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PureAire Monitoring Systems, Inc.

4 |

P a g e

Sample Exhaust

— This permits the flow of oxygen to exit the enclosure.

Cable strain relief

— This is the sealed opening in the transmitter housing

for connecting the input power, 4-20 mA output and relay wiring.

1.2.2 Front View with front cover removed

Sample Pump

— Used to bring in a sample to the oxygen cell. Flow rate is

preset at the factory. Flow rate is continuously protected with a built-in flow
sensor. See Section 4.2; Instrument Faults

Oxygen Sensor Assembly

— A zirconium oxide sensor, which detects and

measures the level of oxygen. When exposed to oxygen, the sensor outputs
an electrical signal proportional to the actual concentration of oxygen.

10.

Front Panel Retaining Screws

— These captive screws are used to mount

the display front panel and O

electronics to the enclosure.

NOTE:

When unfastening the front panel electronics,

apply upwards

pressure on the back of the front panel to release the captive screws.

11.

Alarm Indicators

— 3 multi colored LED indicators for showing:

Alarm level 1 Orange LED

Alarm level 2 Red LED

Fault Alarm Yellow LED

Sample
pump

Joystick

Oxygen
sensor
assembly

Retaining
Screws for
electronics
panel

Alarm Relay
LED’s

Fault

Alarm 1

Alarm 2

Содержание Air Check O2

Страница 1: ...er Resistant O2 Monitor Instruction Manual Part number 99118 PureAire Monitoring Systems Inc 1140 Ensell Road Lake Zurich Illinois 60047 Phone 847 726 6000 Fax 847 726 6051 Toll Free 888 788 8050 pureairemonitoring com ...

Страница 2: ... products and commitment to service will satisfy your specific monitoring needs now and in the future Our growth is a result of our total commitment to supporting our customers We are available 24 hours a day 7 days a week to help you when you need us Our 24 hour Emergency phone number is 1 847 420 3814 We can provide field service preventative maintenance programs and training to your technicians...

Страница 3: ...d Ex type monitors use an On Demand regulator to expose the span gas to the monitor see section 6 1 2 5 Only expose the monitor to span gas blends that consist of Oxygen and Nitrogen only Do Not expose the monitor to any combustible gas i e Methane Hydrogen etc Exposure to combustible span gases can damage the oxygen zirconium sensor cell 6 Do not expose the Oxygen monitor to silicone Freon or cor...

Страница 4: ...Maintenance Schedule 16 4 4 Loss of Power Indicator 16 4 5 Alarm Reset 16 5 Air Check O2 Monitor Programming 18 5 1 Joystick Operation 18 5 2 Program Flowchart 19 5 3 Entering the Password 23 5 4 Changing the User Password 24 5 5 Entering the Menus 27 5 5 1 Set 4 20mA Loop 27 5 5 2 Set Formats 29 5 5 3 Set Alarm Threshold Polarity 31 5 5 4 Set Latching 33 5 5 5 Resetting a Latching Alarm 36 5 5 6 ...

Страница 5: ...nels the Air Check water resistant O2 monitor does not drift or loose sensitivity when the weather or temperature changes The electronics are housed in a 4X IP65 water resistant housing capable of withstanding water projected from a nozzle Each system consists of a long life zirconium oxide sensor cell and three wire transmitter The Air Check O2 monitor may be used as a stand alone gas detector li...

Страница 6: ...dure to nitrogen 1 2 Component Identification 1 2 1 Front View Exterior 1 Front Cover This is a removable waterproof cover that protects the interior of the transmitter It fastens through 4ea captive screws 2 Joystick Used for selecting and adjusting the built in menus The Air Check O2 Sample draw monitor has dual level user selectable alarms 3 Digital Display This displays the Oxygen levels in pe...

Страница 7: ...ly A zirconium oxide sensor which detects and measures the level of oxygen When exposed to oxygen the sensor outputs an electrical signal proportional to the actual concentration of oxygen 10 Front Panel Retaining Screws These captive screws are used to mount the display front panel and O2 electronics to the enclosure NOTE When unfastening the front panel electronics apply upwards pressure on the ...

