoring of the gas concentration Press Y key to proceed and the monitor enter the communication standby mode The LCD then displays Ready Connect the monitor to the serial port of a PC The monitor is then ready to receive any command from PC see Section 5 for details on communications between VRAE and PC Note When t...

Page 31: ...RAE 2 17 Display time out In all displays the LCD will automatically return to the instantaneous reading in display or program mode or sensor name in text mode after a one minute timeout interval if no key is pressed ...

Page 32: ...off pump stalls reading is over range or when datalog memory is full When the low battery alarm occurs there will be approximately 20 30 minutes of operating time remaining When the battery voltage falls below 4 2 V the monitor will be turned off automatically Alarm Signal Disabled It is extremely important to note that during the following conditions the alarm signals are disabled 1 When entering...

Page 33: ...larm Signal Summary The various alarm signals are summarized here Condition Alarm Signal Gas exceeds High Alarm limit 3 beeps flashes per second plus sensor name and High message on LCD Gas exceeds Low Alarm limit 2 beeps flashes per second plus sensor name and Low message on LCD Gas exceeds STEL 1 beep flash per second plus sensor name and STEL message on LCD Gas exceeds TWA 1 beep flash per seco...

Page 34: ... Testing Under normal non alarm conditions it is possible to test the VRAE LED buzzer and back light by pressing the Y key momentarily The buzzer beeps once and the LED and back light flashes once to indicate that these alarm signals are functioning correctly WARNING The alarm signals are disabled during PC communication calibration or datalog review operation To reduce the risk of exposure to haz...

Page 35: ...fter a pre programmed time out period to save power In automatic mode the ambient light is sensed and the back light will be turned on automatically if the ambient light is below a threshold level The back light will be turned off automatically when the ambient light exceeds the threshold level See Section 4 and Section 5 for details on how to set back light mode and time out period from the monit...

Page 36: ...alibrations or alarm limits are required Table 2 2 Factory Calibration and Preset Alarm Limits Gas ppm Cal Gas Balance Unit TWA STEL Low High CO 50 Air ppm 35 100 35 200 H2S 25 N2 ppm 10 15 10 20 SO2 5 N2 ppm 2 5 2 10 NO 25 N2 ppm 25 25 25 50 NO2 5 Air ppm 1 1 1 10 Cl2 10 N2 ppm 0 5 1 0 5 5 O2 20 9 N2 19 5 23 5 CH4 50 Air LEL 10 20 CH4 20 N2 Vol 10 20 HCN 10 N2 ppm 5 5 5 50 NH3 50 N2 ppm 25 35 25 ...

Page 37: ...n increased LEL sensor lifetime The low speed is the default setting so to achieve the high speed performance this needs to be switched to high see Section 4 7 for details of how to select the pump speed A high pump speed is required when measuring certain gases in order to reduce the absorption of these gases by the materials in the gas passage These gases include Cl2 ClO2 PH3 NH3 and HCN If liqu...

Page 38: ...e also stored All data is retained in non volatile memory so that it can be downloaded at a later time to a PC Start stop datalog There are four ways to initiate the datalog operation automatic start and stop datalogging automatically when the monitor is turned on and off manual start and stop datalogging by pressing a key manually periodic start and stop datalogging daily based on preset time hou...

Page 39: ...atic Datalogging Datalogging is automatically started when the monitor is turned on Scheduled Start Stop Datalogging Data logging starts at a specific date and time and logs data at the specified data logging period When the stop date and time is reached the monitor stops datalogging This mode requires that the monitor be turned on first before the datalogging can start Periodic Start Stop Datalog...

Page 40: ...ing conditions the datalogging will be paused automatically 1 When entering programming mode datalogging will stop Upon exiting the programming mode the datalogging will resume 2 When entering PC Communication standby mode datalogging will stop Upon exiting the PC communication standby mode datalogging will resume only if datalogging mode was set to automatic mode 3 When printing data to serial pr...

Page 41: ...OPERATION OF ACCESSORIES 3 1 3 OPERATION OF ACCESSORIES The accessories for VRAE include Battery Charger Alkaline Battery Adapter Water Trap Filter ...

Page 42: ...next page is required press N key and the charging function will begin If a key is not pressed within ten seconds the charging will begin automatically The display will show Charging Battery 5 6V 3 The charging LED should be red in color when charging If the battery is fully charged the LED will change from red to green The red color indicates that the battery is being fast charged The green color...

Page 43: ...itry a maximum charge time is imposed so removing the charger is not necessary The battery of the VRAE monitor will be drained slowly even if the monitor is turned off If the monitor has not been charged for 5 7 days the battery voltage will be low The factory supplied battery is designed to last for 10 hours of normal operation no alarm no back light condition for a new battery under the best con...

Page 44: ...educe the risk of ignition of hazardous atmospheres recharge battery only in area known to be non hazardous Remove and replace battery only in area known to be non hazardous Ne charger les batteries que dans emplacements designes non dangereux ...

Page 45: ...ions when there is no time to charge the NiMH battery Figure 3 2 Alkaline Battery Adapter To install the adapter remove the cover of the monitor remove the NiMH battery pack from the battery compartment and place the alkaline battery adapter into the battery compartment The internal charging circuit will automatically detect the alkaline battery adapter and prevent charging of the battery Note The...

Page 46: ...ntering the monitor and prolong the operating life of the sensor To install the water trap filter simply insert the water trap into the front of the inlet probe Some gases such as Cl2 ClO2 PH3 NH3 and HCN could react with filtered particles or water or be absorbed by the water trap housing material In these cases the water trap filter can be removed If the filter is not used extra care should be t...

