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Rae MiniRAE 2000 PGM-7600, Operation And Maintenance Manual

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Rae MiniRAE 2000 PGM-7600 Operation And Maintenance Manual Download Page 78

THEORY OF OPERATION 

5-1

5. 

THEORY OF OPERATION 

The MiniRAE 2000 monitor uses a newly developed 
electrodeless discharge UV lamp as the high-energy photon 
source for the PID. As organic vapors pass by the lamp, they are 
photo-ionized and the ejected electrons are detected as a 
current. The PID sensor with a standard 10.6 eV lamp detects a 
broad range of organic vapors. A lamp with high photon energy 
(e.g. 11.7 eV) will measure the more kinds of compounds, 
whereas low photon energies (e.g. 9.8 eV) are selective for 
easily ionizable compounds such as aromatics. In principle, any 
compound with an ionization energy lower than that of the lamp 
photons can be measured. 

The PID sensor for the MiniRAE 2000 monitor is constructed 
as a small cavity in front of the UV lamp. A diaphragm pump 
draws the gas sample into the sensor and then pumps it out 
through the side of the instrument. 

  

Figure 5-1   MiniRAE 2000 Block Diagram 

Micro-

processor 

LCD Display 

Keypad 

Serial 

Port 

Battery 

PID Sensor 

UV lamp 

Pump 

Light 
sensor 

LED 

Buzzer 

Charger 

Sample Gas 
Inlet Probe 

Sample Gas 
Outlet

Summary of Contents for MiniRAE 2000 PGM-7600

Page 1: ...i MiniRAE 2000 Portable VOC Monitor PGM 7600 OPERATION AND MAINTENANCE MANUAL Document No 011 4001 000 Revision E May 2005 ...

Page 2: ...759X Eex ia IIC T4 B Recharge batteries only in non hazardous locations C Do not connect external cable to serial interface jack in hazardous locations D Use RAE Systems Adapter P N 500 0072 for connection to communication port and charging jack only in a non hazardous area ...

Page 3: ...2 7 Integrated Sampling Pump 2 19 2 8 Back Light 2 20 2 9 Datalogging 2 21 3 OPERATION OF ACCESSORIES 3 1 3 1 Standard Kit and Accessories 3 2 3 2 Optional Accessories 3 5 4 PROGRAMMING OF MINIRAE 2000 4 1 4 1 Programming Mode 4 2 4 2 Keys for Programming Mode 4 3 4 3 Entering into Programming Mode 4 4 4 4 Calibrate and Select Gas 4 5 4 4 1 Fresh Air Calibration 4 8 4 4 2 Span Calibration 4 9 4 4 ...

Page 4: ...4 2829 4 7 4 Change Alarm Mode 4 290 4 7 5 Change User Mode 4 301 4 7 6 Change Date 4 312 4 7 7 Change Time 4 323 4 7 8 Change Lamp 4 334 4 7 9 Change Unit 4 345 4 7 10Change Dilution Ratio 4 356 4 7 11Change Output 4 367 4 7 12Change DAC Range 4 378 4 7 13Set Temperature Unit 4 389 4 8 Exit Programming Mode 4 390 5 THEORY OF OPERATION 5 1 6 MAINTENANCE 6 1 6 1 Battery Charging and Replacement 6 2...

Page 5: ...nce with 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 7600 equipment is classified as to intrinsic safety ...

Page 6: ... After running for several minutes the residual vapor in the detector chamber will be cleared and the reading should return to zero 2 The battery of the MiniRAE 2000 monitor will 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 recommende...

Page 7: ...tested in an explosive gas air atmosphere having an oxygen concentration greater than 21 Substitution of components may impair intrinsic safety Recharge batteries only in non hazardous locations The calibration of all newly purchased RAE Systems instruments should be tested by exposing the sensor s to known concentration calibration gas before the instrument is put into service For maximum safety ...