Страница 8: ...t cover removed 1 2 3 Transmitter Interior Alarm and Fault Relays Terminal blocks Relays Flow Sensor O2 Sensor connector Sample pump connector Sample Pump 1 Power Analog output Terminal Block Common Common mA output 24 VDC 24 VDC 3 PTC Resettable Fuse 2 Sensor cell connector ...

Страница 9: ...this connector while the monitor is powered This will damage the oxygen sensor 3 PTC Resettable Fuse The PCB is protected with a PTC Fuse that is resettable and Never needs to be replaced If it trips you will need to turn power off to the monitor When power resumes the fuse will reset 1 2 4 Alarm Relay Board Identification legend is located between the relay and connector Relay 2 Relay 1 Fault Rel...

Страница 10: ...conium Oxide Sensor Cell Range 0 25 Sensor Life 8 10 years under normal conditions Transmitter Microprocessor electronics with built in 3 digit backlit LCD display Joystick operated menus 2 3 Signal Outputs Local Display Digital display calibrated for Oxygen The range is stated on the model label and also can be accessed via the joystick on the front panel In the measurement mode pushing the joyst...

Страница 11: ...tching Alarm 2 Non latching Audio Non latching Do you want the alarm to automatically reset non latching or do you want to manually reset the alarm latching Alarm Delay Alarm 5 seconds How long do you want to wait until the relay alarms activate Zero Suppression 000 0 00 This function is Not Enabled on the Oxygen monitor Set Alarm Thresholds Alarm 1 19 5 Alarm 2 18 0 Audio 19 5 At what level do yo...

Страница 12: ...mounting and should be installed at a height convenient for operation maintenance and viewing of the instrument display 3 2 2 Air Check O2 monitor The transmitter and sensor should be installed in a location where gas leaks are likely to occur or where released gases may accumulate It should be mounted no closer than 12 inches above floor level Airflow within the monitored area the characteristics...

Страница 13: ...eAire Monitoring Systems Inc 10 P a g e 3 2 3 Enclosure Mounting Feet Mounting Feet Can be oriented in any direction Feet can also be removed for mounting the O2 monitor flush with a wall or other surface ...

Страница 14: ... to the monitor is continuously monitored and controlled by the flow control microprocessor NOTE If using longer lengths of sample tubing the dust water filter must be located at the end of the sample line to work properly NOTE If the sample line is blocked the fault indicator will illuminate and the pump will accelerate to try and reestablish the proper flow rate If the line is cleared the pump w...

Страница 15: ... must be oriented opposite the water flow i e orient the drain towards the back of the monitor to prevent water from building up inside the drain NOTE NEVER connect any tubing to either the inlet or drain port of the filter Sample air can enter from either port This is the reason why the water filter must be located at the end of the sample line Photo shown is a waterproof monitor located at the r...

Страница 16: ...e integrity of all wiring 2 Apply 24 VDC power to the Power Supply PCB board The sample pump will activate Also the digital display second line will quickly display the DTM digital transmitter module serial number and Software version NOTE To display the DTM numbers push the joystick to the left To display the gas and range push the joystick down and the gas and range will continuously scroll To s...

Страница 17: ...nd the 20 9 reading will display on the bottom line If the fault is still present the actual fault code will display on the bottom line The instrument should now be operating properly and is ready for monitoring NOTE The Air Check O2 monitor s reading may be adjusted to the ambient oxygen level See section 6 1 for instructions on adjusting Pump Adjustment The Air Check Sample Draw O2 monitor has a...

Страница 18: ...t condition is detected the analog output signal is altered A few common error codes are displayed in the following table Condition Analog Signal Supply Voltage Out of Range Fault code 16 Analog output drops to 2 mA Transmitter cable cut Analog output drops to 0 mA O2 Cell current fault Fault Code 128 Analog output drops to 2 mA Fault Relay activates O2 System Warm Up Analog output drops to 2 mA F...

Страница 19: ...isplay should also indicate 20 9 02 when the oxygen is at ambient levels 4 3 2 Recommended Routine Maintenance Schedule Routine Visual Checks Every 6 12 months Sensor Verification with nitrogen Every 6 12 months The ambient oxygen level is 20 9 therefore under ambient conditions visual verification of the Air Check O2 monitor to 20 9 oxygen is easily performed The O2 monitor only requires periodic...