Page 47: ...ovide intuitive end user operation The display shows the menu options and the key pad is used for menu selection and data entry Note The real time monitoring of the gas concentration continues while in the programming mode However during the calibration or review datalog procedures the real time monitoring will pause until the procedures are completed In addition entering programming mode will pau...

Page 48: ... on setting up the user mode The programming mode allows the users to change the setup in the monitor calibrate the monitor modify the sensor configuration and enter user information etc The programming functions are organized in a three tiers menu structure Table 4 1 shows the first tier of the programming menu Each menu item includes several sub menus to perform additional programming functions ...

Page 49: ...e level 2 However level 0 security does not allow a user to save any changes to the alarm limits real time clock correction factor user and site information etc A user can still perform calibration with level 0 security The security level must be set using a PC see Section 5 0 for details on setting up the security level Once inside the programming mode LCD will display the first menu Each subsequ...

Page 50: ...ramming mode as summarized below Table 4 2 Key Function in Programming Menu MODE Exit menu when press momentarily or exit data entry mode when pressed and held for 1 second Y Increase alphanumerical value for data entry or confirm yes for a question N Decrease alphanumerical value for data entry or deny no for a question ...

Page 51: ... level is 0 or 2 after holding down two keys for 3 seconds or more the monitor will enter the programming mode and the first menu item Calibrate Monitor will be displayed 4 If the security level is 1 or user mode is text mode after holding down the two keys for three seconds the display will show Enter Password 0000 with the left most digit flashing The user should enter a password starting from t...

Page 52: ...the flashing cursor to the next digit to the right 7 Repeat Step 5 until all four digits are entered Press and hold MODE key for one second 8 If the entered password is correct the monitor enters the programming menu The first menu item Calibrate Monitor will be displayed 9 If the password is incorrect the display shows Wrong Password and returns to the regular display of instantaneous gas reading...

Page 53: ...sensors in the VRAE monitor This is a two point calibration process using fresh air and the standard reference gas also known as Span Gas First a fresh air which contains 20 9 and no detectable toxic or combustible gases is used to set the zero point for each sensor Then a standard reference gas which contains a known concentration of a given gas is used to set the second point of reference The tw...

Page 54: ...an also be used A charcoal filter should be used if one is not sure of the ambient air s purity If the unit is in VOL or Autorange mode a second zero is performed with the VOL zero gas typically pure nitrogen This zeroing step affects only the VOL sensor and does not modify the O2 calibration performed in the first zero step In Autorange mode the first step zeros the LEL sensor In VOL mode the fir...

Page 55: ...h air calibration of the monitor The display shows zero in progress followed by the name of each sensor and the message zeroed The display should show a reading 0 0 or a very small number for all sensors For the oxygen sensor in model PGM 7800 it should show a 20 9 as the reading 1 After about 30 seconds pause the display will show the message Zero Cal Done Reading and the instantaneous fresh air ...

Page 56: ... over the gas inlet port of the VRAE Monitor and connect the tube to the mixed gas bottle as shown in Figure 4 4 1 1 Continuing from Step 4 of the previous section the display should show Multiple Sensor Calibration Press the Y key The display shows all the pre selected gases for the mixed gas bottle and OK question as shown below for PGM 7800 Press Y key to accept the multiple sensor selection an...

Page 57: ...e sensors should be calibrated separately in a Single Sensor Calibration Section 4 4 3 3 This completes the multiple sensor calibration procedure and moves to the next sub menu item 4 Turn off the flow of gas Disconnect the calibration adapter from the VRAE Monitor 5 Press the MODE key any time during Step 2 to abort the calibration If a sensor failed the calibration the sensor name and an error m...

Page 58: ...e To confirm the new selection press the Y key to accept the change and continue on with Step 2 Press the N key or the MODE key to discard the change and to continue on with Step 2 Cross Sensitivity Some sensors may show cross sensitivity to other gases Therefore it is important to choose the gas mixture carefully for the multiple sensor calibration to avoid erroneous calibration due to cross sens...

Page 59: ...ation Press Y key The display shows all the installed sensors in the monitor with the cursor blinking at the first sensor location Press Y key to select the high lighted sensor and start the calibration or press MODE key momentarily to move to the next sensor location CO SO2 H2S LEL pick OXY 2 Turn on the valve of the CO gas bottle to start the flow of the span gas Display shows Apply CO Gas and t...

Page 60: ...display shows the single gas calibration sub menu for the user to select another sensor or move to next calibration sub menu 4 Turn off the flow of gas Disconnect the calibration adapter from the VRAE Monitor 5 Repeat Step 1 to Step 5 to calibrate the next sensor 6 Press the MODE key any time during Step 2 abort the calibration If the sensor failed the calibration the sensor name and an error mess...

Page 61: ...ns of the oxygen e g 19 5 to calibrate the oxygen sensor A question 0 oxygen will be asked Enter Y if pure nitrogen gas is used to calibrate the oxygen sensor Otherwise enter N to calibrate the oxygen sensor to another span oxygen value During both single or multiple sensor calibration the oxygen sensor will be calibrated to the span value defined in Section 4 4 4 Note After a 0 oxygen calibration...

Page 62: ...as values go to Step 3 Otherwise press and hold the MODE key for 1 second to accept the previously stored span gas value and move to the next calibration sub menu 3 Starting from the left most digit of the span gas value use Y or N key to change the digit value and press MODE key momentarily to advance to next digit the cursor will move to the next digit to the right Repeat this process until all ...

Page 63: ...on algorithm for different gases 1 Change LEL Span Gas is the next sub menu item in Table 4 3 2 Press Y key If a LEL sensor is installed or a combination LEL VOL sensor is installed and the sensor is set to LEL mode the display shows LEL Span Methane If in VOL mode the display shows Vol span Methane If no LEL VOL sensor is installed the message No LEL installed will appear 3 If the user does not w...