Page 8: ...une atmosphère de gaz air explosive ayant une concentration d oxygène plus élevée que 21 La substitution de composants peut compromettre la sécurité intrinsique Ne charger les batteries que dans emplacements désignés non dangereuse La calibration de toute instruments de RAE Systems doivent être testé en exposant l instrument a une concentration de gaz connue par une procédure diétalonnage avant de...

Page 9: ... draw pump Dependable and Accurate Up to 10 hours of continuous monitoring with rechargeable battery pack Designed to continuously monitor VOC vapor at ppm levels User Friendly Preset alarm thresholds for STEL TWA low and high level peak values Audio buzzer and flashing LED display are activated when the limits are exceeded Datalogging Capabilities 15 000 point datalogging storage capacity for dat...

Page 10: ...dot matrix LCD 0 4 character height with LED back light automatically in dim light Range Resolution Response time t90 Isobutylene calibration gas 0 99 ppm 0 1 ppm 2 sec 100 1 999 ppm 1 0 ppm 2 sec 2000 10 000 ppm 1 0 ppm 2 sec Measurement Accuracy Isobutylene 0 2000 ppm 2 ppm or 10 of reading 2000 ppm 20 of reading PID Detector Easy access to lamp and sensor for cleaning and replacement Correction...

Page 11: ...icate exceeded preset limits low battery voltage or sensor failure External Alarm Optional plug in pen size vibration alarm or remote alarm Alarm Mode Latching or automatic reset Real time Clock Automatic date and time stamps on data logged information Datalogging 15 000 points with time stamp serial number user ID site ID etc Communication Upload data to PC and download instrument setup from PC t...

Page 12: ...ents and activates alarm signals whenever the exposure exceeds preset limits Prior to factory shipment the MiniRAE 2000 is preset with default alarm limits and the sensor is pre calibrated with standard calibration gas However the user should test the instrument and verify the calibration before the first use After the monitor is fully charged and calibrated it is ready for immediate operation Fig...

Page 13: ...al operation or programming of the monitor LCD display with back light for direct readout and calculated measurements Buzzer and red LED s for alarm signaling whenever the exposures exceed preset limits Wrist strap Charge contact for plugging directly to the charging station Gas entry and exit ports Serial communication port for PC interface External alarm and analog output port Protective rubber ...

Page 14: ...ough menu items N Toggle on off the back light negative acknowledge decrease value Y Start measurement positive acknowledge increase value value Pressing and holding MODE key for 5 seconds turns off the power to the monitor Monitor will beep once per second and display countdown timer during power down sequence Press MODE key momentarily to step through menu items To save time press any key during...

Page 15: ...per second during the power down sequence with a count down timer showing the number of remaining seconds The message Off flashes on the LCD display and the display will go blank indicating that the monitor is turned off Data protection during power off When the monitor is turned off all the current real time data including last measured value are erased However the datalog data is preserved in no...

Page 16: ...y and Hygiene mode The Survey mode allows the user to manually start and stop the monitoring measuring operation and display certain exposure values In the Hygiene mode the monitor runs continuously after the monitor is turned on Refer to Section 4 7 1 for switching between the two modes ...

Page 17: ...rough the start up menu Then the message Ready is displayed see figure below Ready At this point the user has two options 1 Step through the Main Menu 2 Take a measurement Press the MODE button to step through the Main Menu Press the Y button to proceed to take a measurement ...

Page 18: ...rt below to step through the Main Menu The PID sensor and pump are turned off during this time The Main Menu functions are Ready Check Site ID xxxx Gas xxxx Warm up X x ppm Stop TWA Avg x x ppm STEL x x ppm Peak x x ppm Run time hh mm Bat X XV Mm dd yy hh mm T xxxF date time and temperature C or F Log On Off PC Comm Survey ...

Page 19: ...OPERATION 2 8 These functions are arranged in a round robin order To select a specific function press the button as shown below until the desired function appears Main Menu ...