Страница 20: ...ms Remote Reset Refer to section 1 2 4 for location on PC board The alarm relay board has a two pin connector for wiring to a remote switch When connected to a switch this remote reset will bypass the joystick and a password will not be needed to reset the alarms NOTE The oxygen levels must recover above the alarm thresholds before the horn can be reset from the remote reset switch or joystick ...

Страница 21: ... uses an 8 position joystick with a center pushbutton for selecting menus and changing values The joystick is programmed to standard protocol as follows NOTE The joystick has a built in delay to prevent accidental tampering of the menus deliberate entries are required CAUTION Only qualified personnel should perform programming maintenance and sensor verification Plus Minus Previous s Next Plus Pus...

Страница 22: ... Set 4 20mA loop Set 4mA Zero 255 Set 20mA Span 255 Oxygen 20 9 Enter Password 557 Force loop Not available Set Formats Format Relay 2 Format Relay 1 Normal Invert Normal Invert Format Fault Relay Normal Invert NOTE All numerical values shown are only examples and are not Factory Defaults ...

Страница 23: ...mal Invert Alarm Delay 005 Set Audio Alarm Polarity Not available PassCode OK Not Available Set Latching Relay 2 Set Latching Set Latching Relay 1 Nonlatch Latch Nonlatch Latch Set Latching Audio NOTE All numerical values shown are only examples and are not Factory Defaults NOTE Zero suppression function is not available for Oxygen ...

Страница 24: ...larm 19 5 Set Relay 2 Alarm 18 0 Set Audio Alarm 19 5 Set Alarm Thresholds PassCode OK Set Alarm 1 Hysteresis 0 0 Set Alarm 2 Hysteresis 0 0 Set Audio Alarm Hysteresis Alarm Hysterisis 0 0 Set Alarm Hysteresis NOTE All numerical values shown are only examples and are Not Factory Defaults NOTE Zero suppression function is not available for Oxygen ...

Страница 25: ...PureAire Monitoring Systems Inc 22 P a g e PassCode OK Manage Passwords Enter New User Password A Enable User Password Enabled Disabled Reset User Password Not Available ...

Страница 26: ...anumeric display and toggles from A through Z followed by 0 to 9 The character to be entered will flash 4 Push the joystick again to the right to select the second entry Push the joystick up or down to select the second digit The character being entered will flash and the first character entered will remain lit 5 Push the joystick again to the right to select the third entry Push the joystick up o...

Страница 27: ...the first line of the digital display 3 Push the joystick to the right to enter the input screen The letter A will appear and flash NOTE The display has characters that start with A through Z and 0 through 9 Pushing the joystick up or down will permit you to scroll through the alphanumeric characters 4 Push the joystick up or down to enter the first digit The display is an alphanumeric display and...

Страница 28: ...s an alphanumeric display and toggles from A through Z followed by 0 to 9 The character to be entered will flash 10 Push the joystick again to the right to select the second entry Push the joystick up or down to select the second digit The character being entered will flash and the first character entered will remain lit 11 Push the joystick again to the right to select the third entry Push the jo...

Страница 29: ...ivate or disable the password function on the Oxygen monitor Push the joystick down Enable User Password will scroll on the first line of the digital display Push the joystick right to display the status If enabled it will display Enabled Push the joystick up or down to change the status Once enabled or disabled is selected Push the joystick in the center to enter the new status If correctly enter...

Страница 30: ...ust either be connected to a remote PLC controller or SCADA system You can also connect the Air Check O2 monitor to a voltmeter to read the mA output Please consult PureAire for more information From this main menu pushing the joystick to the right will select the sub menu and the digital display will scroll the following This is the menu at which to adjust the 4mA output being sent from the Air C...

Страница 31: ...The 20mA output being sent from the Air Check O2 monitor will change as the number on the digital display changes Press ENTER to accept the value Push the joystick to the left brings you back to the pervious Main menu The digital display will scroll the following Push the joystick down to access the next sub menu Force loop will scroll NOTE The Force Loop function is not available on the Air Check...

Страница 32: ...ings from normally de energized state Normal to normally energized state Inverted From this main menu pushing the joystick to the right will select the sub menu and the digital display will scroll the following This is the menu at which to adjust the first level alarm relay state on the Air Check O2 Monitor To change this value push the joystick right to display the relay state The display will In...