Page 64: ...OGRAMMING OF VRAE 4 18 5 The display shows Save To confirm the new gas selection press the Y key to accept the change Press the N key or the MODE key to discard the change and return to the first display ...

Page 65: ...ser to change the high alarm limit low alarm limit STEL alarm limit or average alarm limit The lower left position may toggle between different values when switching between LEL or Autorange or VOL modes The average alarm limit can be Running Average or TWA Time Weight Average depending on the menu selection on Change Averaging Method see Section 4 7 8 Press N to circle through the sub menu Press ...

Page 66: ... to the next digit to its right Repeat this process until all the new Alarm limits are entered Press and hold the MODE key for 1 second to exit data entry mode If there is any change to the existing value the display shows Save Press the Y key to accept the new value and move to the next sub menu Press the N key to discard the changes To preserve the previously stored alarm limit press and hold th...

Page 67: ...ramming mode Users can also program additional datalog options in a PC and download them to the monitor see Section 5 0 for details on how to program additional datalogging options Table 4 5 shows the sub menus for datalog options Table 4 5 Datalog Sub Menu Reset Peak and Minimum Clear All Data Change Datalog Period Select Data Type View Datalog Enable Disable Datalog Not applicable to non datalog...

Page 68: ...e 4 5 2 Press the Y key to clear the peak and minimum data memory Display shows Are You Sure to re confirm whether to reset peak and minimum data 3 Press the Y key again will reset peak and minimum data 4 Press the N or MODE key to exit without resetting the data and move to next datalog sub menu Note STEL and TWA or AVG value will not be affected when peak and minimum values are reset ...

Page 69: ... run time values which are stored in the regular data memory 1 Clear All Data is the second sub menu item in Table 4 5 2 Press the Y key to clear the data memory Display shows Are You Sure to re confirm the clearing of memory 3 Press the Y key again will erase all the data memory 4 Press the N or MODE key to exit without clearing the data memory and move to next datalog sub menu ...

Page 70: ... value and press the MODE key momentarily to advance to the next digit The flashing digit will move to the next digit to the right Repeat this process until all 4 digits of the new period are entered Press and hold the MODE key for 1 second to exit data entry mode 4 If there is any change to the existing value the display will show Save Press the Y key to accept the new value Press the N key to di...

Page 71: ... Y key to accept the currently displayed data type Press N key to change to the other data type Data Type Peak Press MODE key to exit this sub menu and move on to the next sub menu 4 If there is any change to the existing selection pressing the y key the display will show Save Then press the Y key to accept or the N key to discard and move to the next sub menu Note It is necessary to select Averag...

Page 72: ...he data number and time stamp for 2 seconds followed by the stored data of each sensor Data 0 8 20 00 1 0 0 0 2 20 5 3 Press the Y or N key to move forward or backward to view other data of this event When reaching the beginning or the end of the event the message Start of data or End of data will appear Press MODE key to exit the current event 4 Press N key at Step 2 to see next event If there is...

Page 73: ...ed with an next to the sensor name The cursor is blinking at the first sensor location Press Y key to enable the datalogging for the sensor and N key to disable the datalogging CO SO2 H2S LEL pick OXY 3 Press MODE key momentarily to move from one sensor location to the next one Repeat Step 2 until all the sensors that needed to be datalogged are selected Press and hold MODE key for 1 second to sav...

Page 74: ...er user information for the VRAE monitor Table 4 6 shows the sub menus for changing the monitor Table 4 6 Monitor Setup Sub Menu Change Site ID Change User ID Change Alarm Mode Change User Mode Change Real Time Clock Change Backlight Mode Change Password Change Pump Speed Change Averaging Method Set Temperature Unit ...

Page 75: ...xxxxxx with the left most digit flashing 3 Press the Y or N key to cycle through all 26 letters and 10 numerals Press MODE key momentarily to advance to the next digit The flashing digit will move to the next digit to the right Repeat this process until all 8 digits of the new site ID are entered 4 Press and hold the MODE key for 1 second to exit the data entry mode and move to the next monitor se...

Page 76: ...hows the current alarm mode selection Alarm Mode Latched 3 Press the Y key to accept the currently displayed alarm mode Press N key to change to the other alarm mode Alarm Mode Auto reset Press MODE key to exit this sub menu and move to the next monitor setup sub menu 4 If there is any change to the existing selection pressing the Y key the display will show Save Then press the Y key to accept or ...

Page 77: ...nu and move to the next monitor setup sub menu 4 If there is any change to the existing selection pressing the Y key the display will show Disable Program Are you Sure Then press the Y key to accept or the N key to discard and move to the next sub menu Caution If the user mode is changed to display mode the user can no longer enter the programming menu Therefore the user cannot change the user mod...

Page 78: ...the left most digit of the date flashing 3 To modify this value use the Y or N key to change the digit value and press the MODE key momentarily to advance to the next digit The flashing digit will move on to next digit to its right Repeat this process until the new date and time values are entered Press and hold the MODE key for 1 second to exit data entry mode 4 If there is any change to the exis...

Page 79: ...ge Backlight Mode 2 Press Y key the display shows the current back light mode Back Light Mode Auto turn on 3 Press the Y key to accept the currently displayed back light mode Press N key to change to the other back light mode Back Light Mode manual turn on Press MODE key to exit this sub menu and move to the next monitor setup sub menu 4 If there is any change to the existing selection pressing th...

Page 80: ...t this process until all 4 digits of the new password are entered 4 Press and hold the MODE key for 1 second to exit the data entry mode and move to the next monitor setup sub menu 5 If there is any change to the existing password the display shows Save Press the Y key to accept the new password Press the N key to discard the changes and move to the next sub menu 6 The monitor next asks for this v...