Page 20: ... will automatically return to Ready allowing the user to test the lamp again If the lamp fails a second time turn the monitor off and refer to Section 7 2 PID Sensor Lamp Cleaning Replacement Clean Sensor Quit This message displays when the sensor requires cleaning Press the Y button to turn the monitor off and clean the sensor Press the N button and the system will progress to the Site ID xx Site...

Page 21: ...ng since the start of the measurement If Y is pressed while the peak reading is displayed the unit will ask Reset Peak If Y is pressed again the peak value will be cleared and the display will return to the Ready message or instantaneous reading The peak reading is automatically reset when a new measurement is started by pressing Y from the Ready screen Run time hh mm The duration of the current m...

Page 22: ...ODE to return to Ready To communicate with a PC connect the monitor to the serial port of a PC and start the MiniRAE 2000 application software Press the Y button and the LCD displays pause monitor ok Press the Y button one more time and the display shows Comm The monitor is now ready to receive commands from the PC Survey This function displays the Current Operating Mode Survey or Hygiene Taking a...

Page 23: ...cycle After completing the Check cycle the display will show the Site ID and then the Gas selected for measurement The pump will start and the reading will be displayed The Peak and Average values will be automatically reset to zero Measurement Display and Datalog Instantaneous readings of the gas concentration in parts per million ppm are updated every second A flashing superscript L is displayed...

Page 24: ...rement is started Automatic Increment of Site ID Every time a measurement is taken the site ID will be incremented by one automatically in Survey mode Variable Alarm Signal In Survey Mode if the measurement exceeds the low alarm limit the buzzer and flashing alarm are activated and will beep flash once per second The alarms will increase in frequency as the gas concentration approaches the high al...

Page 25: ...e current monitor settings the LCD displays the instantaneous readings The Hygiene operation menu displays include Real time readings in ppm Current TWA Avg STEL and Peak values see Section 4 6 6 Run time Current battery voltage Date time and temperature Log on off Gas name PC communication Hygiene Detailed description of most of these displays are the same as Section 2 4 1 ...

Page 26: ... key where indicated with a Y Note To get back to instantaneous reading from any of the above display press MODE key repeatedly until the XX X ppm display appears XX X ppm TWA 0 0 STEL 0 0 Run time 00 00 Bat 4 8V Peak 0 0 Hygiene PC Comm Gas XXXXXXXX Log On Off 11 18 98 11 20 T 70F Reset Peak Y Y MODE MODE MODE MODE MODE MODE MODE MODE MODE MODE ...

Page 27: ... flashing LED are activated immediately to warn the user of the alarm condition In addition the MiniRAE 2000 will alarm if one of the following conditions occurs battery voltage falls below a pre set voltage level 4 4 V failure of UV lamp pump stall or when the datalog memory is full When the low battery alarm occurs there will be approximately 20 30 minutes of operating time remaining When the ba...

Page 28: ...eps flashes per seconds Pump failure 3 beeps flashes per second plus Pump message on LCD PID lamp failure 3 beeps flashes per second plus Lamp message on LCD Low battery 1 flash per second 1 beep per minute plus Bat message on LCD Memory full 1 flash per second plus Mem message on LCD Alarm Signal Testing Under normal non alarm conditions it is possible to test the MiniRAE 2000 LED and buzzer in S...

Page 29: ...larm limits are shown below Refer to Section 4 on programming procedures for selecting a different gas perform a calibration or set new alarm limits Factory Calibration and Preset Alarm Limits Cal Gas Cal Span unit Low High TWA STEL Isobutylene 100 ppm 50 100 100 250 Hexane n 100 ppm 500 750 500 750 Xylene m 100 ppm 100 150 100 150 Benzene 5 ppm 2 5 5 2 Styrene 50 ppm 20 40 20 40 Toluene 100 ppm 5...

