User Manual - Calibration Technologies
Contents
1. CALIBRATION KiT gt KIT J a 2 2 rr ALIB ECH INC INSTRUCTION amp CALIBRATION MANUAL Calibration Table of Contents General description 4 4 as fate ate ee ole 5 See See 6 ee rae eae enter ee ent ener a nee E eee 7 ae EE E E AE E 8 9 10 11 ee a een eae eR er ee 12 GG ZS 13 eor cect 14 a 15 CGO E EEA awa gsc E E E 16 2 a A a e 17 CO2 18 19 Calibration Technologies 866 394 5861 Calibration General Description The gas sensor Calibration Kit and replacement cylinders allow for field calibration of most fixed and portable gas detectors This manual has been prepared to aid in the calibration of Calibration Technologies gas sensors Please refer to the manual shipped with each piece of equipment for further information The calibration kit may contain either one or two disposable bottles filled with the dry gas appropriate for the sensor Also included in the kit are the following e Regulator with pressure gauge e 2 Calibration adapters e Hose The disposable certified gas cylinders are 1 traceable After initi2. 4 Zero adjustment j SPAN gt testis Inc 40 to 200 mVDC GG 02 RC Test Span adjustment Sensor Life These galvanic electrochemical cells are long life sensors with a typical life of 5 7 years in 20 9 oxygen NH3 Responder portable ammonia detector comes factory calibrated and should require only minimal adjustments after purchase Calibration should be performed at 6 month intervals Note Verify that the calibration gas being used matches the span concentration values that are set for the detector in the Use Option Menu Refer to Soan Gas Value section on page 8 of the operating manual Correction factors are not applied during calibration Correction factors that were set prior to calibration are restored when the detector returns to normal operation Selecting sensor s to be calibrated during Auto Span is not necessary for calibration of the PID and LEL sensors as the cal gas being used will only be detected by its corresponding sensor Required calibration gas PID 250 ppm Ammonia balance air LEL 50 LEL Methane 2 5 balance air Start Calibration 1 To enter calibration press and hold and simultaneously as the detector beeps flashes and vibrates to the corresponding countdown The detector then reads Starting calibration Auto Zero 2 flashes while the detector automatically zeroes the sensors Do not apply calibration gas during this proces
3. basis Calibration GG CL2 The GasGuard CL2 chlorine sensor comes factory calibrated and should require only minimal adjustments after installation Calibration should be performed at 6 month intervals after installation There are two pots on the preamp that are used for calibration Note Never measure sensor output in mA Always use mVDC or VDC voltmeter settings Zero Calibration After the sensor is installed and has been powered up for a minimum of 12 hours the unit can be zero calibrated by the following e Be sure the unit is in clean air target gas is not present or else apply Zero Air calibration gas at 0 8 L min e Adjust the zero pot until the sensor outputs 40 mV from Test to Test Note To zero the sensor immediately after power up or cell replacement unplug cell from the transmitter and adjust signal to 40 mV Span Calibration Apply span gas at 0 8 L min span gas must be in air not nitrogen e Sensor should react to gas within 15 seconds e Once the output signal has peaked or two minutes maximum adjust the span pot until the correct output is achieved The calculated span value with full scale span gas is 200 mVDC span gas sensor range 16 4 10 e Calibration is now complete is GASGUARD CL2 Sensor cable plugs into socket Green LED indicates power Red LED indicates filter activation Span adjustment Zero adjustment 1 UNC Test 4
4. within 15 seconds e Once the output signal has peaked or two minutes maximum adjust the span pot until the correct output is achieved The calculated span value with full scale span gas is 200 mVDC span gas sensor range 16 4 10 e Calibration is now complete GE GASGUARD H2S Sensor cable plugs into socket Green LED indicates power Red LED indicates filter activation Span adjustment Zero adjustment mM 4 1 40 0 200 2 Sensor Life These electrochemical cells are extremely reliable with a typical cell life of 3 4 years in most applications Several factors can cause the cell chemicals to become depleted including a long period of time exposure to high temperatures and continuous long term exposure to hydrogen sulfide gas When the cell becomes depleted the unit will give no indication of failure other than that the sensor will not respond For this reason it is absolutely essential that these sensors be calibrated on a regular basis Calibration 2 The GasGuard CO2 carbon dioxide sensor comes factory calibrated and should require only minimal adjustments after installation Calibration should be performed at 6 month intervals after installation There are two pots on the preamp that are used for calibration Note Never measure sensor output in mA Always use mVDC or VDC voltmeter settings Zero Calibration Aft