Page 81: ... required Low may also be used to prolong pump motor life LEL sensor life and battery run time Note that this screen may not be present for diffusion models or if speed control is not available 1 Change Pump Motor Speed is the eighth sub menu item in Table 4 6 2 Press the Y key the display shows the current pump speed selection Pump Speed Low 3 Press the Y key to accept the currently displayed pum...

Page 82: ...show on the LCD display wherever the average is indicated 1 Change Averaging Method is the ninth sub menu item in Table 4 6 2 Press the Y key the display shows the current average selection Average Type TWA 3 Press the Y key to accept the currently displayed type Press N to change to the other selection Average Type Running Average and Y to accept the selection 4 If there is any change to the exis...

Page 83: ...ss the Y key the display shows the current temperature unit selection Temp Unit Fahrenheit 6 Press the Y key to accept the currently displayed type or press N to change to the other selection Temp Unit Celsius and Y to accept the selection 7 If there is any change to the existing selection pressing the Y key the display will show Save Then press the Y key to accept or the N key to discard and move...

Page 84: ... Ratio Change LEL VOL Gas Selection Note This menu is applicable only if a combination LEL VOL sensor is installed Before these sub menus are described the term Correction Factor CF needs to be explained Correction Factor The LEL sensor used in VRAE is a broad band sensor i e it responds to a broad range of gases Typically these sensors show a different sensitivity to different gases The correctio...

Page 85: ...r can choose methane as the calibration gas for the LEL sensor and select pentane as the measurement gas The VRAE monitor will calculate the correction factor between these two gases and convert the measured value of the LEL sensor into equivalent concentration of the pentane gas Note 1 Using the correction factor can provide a rough estimate the target measurement gas In order to achieve the spec...

Page 86: ...L However this auto ranging feature only works for gases listed in the built in library The user can select one of these sensor modes from the programming menu 1 Change LEL VOL Sensor Type is the first sub menu item in Table 4 7 2 Press the Y key the display shows the question Switch to LEL 3 Press the Y key to accept the currently displayed sensor mode Press N key to change to the other mode Pres...

Page 87: ...next to the sensor name The cursor will blink at the first sensor location Press Y key to enable the sensor and N key to disable the sensor A previously disabled sensor will show instead of the sensor name CO SO2 H2S LEL pick OXY 3 Press MODE key momentarily to move from one sensor location to the next one Repeat Step 2 until all the sensors that needed to be enabled are selected Press and hold MO...

Page 88: ...play shows New Ratio xx 1 10 with the left most digit flashing 3 Press the Y or N key to increase or decrease the value of the digit Press MODE key momentarily to advance to the next digit The flashing digit will move to the next digit to the right Repeat this process until both digits of the new dilution ratio are entered 4 Press and hold the MODE key for 1 second to exit the data entry mode and ...

Page 89: ...but selecting the measurement gas type in this mode ensures switching between LEL and VOL at the correct volume concentration equivalent to 100 LEL For VOL measurements the calibration and measurement gas must be the same and the factor is always 1 0 1 Change LEL Gas Selection is the fourth sub menu item in Table 4 7 2 Press Y key If an LEL sensor is installed and enabled or a combination LEL VOL ...

Page 90: ... Appendix B or Technical Note 156 for the proper correction factor Note that the factors are not the same in the LEL only and LEL TC sensors 7 If the user does not want to modify the LEL correction factor press Y and go to Step 8 To modify this factor press N first Then starting from the left most digit use the Y or N key to change the digit value and press MODE momentarily to advance to the next ...

Page 91: ...Table 4 1 press the MODE key once Display shows an instantaneous reading of normal operation mode 2 To exit programming mode from 2nd tier sub menu level see Table 4 2 4 6 press the MODE key twice 3 To return to programming mode press and hold down both the MODE and N keys for 3 seconds as described in Section 4 4 ...

Page 92: ...the VRAE monitor Collected data can also be extracted from the VRAE monitor to the PC in order to perform data analysis report generation or record keeping Installation and operation of this software package is described in the following sections Note Please note that the figures and functions shown in this section are from the model PGM 7800 For the model PGM 7840 the basics are the same as the P...

Page 93: ...tte is in disk drive A type A Setup exe in the Open field as shown in Figure 5 1 Figure 5 1 Run Dialog Box Press the Enter key on the keyboard or click the OK button on the menu to start the setup process If the user choose the default settings in every steps of the process the ProRAE Suite software package will be installed under the default directory C Program Files RAE Systems Inc ProRAE Suite ...

Page 94: ...ProRAE Suite menu item to display the ProRAE Suite submenu There are two submenu items under the ProRAE Suite submenu ProRAE Suite and Readme as shown in Figure 5 2 Click the ProRAE Suite submenu item to start the ProRAE Suite software Figure 5 2 Start Menu ...

Page 95: ...ess Y key to confirm and the display shows Ready to indicate that the VRAE monitor is ready for communication with PC During the communication session the PC will directly control the VRAE monitor through the serial link There is no need to press any key on the VRAE monitor during the communication session Note Do not connect to the parallel port of the PC by mistake The parallel port is usually a...

Page 96: ... main window of the ProRAE Suite software Figure 5 3 ProRAE Suite Main Window The functions of ProRAE Suite software can be divided into three categories 1 Configuration data category This category includes editing the configuration data file sending the configuration data to the VRAE monitor and receiving the configuration data from the VRAE monitor etc 2 Logged data category This category includ...

Page 97: ... VRAE monitor There is a tool bar beneath the menu bar The frequently used functions are represented in this tool bar in the form of a small icon For example the Receive data function in the Communication sub menu is represented as a small arrow with the letters RECV When the mouse cursor a small arrow is positioned near each icon in the tool bar a short text will also appear at the bottom of the ...