Page 30: ...d flow speed The pump turns on when a measurement is started and turns off when the sample is manually stopped in Survey mode or when the unit is turned off from Hygiene Mode If liquid or other objects are pulled into the inlet port filter the monitor will detect the obstruction and shut down the pump immediately The alarm will be activated and a flashing error message Pump will be also displayed ...

Page 31: ... back light will be turned off automatically after a pre programmed time out period to save power In addition 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 is turned off automatically when the ambient light exceeds the threshold level See Section 8 for instructions on how to set the light threshold leve...

Page 32: ...ff in non volatile memory so that it can be down loaded at a later time to a PC Datalogging event When Datalogging is enabled measurement readings are being saved These data are stored in groups or events A new event is created and stored each time the monitor is turned on or a configuration parameter is changed or datalogging is interrupted e g Communication with PC during Hygiene mode Informatio...

Page 33: ...SSORIES The accessories for the MiniRAE 2000 include An AC Adapter Battery Charger Alkaline battery holder Water Trap Filter Optional Accessories Dilution Fitting Calibration adapter Calibration regulator and Flow controller Organic Vapor Zeroing kit ...

Page 34: ... MiniRAE 2000 monitor It only needs a regular AC to 12 V DC adapter wall mount transformer to charge the monitor To charge the battery inside the MiniRAE 2000 monitor 1 Power off the Monitor 2 Connect the AC adapter or the optional automotive charging adapter to the DC jack on the MiniRAE 2000 monitor If the unit was off it will automatically turn on 3 The first message displayed will be Deep disc...

Page 35: ...LED will turn on for several seconds every minute to maintain the full charge A completely discharged MiniRAE 2000 monitor will be charged to full capacity within 10 hours The battery will be drained slowly even if the monitor is turned off If the monitor has not been charged for 7 10 days the battery voltage will be low The factory supplied battery is designed to last for 10 hours of normal opera...

Page 36: ... alkaline battery adapter Replace the battery compartment cover The internal charging circuit is designed to prevent damage to alkaline batteries and the charging circuit when alkaline batteries are installed inside the monitor Note The AA Alkaline battery adapter supplied by RAE Systems Inc is intrinsically safe 3 Water Trap Filter The water trap filter is made of PTFE Teflon membrane with a 0 45...

Page 37: ...rrect gas reading will be displayed when the dilution fitting is used WARNING To use a dilution fitting the user must have the monitor located in a clean atmosphere outside the confined space and use a remote access probe or Tygon tubing to measure the gas concentration inside the confined space 2 Calibration Adapter The calibration adapter for the MiniRAE 2000 is a simple 6 inch Tygon tubing with...

Page 38: ...bration process The maximum flow rate allowed by the flow controller is about 0 5L min 500 cc per min Alternatively a Demand flow Regulator or a Tedlar gas bag may be used to match the pump flow precisely 4 Organic Vapor Zeroing kit Charcoal filter The Organic Vapor Zeroing Kit is used for filtering organic air contaminants that may affect the zero calibration reading To use the Organic Vapor Zero...

Page 39: ...de programming flexibility Authorized users can re calibrate the monitor change the alarm limits change site ID user ID lamp type and real time clock etc Programming is menu driven to provide intuitive end user operation The display shows the menu options and the key pad used for menu selection and data entry ...

Page 40: ...hows a more detailed menu tree structure Programming Menu Calibrate Select Gas Change Alarm Limits Change Datalog Change Monitor Setup Once inside the programming mode the LCD will display the first menu Each subsequent menu item can be viewed by pressing the N repeatedly until the desired menu is displayed To enter the sub menu of a particular menu press Y key the sub menu will be displayed Retur...

Page 41: ...ramming mode as summarized below Key Function in Programming Mode MODE Exit menu when pressed 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 42: ...econds to enter programming mode This delay is to prevent the user from entering programming mode by accident 3 The first menu item Calibrate select Gas will be displayed 4 Release both MODE and N keys simultaneously to start the programming mode 5 Press N key to scroll to the next menu item of the programming menu Press Y key to select the displayed menu item The following Sections 4 4 4 7 descri...