Страница 33: ...isplay the relay state The display will Indicate INVERT Pushing the joystick down will change the relay state from INVERT to NORMAL Press ENTER to accept the value After entering the relay state the display will default back to the Set Formats menu The display will scroll the following From this main menu pushing the joystick to the right will select the sub menu and the digital display will scrol...

Страница 34: ...d the Alarm Threshold Polarity must be set to Invert for the monitors alarm to activate when the reading goes below 19 0 For toxic and corrosive gases selecting a Normal setting for the Alarm Threshold Polarity means that the system will alarm when the gas concentration exceeds goes above an alarm set point This menu will permit the selection of the alarm polarity To access this menu from the Set ...

Страница 35: ...level alarm polarity state on the Air Check O2 Monitor To change this value push the joystick right to display the relay state The display will Indicate INVERT Pushing the joystick down will change the relay state from INVERT to NORMAL Press ENTER to accept the value After entering the relay state the display will default back to the Set Relay 2 Alarm Threshold menu The display will scroll the fol...

Страница 36: ...rn to activate at the same time the relays activate In the Normal or Inverted Mode the horn immediately activates any time the alarm thresholds are exceeded To activate the horn when the relays activate choose the AUTO mode After entering the relay state the display will default back to the Set Audio Alarm Polarity menu The display will scroll the following 5 5 4 Set Latching This is the menu at w...

Страница 37: ...is the menu at which to adjust the first level alarm relay state on the Air Check O2 Monitor To change this value push the joystick right to display the relay state The display will Indicate LATCH Pushing the joystick down will change the relay state from LATCHING to NON LATCHING Press ENTER to accept the value After entering the relay state the display will default back to the Set Latching menu T...

Страница 38: ...G to NONLATCH Press ENTER to accept the value After entering the relay state the display will default back to the Set Latching menu The display will scroll the following From this main menu pushing the joystick to the right will select the sub menu and the digital display will scroll the following Push the joystick twice to select the Audio Alarm relay to be adjusted The display will scroll Set La...

Страница 39: ...monitor also has an internal 2 pin terminal block for connecting a remote reset switch See Alarm Relay board section 1 2 7 5 5 6 Set Alarm Delay Push the joystick down to access the next main menu Alarm Delay The display will scroll the following This is the amount of time an alarm level concentration of oxygen must be present before the instrument s gas concentration alarm s will be activated Thi...

Страница 40: ... 8 Set Alarm Thresholds This main menu will permit adjusting the oxygen concentration percentage that will activate alarm levels 1 and 2 If the Audio alarm output module is installed it will also permit setting the level at which the audio alarm will activate NOTE To activate the audio alarm the AirCheck O2 monitor must have the audio alarm option From this main menu pushing the joystick to the ri...

Страница 41: ...ay will indicate a value between 00 0 and 25 5 Pushing the joystick up increases the value and pushing the joystick down decreases the value Press ENTER to accept the value After entering the relay state the display will default back to the Set Relay 2 Alarm Threshold Menu The display will scroll the following Push the joystick down to access the next sub menu Set Audio Alarm Threshold will scroll...

Страница 42: ... a desired concentration of Oxygen When using hysteresis the alarm set point now becomes an average alarm setting for an action to occur When adding the hysterisis value to the alarm set point this then defines the alarm and dead band for an action to occur For example if you require a valve to close at 14 9 oxygen level and to reopen again at 15 5 oxygen level you will set the Alarm Threshold at ...

Страница 43: ...a value 0 0 Pushing the joystick up increases the percentage up to a maximum value of 2 5 Adjust the digital display until the desired hysterisis value is selected 5 5 10 Set Sensor Adjust This menu will permit fine tuning of the oxygen readout to a known concentration of Oxygen It is recommended to adjust the oxygen display to ambient oxygen levels of 20 9 To access this menu push the joystick do...

Страница 44: ... 9 0 1 is displayed The actual oxygen reading will fluctuate from 20 8 to 21 0 Press ENTER to accept this value The digital display will revert to Set Sensor Span Press the joystick to the left to revert to the Sensor Adjustment menu NOTE The Set Module Zero menu is not available for the Oxygen monitor This menu was designed for PureAire toxic and corrosive gas monitors When selected nothing will ...