Page 98: ...oose the appropriate port according to the PC s serial port setup Figure 5 4 Setup Port Dialog Note In most PC s there are two serial ports Make sure the serial port selected in the Setup Port dialog box matches the actual serial port connected to the VRAE monitor The default serial port for ProRAE Suite is COM1 If a incorrect serial port is selected a message will appear indicating that no acknow...

Page 99: ...ion Data The ProRAE Suite software allows the user to edit the configuration data send the configuration data to the VRAE monitor and receive the configuration data from the VRAE monitor The following subsections describe the detail of each operation ...

Page 100: ...tton a dialog box appears Select the Files of type to be CFG as shown in Figure 5 5 Figure 5 5 Open Dialog Box There should be one or more configuration files in the file list Each configuration file has a file extension of CFG There is one generic VRAE configuration supplied with ProRAE Suite software Default_VRAE7800_V CFG where is the version number of the default configuration file ...

Page 101: ...y or click the OK button on the dialog box Once the configuration file is open the configuration data is displayed in the newly opened client window as shown in Figure 5 6 Figure 5 6 Displayed Configuration Data To edit the opened configuration data file click the Edit Configuration menu item or the Configuration toolbar button to open the Edit Configuration File dialog box as shown in Figure 5 7 ...

Page 102: ...he front then change the configuration setting on that tab page When finished editing the configuration settings click the OK button to close the Edit Configuration File dialog box The new values of the configuration settings will be reflected in the client window The General tab page shown in Figure 5 8 allows the user to change the general settings of the configuration data The following is the ...

Page 103: ...ls of security They are used to provide protection against unauthorized changes to monitor settings through the programming menu of the VRAE Level 0 allows the user to enter the programming menu without password checking but does not allow changes to alarm limits real time clock correction factor or user and site information etc The user can still perform calibrations If Level 1 is selected a four...

Page 104: ...veral readings in the normal operation but cannot enter the programming menu In the Program mode the user can enter the programming mode to calibrate the monitor or change various settings in the monitor Warm up Time This option allows the user to choose the warm up time of the instrument in seconds Comfort Beep This option allows the user to specify a time interval that the buzzer will beep once ...

Page 105: ...user can choose to record the average or peak Max reading of all the sensors during each datalog period Datalog Interval The datalog interval is the rate at which datalog samples are recorded while the datalog is running The unit of datalog interval is second The datalog interval determines how often a new sample is calculated and stored to the datalog Datalog Selection The user can choose one or ...

Page 106: ...l start stop mode for datalogging is chosen the user needs to specify a maximum run time After the monitor has been on for the specified run time datalogging will be turned off automatically Start Time and Stop Time If scheduled start stop mode is chosen for datalogging all entry boxes must be completed for start and stop year month day hour and minute The monitor must already be turned on Then on...

Page 107: ...ppm This is the place where the user can specify the STEL alarm level ppm TWA alarm level ppm low alarm level ppm and high alarm level ppm for Tox1 sensor Tox2 Alarm Levels ppm This is the place where the user can specify the STEL alarm level ppm TWA alarm level ppm low alarm level ppm and high alarm level ppm for Tox2 sensor Tox3 Alarm Levels ppm ...

Page 108: ...evel and high alarm level for LEL sensor VOL Alarm Levels This is the place where the user can specify the low alarm level and high alarm level for VOL sensor Alarm mode If Auto Set Auto reset is chosen the alarm will stop as soon as the alarm condition goes away The alarm will remain on if the Latched option is chosen To turn off a latched alarm press Y key to acknowledge the alarm condition Powe...

Page 109: ...of each field in the Gas Selection tab page of the Edit Configuration File dialog box Figure 5 10 Gas Selection Settings Tab Page LEL Current Gas selection This is the place where the user can choose a set of gases for correction factors of the LEL sensor The user can choose one gas from the Calibration Gas list box for calibration and another gas from the Measurement Gas list box for measurement ...

Page 110: ...changes Figure 5 11 shows the Other tab page This page contains two features Power On Messaging and On line Printing Figure 5 11 The Other Tab Page Power On Message It is a feature that allows the user to display any custom message up 16 characters when powering up the gas monitor For example the user can enter the name of the company which own the gas monitor The default message stored inside eve...

Page 111: ...erial printer This feature allows the user to retain a hard copy of the instantaneous reading To utilize the printer option the user must first enable the On line printing Once the On line printing is enabled a new sub menu item will appear in the user mode see Section 2 4 for more details ...

Page 112: ...king sure that the instrument is connected to the PC click the OK button to start the data transfer After the configuration information is sent successfully a message box will appear to indicate that the sending configuration process is completed Click the OK button to close the message box If the communication is not successful an error message indicating that there is no response from the instru...

Page 113: ...ument is connected to the PC click the OK button to start the data transfer After the data transfer is finished a new client window is opened with the newly received configuration data displayed In order to save the configuration information for future use user can click File Save or File Save As menu item to save the newly received configuration data to a file Once the configuration file is saved...

Page 114: ...se all the old configuration settings instrument If the user does not want this to happen clicks the Cancel button otherwise click the OK button to start the data transfer After the information is sent successfully a message box will appear to indicate that the sending configuration process is completed Click the OK button to close the message box Note The Config All option is mainly used to resto...

Page 115: ...he ProRAE Suite software allows the user to retrieve the logged data from the VRAE monitor and display the data in many different formats The user can also export the displayed text to a tab delimited text file so that Microsoft Excel can read it directly ...

Page 116: ...mind the user to connect the instrument to the PC through the serial port After making sure the instrument is connected to the PC click the OK button to start the data transfer After the data transfer is finished a new client window is opened with the newly received logged data displayed In order to save the logged data for future use the user can click File Save or File Save As menu item to save ...