Page 43: ...ser can perform functions such as calibration of the MiniRAE 2000 Monitor select default cal memories and modify cal memories see Table 4 4 Table 4 4 Calibrate Select Gas Sub Menu Fresh Air Cal Span Cal Select Cal Memory Change Span Value Modify Cal Memory Change Correction Factor Calibrating the MiniRAE 2000 monitor is a two point process using fresh air and the standard reference gas also known ...

Page 44: ...micals or to a user defined custom gas a correction factor is applied to all the readings During calibration the unit requests isobutylene gas and displays the isobutylene concentration immediately following calibration but when the unit is returned to the normal reading mode it displays the selected gas and applies the correction factor The other 7 cal memories require the same calibration gas as...

Page 45: ...he gas is changed in Memories 1 7 it is necessary to recalibrate To change a default gas from the list above to a library or custom gas first go to Select Cal Memory Section 4 4 3 and then proceed to Modify Cal Memory Section 4 4 5 to enter the desired gas If the desired compound does not appear in the preprogrammed library the user can use the Custom_VOC entry in the library or the name and corre...

Page 46: ... such an air cylinder is not available any clean ambient air without detectable contaminant or a charcoal filter can be used 1 The first sub menu shows Fresh air Cal 2 Make sure that the MiniRAE 2000 is connected to one of the fresh air sources described above 3 Press the Y key the display shows zero in progress followed by wait and a countdown timer After about 15 seconds pause the display will s...

Page 47: ...the inlet port of the MiniRAE 2000 Monitor and connect the tubing to the regulator or Tedlar bag Another alternative is to use a regulator with 500 cc min flow but allow the excess flow to escape through a T or an open tube In the latter method the span gas flows out through an open tube slightly wider than the probe and the probe is inserted into the calibration tube Before executing a span calib...

Page 48: ...ration the monitor waits for an increased signal before starting the countdown timer If a minimal response is not obtained after 35 seconds the monitor displays No Gas Check the span gas valve is on and for lamp or sensor failure before trying again 8 The calibration can be started manually by pressing any key while the Apply gas now is displayed 9 After a span calibration is completed the display...

Page 49: ...mory is the third sub menu item in the Calibration sub menu Pressing the Y key the display will show Gas gas name followed by Mem x 2 Press N to scroll through all the memory numbers and the gas selections respectively Press Y to accept the displayed Cal Memory number 3 After the Y key is pressed the display shows Save Press Y key to save and proceed Press N to discard the entry and advance to the...

Page 50: ...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 sub menu 3 Starting from the left most digit of the span gas value use the Y or N key to change the digit value and press MODE key momentarily to advance to next digit Repeat this process until all digits are entered Press and hold the MODE for 1 second to exit 4 The ...

Page 51: ... Y to accept or N for the next sub menu Enter Custom gas 3 In the Copy gas from library submenu use Y and N keys to scroll through the selections in the library Press MODE key momentarily to select the gas The display shows Save Press Y to save or N to discard the changes and proceed to next sub menu 4 In the Custom gas sub menu the user can enter the gas name Press the Y or N key to cycle through...

Page 52: ...ress and hold the MODE key for 1 second to accept the previously stored correction factor value and return to the first sub menu of the calibrate select gas menu 3 Starting from the left most digit of the correction factor use Y or N key to change the digit value and press MODE key momentarily to advance to the next digit the cursor will move to the next digit to the right Repeat this process unti...

Page 53: ...ress the Y key and the display shows the current gas selected followed by the first sub menu item below Table 4 5 Alarm Limit Sub Menu Change High Alarm limit Change Low Alarm limit Change STEL limit Change TWA limit 1 Scroll through the Alarm Limit sub menu using the N key until the display shows the desired limit to be changed e g High limit STEL limit etc ...

Page 54: ...lue and press the MODE key momentarily to advance to the next digit The flashing digit will move to the next digit to its right Repeat this process until the new limit value is 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 shows Save Press Y to accept the new value and move to the next sub menu Press N to discard...