Страница 45: ...r PureAire recommends the use of nitrogen This can be purchased from your gas supplier or from the gas supplier listed below 6 1 2 Sensor Verification Equipment For exposing the monitor to a known span gas use the following The gas and regulator are available by separate order directly from your gas supplier This can be purchased from your gas supplier or from the gas supplier listed below Part Nu...

Страница 46: ...nsor Adjustment menu This will scroll on the digital display NOTE It is recommended to warm up the Air Check Oxygen monitor For one hour before making any adjustments to the sensor Push the joystick right to access the first sub menu Set Sensor Span will scroll on the display This is the menu that will permit fine adjustment of the ambient oxygen reading to 20 9 Push the joystick right to access t...

Страница 47: ...ale tube fitting designed for connecting sample tubing from a Nitrogen cylinder Expose the O2 cell to N2 using the On Demand regulator The reading will drop off to 1 or below in less than one minute when the O2 sensor is exposed to pure N2 The system will recover to 20 9 when the nitrogen is removed NOTE Please Remove the water dust filter from the monitor before connecting the gas cylinder The sp...

Страница 48: ...ube inlet and expose the O2 cell directly The On Demand Regulator will permit gas to flow at the flow rate programmed into the Sample Draw Monitor Expose the monitor for 1 minute and then adjust the reading to 20 9 when using Zero Grade air Remove the tube from the On Demand Regulator and remove the Zero grade air from the monitor The final reading should be within 0 3 of the span gas concentratio...

Страница 49: ... All PureAire O2 monitors have a built in 4 20mA output The remote display alarm easily connects to the monitor s input power and mA output connection An 18 AWG three conductor shielded control and instrumentation cable Belden 8770 or equivalent is recommended for the connection The maximum permissible cable length is 250 feet You can simultaneously connect one remote display to one Air Check Oxyg...

Страница 50: ...parate the front panel from the case Mount the case to a wall or other flat surface There are 4ea through holes for fastening the case The case is designed to be flush mounted NOTE The front cover can be removed from the case by gently pulling on the plastic hinges they will stay connected to the front cover To connect the front cover just push the plastic hinge into the case ...

Страница 51: ... 2 Alarm Polarity Switches These switches are used to select when the alarms will activate For oxygen the alarm switches are set for Below If the readings go below an ambient level i e 19 5 then the internal horn and LED s will activate When used with our toxic gas monitors the polarity is set to Above Normally set at the factory 3 Range Auto Adjustment Switches These switches are used to adjust t...

Страница 52: ...isplay Alarm Indicator How to Setup and Operate the Remote Display CAUTION Entering the set up menus will disable the real time oxygen readings After wiring the remote display to your Oxygen monitor turn on the power to your oxygen monitor During the warmup the remote display will illuminate a yellow fault LED and the display will read FLt indicating that the oxygen monitor is in fault This will c...

Страница 53: ...essary you can push the joystick up or down to fine tune the full scale reading once To return the main menu push the Joystick left until the monitor scrolls Oxygen 0 25 on the top line NOTE To fine tune the reading to match the reading on the oxygen monitor use the Set 20mA Span menu Push the joystick up or down until both displays match CAUTION If the oxygen monitor is in the measuring mode and ...

Страница 54: ...t will be lit Use the UP or DOWN buttons to increase or decrease the alarm value When done push the Alarm 2 button for 2 seconds to get back to the monitoring mode How to connect a Horn and Strobe to the O2 monitor This drawing shows how to connect a remote Horn and strobe to PureAire s Oxygen monitor with the Alarm relay 1 set to a Normally Open position Note Federal Signal Horn Strobe or equival...

Страница 55: ...Strip External relay coil Relay coil voltage rating must match external voltage source External relay using internal 24 VDC power supply COM N O Relay 1 or Relay 2 Terminal Strip 24 VDC 24 VDC External 24 VDC relay coil Install 1N4004 or similar diode across coil CAUTION PureAire Monitoring Systems does not recommend using 120VAC or higher voltage inside the monitor Please do not use higher than 2...

Страница 56: ...eAire Monitoring Systems Inc 53 P a g e How to convert 4 20mA current output to a 1 5 VDC voltage output PureAire O2 Monitor 4 20mA output User PLC input Attach 250 ohm resistor to the PLC or device input ...

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