Page 117: ...the display format of each event and the right pane displays the information according to the display format and the event the user selected on the left pane To select any display format of any event the user can simply click the format item on the left pane To view the next event or the previous event the user can click the Next Event double right arrow or the Previous Event double left arrow too...

Page 118: ...ane is not big enough To view the data points of a specific event the user can click the item representing that event under the item Data Text Mode For example click the item Event 1 on the left pane the right pane displays the data points of event 1 as shown in Figure 5 12 ...

Page 119: ...e STEL TWA or AVG value of any event click the event number item under the tree item STEL TWA AVG in the left pane the right pane displays the STEL TWA and AVG value of each data point of that event as shown in Figure 5 13 Figure 5 13 STEL TWA AVG of the Logged Data ...

Page 120: ...formation of any event such as peak data value and minimum data value click the event number item under the tree item Summary in the left pane the right pane displays the summary information of that event as shown in Figure 5 14 Figure 5 14 Summary Information of the Logged Data ...

Page 121: ...e The user can choose the type of sensor data in the Graph Type tab page of the Graph Settings dialog box To display the Graph Settings dialog box click any place in the right pane so that pane has the focus then click Option Graph Settings menu item to display the Graph Settings dialog box Figure 5 16 shows the Graph Type tab page of the Graph Settings dialog box This is the place where the user ...

Page 122: ...u item to display the Graph Settings dialog box To bring the Graph Range tab page the user can simply click the page header of the Graph Range tab page Figure 5 17 shows the Graph Range tab page of the Graph Settings dialog box This is the place where the user can choose the graph range on the x axis and y axis To choose the range of Y axis the user first click the User Defined radio button in the...

Page 123: ... on y axis To choose the range of X axis the user first click the User Defined radio button in the X Axis Data Time Range group box then specify the start time fields in the Start Time X axis group box and the end time fields in the End Time X axis group box If the user select the Default radio button in the X Axis Data Time Range group box the ProRAE Suite will scale the range of X axis by itself...

Page 124: ...xt displayed in the right pane to a tab delimited text file click Option Export Text menu item a Save As dialog box is displayed Specify the file name in the File name field then click the OK button to close the Save As dialog box A new file is created and Microsoft Excel can read this file directly Appendix C shows a detailed step by step instruction on how to export data as text file and use Mic...

Page 125: ...dows bitmap or metafile file first click any place in the right pane to make sure that the graph pane has the focus then click Option Export Graph menu item to display a Save As dialog box Select the export graph file type bmp or wmf in the Save as type field then specify the export file name in the File name field Click the OK button to close the Save As dialog box The newly created graph file co...

Page 126: ...f the text or graphic data report First click any place in the right pane to set the focus on that pane then select File Print menu item or click the Print toolbar button a printer to print the graph or text data A printer setup dialog box will appear before the printing starts so that the paper size orientation printer type etc can be configured correctly ...

Page 127: ...s shown in Figure 5 18 Figure 5 18 Main Window of ProRAE Suite Click Option Enable Datalog menu item a message box will appear to remind the user to connect the instrument to the PC through the serial port After making sure that the VRAE monitor is connected to the PC click the OK button to start After the ProRAE Suite software makes successful contact to the instrument connected to the PC a dialo...

Page 128: ...the OK button to close the dialog box After the datalog option is changed a message box will appear on the screen to let the user know that the datalog option is successfully changed Note Each VRAE with datalogging function should be shipped with a 3 digit authorization code If the code is missing call the factory s Customer Service Department to obtain the code If the unit is being upgraded from ...

Page 129: ... a message box will appear to remind the user to connect the instrument to the PC through the serial port After making sure that the instrument is connected to the PC click the OK button An Open file dialog box is displayed as shown on Figure 5 20 Select the firmware file a07 that is going to be loaded into the instrument click the OK button to start the loading process After the firmware loading ...

Page 130: ...an be installed in the monitor to measure inorganic toxic gases Many different type of toxic sensors are offered They can be plugged into these three sensor sockets and are interchangeable An electrochemical sensor is used to measure oxygen concentration in PGM 7800 model Figure 6 1 Block Diagram of VRAE PGM 7800 Monitor The five sensors are mounted next to the gas inlet probe A diaphragm pump is ...

Page 131: ...face between the monitor and the serial port of a PC A 2 line by 16 character LCD display is used to show the readings The user interacts with the monitor through three keys on the front panel keypad The monitor is powered by a rechargeable NiMH battery or an alkaline pack for portability NOTE The printed circuit board of the monitor is connected to the battery pack even if the power is turned off...

Page 132: ...MAINTENANCE 7 1 7 MAINTENANCE As shown in Figure 7 1 the major maintenance items of VRAE are Battery pack Sensor modules Sampling pump Figure 7 1 Main Components of VRAE ...

Page 133: ...ld work A fully charged battery powers a VRAE monitor for up to 10 hours of continuous operation The charging time is less than 10 hours for a fully discharged battery The built in charging circuit is controlled by two step constant voltage constant current charging to prevent over charging WARNING To reduce the risk of ignition of hazardous atmospheres recharge battery only in area known to be no...

Page 134: ...contacts on the battery pack matches with the battery pins inside the compartment 5 Close the battery cover and tighten the screws Replacing Alkaline Battery Adapter 1 Insert four fresh AA size alkaline batteries into the alkaline battery adapter Make sure that the polarity of the battery is correct 2 Follow the same procedure as described above to replace the battery adapter Note The internal cha...

Page 135: ...n date of each sensor The user should replace the sensor when the current date exceeds the expiration date of a sensor Sensor Replacement Procedure The oxygen and combustible sensor each has its unique sensor sockets in the VRAE monitor The three toxic sensor sockets in the VRAE monitor allow the users to plug in any three sensors selected from the series of toxic sensors offered by RAE Systems In...