Page 55: ... previously stored Low alarm limit 2 To modify this limit 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 to the next digit to its right Repeat this process until the new limit values is entered Press and hold the MODE key for 1 second to exit data entry mode 3 If there is any change to the existing val...

Page 56: ...se 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 limit values is entered Press and hold the MODE key for 1 second to exit data entry mode 3 If there is any change to the existing value the display shows Save Press Y to accept the new value and move...

Page 57: ... 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 limit values is entered Press and hold the MODE key for 1 second to exit data entry mode 3 If there is any change to the existing value the display shows Save Press Y to accept the new value and move to th...

Page 58: ...E 2000 monitor calculates and stores the concentration and ID of each sample taken In the datalog sub menu a user can perform the tasks and functions shown below Datalog Sub Menu Reset Peak Minimum Clear Data Change Data Period Change Average Type ...

Page 59: ...Reset Peak is the first sub menu item in the Datalog sub menu Table 4 6 2 Press the Y key to reset the Peak Minimum Values The display shows Are You Sure 3 Pressing the Y key again will reset the values The display shows Peak Minimum Cleared and moves to the next submenu 4 Press the N or MODE key to exit without resetting the values and move to the next sub menu ...

Page 60: ...n time values which are stored in the regular data memory 1 Clear Data is the third sub menu item in the Datalog sub menu 2 Press the Y key to clear the datalog memory The display shows Are you sure 3 Press the Y key again to confirm erasure of all the datalog memory 4 Press the N or MODE key to exit without clearing the datalog memory and move to the next datalog sub menu ...

Page 61: ...od 4 To modify this period starting from the left most digit 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 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 5 If there is any change to the exis...

Page 62: ... start of the measurement This value can only increase or remain constant never decrease Refer to Technical Note 119 for more information on how TWA is calculated 1 Change Average Type is the sixth sub menu in the Datalog sub menu 2 Press the Y key to enter the function 3 The display will show Running Average or Time Weighted Average depending on the current average type 4 Press N key to toggle be...

Page 63: ...tion data that can be modified by the user Monitor Setup Sub Menu Diagnostic Mode Change Operation Mode Change Site ID Change Unit ID Change User ID Change Host ID Change Alarm Mode Change User Mode Change Date Change Time Change Lamp Change Pump Duty Cycle Change Unit Change Dilution Ratio Change Output Change DAC Range Set Temperature Unit ...

Page 64: ... Op Mode current mode 3 Press the Y key to accept the currently displayed operation Op mode Press N to toggle to the other operation mode Press MODE to exit this sub menu and move to the next monitor setup sub menu 4 When changing Op mode from Hygiene to Survey the display shows the additional message Warning Exit Hygiene to prevent accidental exit from Hygiene mode Press the Y key to acknowledge ...

Page 65: ... left most digit flashing 3 Press the Y or N key to cycle through all 26 letters and 10 numerals Press MODE 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 5 If there is any change to the existing site ID t...

Page 66: ...st digit flashing 3 Press the Y or N key to cycle through all 26 letters and 10 numerals Press MODE 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 user ID are entered 4 Press and hold the MODE key for 1 second to exit the data entry mode 5 If there is any change to the existing user ID the displ...

Page 67: ...he Monitor Setup menu 2 Press the Y key the display shows the current alarm mode 3 Press the Y key to accept the currently displayed alarm mode Press N key to toggle to the other alarm mode Press MODE to exit this sub menu and move to the next monitor setup sub menu 4 If there is any change to the existing setting the display will show Save Press Y to save the change Press N or MODE to discard the...

Page 68: ...ogram change and Are you sure Press Y to confirm the change or press N or MODE to discard the changes 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 mode Therefore the user can not change the user mode back to Program mode in normal mode To restore the user mode back to Program mode turn the unit off and back on in Dia...