Page 136: ...e gas piping cover and tighten the four screws to hold down the sensors Replace the battery pack and the monitor cover 8 Turn on the power of the VRAE The microprocessor will automatically recognize the sensors installed and configure the monitor accordingly Special Bias Voltage for Toxic Sensor The NO and NH3 toxic sensors require a special 300 mV bias voltage to operate There is a dip switch loc...

Page 137: ... pack carefully unscrew four No 2 screws that hold down the gas piping plate to the PCB and sensors Remove the gas piping plate 3 Pull loose the connector of the pump wire Unscrew the two screws that hold the pump assembly to the PCB Disconnect the Tygon tubing that connects the pump to the gas inlet port 4 Replace a new pump assembly Connect the Tygon tubing to the gas inlet port Connect the pump...

Page 138: ...r in diagnostic mode and using the troubleshooting table in Section 8 2 the user can usually narrow the problem down to one or two areas and correct the problem without having to return the monitor for repair WARNING The diagnostic mode allows the user to set several low level parameters that are very critical to the operation of the monitor Extra care should be taken when setting these low level ...

Page 139: ...ed delay release both keys the monitor will now go through the normal start up display sequence and display a Diagnostic mode message At the end of the special mode start up the display will show 1 to 5 numbers with a message Raw These numbers are raw sensor readings without calibration Other critical parameters of the monitor are available as shown in Table 8 1 They can be reached by pressing the...

Page 140: ...d temperature MODE Show LEL OXY sensor expiration date MODE Show TOX1 TOX2 sensor expiration date MODE Show TOX3 sensor expiration date MODE Adjust pump stall threshold MODE Adjust back light on off threshold MODE Show serial number and toggle pump speed MODE Begin battery deep discharge MODE Show battery duration time MODE Communicate with PC Below is a brief description of each diagnostic displa...

Page 141: ...crease or decrease If the reading of the corresponding sensor does not change when the specific gas is applied then the sensor may be defective 165 160 173 2051 RAW 1079 2 Sensor Name All the toxic oxygen and LEL sensors have a non volatile memory which contains the sensor identification and other vital information such as manufacturing date expected operating life etc If a sensor is programmed an...

Page 142: ...ding of the LEL or a combination of LEL VOL sensor The top display shows the mode of the combustible sensor The bottom line shows the instantaneous reading of raw counts from the LEL or VOL sensor By pressing N key the sensor mode can be switched from LEL to VOL and vice versa If a standard LEL sensor is installed press N key will toggle on and off the LEL sensor 6 Show Clock Battery and Temperatu...

Page 143: ...e pump stall threshold 1 The maximum and average pump current is displayed on the first row Pump xxx zzz The current pump stall value is displayed on the second row Stall yyy The typical maximum and average pump current without any blockage should be between 8 10 The typical stall value should be higher than the un blocked pump current by at least 8 10 counts 2 The user can block the gas inlet and...

Page 144: ...r with a finger and watch the light sensor reading The light reading should drop to less than 100 Determine the ambient light level when the back light should be turned on and record the light sensor reading 3 Use Y or N key to increase or decrease the trigger value until it is about the same as the previously recorded light sensor reading Press MODE key to exit this display If the threshold value...

Page 145: ...ging again To start the deep discharge First connect the charger and select Y key to enter the deep discharge mode and answer with Y key when asked to confirm The unit will turn off charger current and draw its maximum current until the battery voltage reaches 4 0 volts With the charger connected a charge cycle will then begin 12 Display Battery Duration Time This display shows the run time of the...

Page 146: ...tive battery Microcomputer hang up Solutions Charge or replace battery Disconnect then connect battery to reset computer No LED or LCD back light Reasons Defective LED or LCD back light Solutions Call authorized service center Lost password Solutions Use default configuration to reset password Buzzer inoperative Reasons Bad buzzer Solutions Call authorized service center ...

Page 147: ...Reasons Battery fuse blown or wrong AC adapter Solutions Check battery and adapter Excessive pump noise or no inlet air pressure Reasons Leaky inlet path Defective pump Solutions Check inlet connection Replace a new lamp Read a small background value Reasons There is actually a small background gas level Sensor zero drift Solutions Do fresh air calibration See Section 4 4 1 ...

Page 148: ...rect gas calibration Low sensitivity to cal gas Solutions Calibrate the sensor Use different cal gas Can not turn off monitor or corrupted characters in LCD display Reasons Microprocessor hang up Solutions Disconnect and re connect battery to reset computer Call authorized service center Calibration error message Reasons No standard gas input Low sensitivity to cal gas Solutions Make sure standard...

Page 149: ...rm M Display Sensor names M Display Peak values M Display Minimum values M Display STEL values M Display TWA values M Display Battery voltage M Display Clock Run time Internal temperature M Configured for Manual datalog yes Start Stop Datalog Y Start or Stop Datalog N Display Datalog mode M Display LEL VOL gas name if sensor is present M Display Pump Speed N Change speed M LEL VOL Mode Selection M...

Page 150: ... Alarm Limits Change High Alarm limit Change Low Alarm limit Change STEL Alarm limit Change Average Alarm limit View or Change Datalog Reset Peak and Minimum Clear All Data Change Datalog Period Select Data Type View Datalog Enable Disable Datalog Change Monitor Setup Change Site ID Change User ID Change Alarm Mode Change User Mode Change Real Time Clock Change Backlight Mode Change Password Chang...

Page 151: ...APPENDIX A A 3 Change LEL VOL Sensor Type Enable Disable Sensor Change Dilution Ratio Change LEL VOL Gas Selection N Y Mode N ...