Page 69: ...digit of the date flashing 5 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 existing value the...

Page 70: ...fy 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 existing value the display shows Save Press Y to confi...

Page 71: ...menu Table 4 7 2 Press the Y key the display shows the current PID lamp selection 3 Press the Y key to accept the currently displayed lamp Press N key to scroll through the sub menu for other lamp selections Press MODE to exit this sub menu and return to the next sub menu in Table 4 7 4 If there is any change to the existing selection the display will show Save Press Y to save the new selection or...

Page 72: ...y to exit this sub menu 4 If there is any change to the existing selection press Y to confirm the new selection or press N or MODE to discard the changes and move to the next sub menu Caution 1 The correction factor in the gas library is calculated based on ppm unit If mg unit is selected the built in correction factor library is not valid 2 No automatic conversion between ppm and mg m3 reading is...

Page 73: ...enth sub menu item in the Monitor Setup menu 2 Press the Y key the display shows the current dilution ratio Dilution Ratio xx with the left most digit flashing 3 Press the Y or N key to increase or decrease the value of the digit Press MODE 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 ...

Page 74: ...eal time see Technical Note 141 1 Change External Output is the eleventh sub menu item in the Monitor Setup menu 2 Press the Y key and the display shows the current output option selection Output DAC 3 Press the Y key to accept the currently displayed output option Press N to change to the other external option Output Alarm Press MODE to exit this sub menu and move to the next monitor setup sub me...

Page 75: ...h sub menu item in the Monitor Setup menu 2 Press the Y key the display shows the current DAC Range value DAC Range 2000 ppm 3 Press the Y key to accept the currently displayed value Press N to scroll through the sub menu for other range values Press MODE to exit this sub menu and return to the first sub menu in Table 4 7 4 If there is any change to the existing selection press the Y key and the d...

Page 76: ...etting Temperature Unit Fahrenheit 3 Press the Y key to accept the currently displayed value Press N to select the sub menu Temperature Unit Celsius Press MODE to exit this sub menu and return to the first sub menu in Table 4 7 4 If there is any change to the existing selection press the Y key and the display will show Save Press the Y key to save the change and return to the first sub menu in Tab...

Page 77: ... To exit programming mode from the first tier menu level press the MODE key once 2 To exit programming mode from 2nd tier sub menu press the MODE key twice 3 To return to programming mode press and hold down both the MODE and N keys for 3 seconds ...

Page 78: ...re kinds of compounds whereas low photon energies e g 9 8 eV are selective for easily ionizable compounds such as aromatics In principle any compound with an ionization energy lower than that of the lamp photons can be measured The PID sensor for the MiniRAE 2000 monitor is constructed as a small cavity in front of the UV lamp A diaphragm pump draws the gas sample into the sensor and then pumps it...

Page 79: ...ata are stored in non volatile memory so that they can be sent to a PC for record keeping RS 232 transceivers provide a serial interface between the monitor and the serial port of a PC An LCD display consisting of a single row of eight alpha numeric characters is used to display the readings The user interacts with the monitor through three keys on the front panel keypad A rechargeable NiMH NiCd b...

Page 80: ...ed by qualified personnel only NOTE The printed circuit board of the monitor is connected to the battery pack even if the power is turned off Therefore it is very important to disconnect the battery pack before servicing or replacing any components inside the monitor Severe damage to the printed circuit board or battery may occur if the battery pack is not disconnected before servicing the unit ...

Page 81: ...s than 10 hours for a fully discharged battery The built in charging circuit is controlled by the micro controller to prevent over charging The battery may be replaced in the field in area known to be non hazardous if required WARNING To reduce 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 n...

Page 82: ...ry compartment Make sure the battery pack is oriented properly inside the compartment 5 Close the battery cover and tighten the two screws Replacing Alkaline Battery Adapter 1 Insert four fresh AA size alkaline batteries into the alkaline battery holder Make sure that the polarity of the batteries is correct 2 Follow the same procedure as described above to replace the battery holder Note The inte...