Page 152: ...hyde 1 8 4 Acetic acid 3 4 4 Acetone 2 2 4 0 2 5 Ammonia 0 79 15 Benzene 2 1 4 3 1 2 Butadiene 1 3 2 5 2 Butane n 2 0 1 9 Carbon disulfide 3 6 5 5 1 3 Carbon monoxide 1 2 12 5 Cyclohexane 2 5 1 3 Dichloromethane 1 0 13 Ethanol 1 7 3 3 Ethene 1 5 2 7 Ethyl acetate 2 2 3 8 2 Ethyl benzene 2 8 0 8 Ethyl ether 2 3 1 9 Gasoline whole 2 1 3 0 1 3 Heptane n 2 4 3 9 1 1 Hexane n 2 3 4 3 1 1 Hydrogen 1 2 1...

Page 153: ... higher concentration level or different temperature The factors are to be multiplied by the reading to obtain the actual concentration or LEL of the gas when the monitor is calibrated to a known LEL of methane If the correction factor of a gas is 1 0 then the sensitivity to the gas is higher than that of methane Note The LEL CF is different when using the LEL only sensor compared to the LEL TC se...

Page 154: ...rt the data file into Excel and to facilitate easier data manipulation the following procedure may be followed 1 Export the event data to a tab delimited text file as described in Section 5 6 6 Export the displayed data to a text file Assume we have just export the event data to a file called TextEvent txt in C To convert that file to a MS Excel file open the MS Excel software as shown in Figure C...

Page 155: ... of type as Text Files Click to select the file TextEvent txt as shown in Figure C 2 Figure C 2 Open Dialog Box 2 Click OK button a Text Import Wizard dialog box is open as shown in Figure C 3 Figure C 3 Text Import Wizard Dialog Box ...

Page 156: ...ve the loaded event data to a MS Excel file Ensure that in the Save As dialog box the Save as type is Microsoft Excel Workbook Graphing VRAE Data in Excel 1 Open the Excel data file that contains the data to be graphed by selecting File and then Open Highlight the columns that contain the data points Make sure that the header information is not highlighted 2 Go to the Insert menu and under chart e...

Page 157: ... ChartWizard will appear In the Range area the cells that were highlighted on the chart will be denoted Press the Next button to continue 4 The next step will show the different chart types For this example the Line chart has been selected ...

Page 158: ...onal choices for the line chart including data markers and gridlines In this example number 4 has been selected so there will be markers and gridlines Press the Next button to continue 6 The next step shows a preview of the chart This will ensure that the correct columns were chosen in the ...

Page 159: ...s where the chart title and axis titles may be added After these are added in the spaces provided press the Finish button 8 A sample of a finished chart is shown on next page For additional information and other modifications that can be made to the Excel chart please refer to the Excel instruction manual ...

Page 160: ...tion Procedures for ModuRAE PDM 10A p TN 114 ToxiRAE Sensor Specifications p TN 115 ToxiRAE Toxic Gas Monitor PGM 35 at a Glance p TN 116 ToxiRAE Oxygen Monitor PGM 36 at a Glance p TN 117 ToxiRAE Combustible Gas Monitor PGM 37 at a Glance p TN 118 Use of RAE PIDs for Soil Headspace Measurements p TN 119 Calculation of STEL TWA Min Max and Average Values for ToxiRAE PID p TN 120 Measuring Correcti...

Page 161: ...35 UltraRAE Firmware and Tube Data Upgrade Procedures p TN 136 UltraRAE Operations Tips p TN 137 Exiting Diagnostic Mode for ToxiRAE LEL p TN 138 RAE System Year 2000 Compliance p TN 139 UltraRAE Communication with NT p TN 140 Extension Tubing Volume and Delay Time p TN 141 MultiRAE Remote Control Functions p TN 142 MiniRAE 2000 Preprogrammed Compound Library p TN 143 Accuracy Comparisons of Gas D...

Page 162: ...rrection Factors p TN 155 2 Year Oxygen Sensor Installation and Calibration p TN 156 Correction Factors for Combustible Gas LEL Sensors p TN 157 Moisture Exchange Tubes for Humidity Control of Test Gases p TN 158 Conversion of PID Readings to Methane Equivalent Response p TN 159 Nerve Agent Measurements by PID p TN 160 Upgrading MultiRAE QRAE Ni Cd Battery Pack See Appendix F on how to obtain Tech...

Page 163: ...E Instrument User List p AP 211 PIDs for Continuous Monitoring of VOCs p AP 212 PIDs for Indoor Air Quality p AP 213 ModuRAE PID Configuration and Applications p AP 214 Environmental Applications for PIDs p AP 215 Gas Detection in the Marine Industry p AP 216 Weapons of Mass Destruction p AP 217 Confined Spaces in the Construction Industry p AP 218 Lengthening the Interval Between Calibration Chec...

Page 164: ... to Attn Literature Department 1 408 752 0724 FAX Please send me the following information Name Company Mailing Address City State Zip Country Telephone Fax Technical Notes just list TN Application Notes just list AP Comments Thank you RAE Systems Sales Marketing Department ...

Page 165: ...btain the following information in full Name Company Shipping Address City State Zip Telephone Fax Serial number Model Reason for return Note When returning an instrument for repair please send only the monitor that needs to be worked on without any additional accessories Only send accessories with the instrument when they are also in need of repair This will help us get your equipment back to you...

Page 166: ... 0724 Toll Free Numbers Instrument Sales 877 RAE CUSTomer 723 2878 Technical Service 888 RAE 4800 723 4800 Tube Sales 888 RAE TUBE 723 8823 E mail Instrument Sales raesales raesystems com Technical Service tech raesystems com Tube Sales raetubes raesystems com World Wide Web Sites www raesystems com www raetubes com ...

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