Page 83: ...amp and the lamp housing only when one of the following happened 1 The reading is inaccurate even after calibration 2 The reading is very sensitive to air moisture 3 A chemical liquid has been sucked into the unit and damaged the unit Use of the water trap filter will help prevent contamination and accidentally drawing liquid into the sensor Lamp Housing 1 1 8 O Ring PID Sensor Porus Metal Filter ...

Page 84: ... 15 minutes Then dry the sensor thoroughly Never touch the electrodes of the sensor by hand Also use a methanol soaked cotton swab to wipe off the lamp housing where it contacts the sensor when the sensor is installed Turn over the sensor so that the pins point up and the sensor cavity is visible Examine the sensor electrodes for any corrosion damage or bending out of alignment The metal sensor el...

Page 85: ...any remaining film Repeat the process until the lamp window is clean Never use water solutions to clean the lamp Dry the lamp and the lamp housing thoroughly after cleaning CAUTION Never touch the window surface with the fingers or anything else that may leave a film Never use acetone or aqueous solutions 2 If the lamp does not turn on remove the lamp from the lamp housing Place the lamp O ring on...

Page 86: ...sample draw capability significantly When this occurs it is necessary to replace or rebuild the pump When checking the pump flow make sure that the inlet connector is tight and the inlet tubing is in good condition Connect a flow meter to the gas inlet probe The flow rate should be above 450 cc min when there is no air leakage Figure 7 3 Sampling Pump ...

Page 87: ...o screws that hold the pump assembly to the PCB Disconnect the Tygon tubing that connects the pump to the gas inlet port and gas outlet port 4 Insert a new pump assembly Connect the Tygon tubing to the gas inlet port Plug the pump connector back into the PCB and screw down the pump assembly to the board 5 Replace the bottom cover and tighten the six screws Re connect the battery pack Replace the b...

Page 88: ... products because of the relatively small lamp size To solve this problem simply turn on and off the monitor a few times and the lamp should turn on After the UV lamp is turned on for the first time it should be easier to turn on the UV lamp next time It is possible that the UV lamp is actually on when the lamp error message appears This is because when the lamp becomes old the internal threshold ...

Page 89: ...ostic mode and by using the troubleshooting table in Section 7 2 the user can usually correct the problem without having to return the monitor for repair WARNING This function should be used by qualified personnel only 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 paramete...

Page 90: ...r mode and the mode does not support automatic turn on back light Solutions Adjust trigger level Verify the back light can be turned on in user mode Call authorized service center Lost password Solutions Call Technical Support at 1 408 752 0723 or 1 888 723 4800 Reading abnormally High Reasons Dirty sensor module Dirty water trap filter Excessive moisture and water condensation Solutions Clean sen...

Page 91: ...ak or defective PID lamp defective Solutions Turn the unit off and back on Replace UV lamp Full scale measurement in humid environment Reasons Dirty or wet sensor Solutions Clean and dry sensor and lamp housing Adjust sensor fingers to ensure not touching Teflon Use water trap filter Reading abnormally low Reasons Incorrect calibration Low sensitivity to the specific gas Weak or dirty lamp Air lea...

Page 92: ...Modify cal memory Change correction factor Change Alarm Limits High limit Low limit STEL limit TWA limit Change Datalog Reset Peak Minimum Clear data Change data period Change average type Change Monitor Setup Change Op Mode Change Site ID Change User ID Change Alarm Mode Change User Mode Change Date Change Time Change Lamp Change Pump Duty Cycle Change Unit Change Dilution Ratio Change Output Cha...

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Page 94: ...iced contact either 1 The RAE Systems distributor from whom the monitor was purchased they will return the monitor on your behalf 2 The RAE Systems Technical Service Department Before returning the monitor for service or repair obtain a Returned Material Authorization RMA number for proper tracking of your equipment This number needs to be on all documentation and posted on the outside of the box ...

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