5. 0 to 200 mVDC Black Red Sensor Life These electrochemical cells are extremely reliable with a typical cell life of 2 3 years in most applications Several factors can cause the cell chemicals to become depleted including a long period of time exposure to high temperatures and continuous long term exposure to chlorine gas When the cell becomes depleted the unit will give no indication of failure other than that the sensor will not respond For this reason it is absolutely essential that these sensors be calibrated on a regular basis The GasGuard ozone sensor comes factory calibrated and should require only minimal adjustments after installation Calibration should be performed at 6 month intervals after installation There are two pots on the preamp that are used for calibration Note Never measure sensor output in mA Always use mVDC or VDC voltmeter settings Zero Calibration After the unit is installed and has been powered up for a minimum of 12 hours the unit can be zero calibrated by the following e Be sure the unit is in clean air target gas is not present or else apply Zero Air calibration gas at 0 5 to 1 0 L min e Adjust the zero pot until the sensor outputs 40 mV from Test to Test Span Calibration Never adjust the span pot without an ozone generator Perform zero adjustment before spanning Apply span gas at 0 5 to 1 0 L min Sensor should react to gas within 20 seconds Once th
6. 61 GASGUARD H2 1 Span adjustment Zero adjustment il 4mA adjustment Sometimes a fine adjustment of the 4mA signal may be desired to compensate for a slight positive or negative zero signal reading on the control panel e Make sure the sensor is NOT in calibration mode e Adjust the 4mA pot until the control panel reads zero Sensor life These catalytic bead long life sensors have an expected life of 5 years in most applications Calibration The GasGuard 2 hydrogen sulfide sensor comes factory calibrated and should require only minimal adjustments after installation Calibration should be performed at 6 month intervals after installation There are two pots on the preamp that are used for calibration Note Never measure sensor output in mA Always use mVDC or VDC voltmeter settings Zero Calibration After the sensor is installed and has been powered up for a minimum of 12 hours the unit can be zero calibrated by the following e Be sure the unit is in clean air target gas is not present or else apply Zero Air calibration gas at 0 8 L min e Adjust the zero pot until the sensor outputs 40 mV from Test to Test Note To zero the sensor immediately after power up or cell replacement unplug cell from the transmitter and adjust signal to 40 mV Span Calibration Apply span gas at 0 8 L min span gas must be in air not nitrogen e Sensor should react to gas
7. al purchase replacement cylinders can be ordered at any time Standard cylinder sizes include either 17 or 29 liter cylinders The 17L cal kit will include a regulator female fitting for use with the CGA600 outlet fitting male fitting of the 17L cylinder The 29L cal kit will include a regulator male fitting for use with the C 10 outlet fitting female fitting of the 29L cylinder Because calibration gas has a shelf life each bottle has an expiration date printed on it Do not use the calibration gas after the expiration date Each regulator is preset for 0 8 liters per minute with an easy on off valve and includes a cylinder pressure gauge The Calibration Kit also includes 3 feet of Norprene tubing and flexible calibration adaptors designed to fit most standard size gas cells and sensors All kit accessories are enclosed in a durable hard carrying case with foam inserts Getting Started Startup Refer to sensor manual for power up warm up procedures if power has recently been applied to the sensor as some sensors may require a stabilization period before calibration is possible It may be suitable to bypass external alarms and other equipment until the calibration of the sensor is completed so as not to disrupt plant operations Verification of alarm functions is recommended on a yearly basis Alarm and readout verification Because sensors are normally located at a distance from the main unit the test time required and accurac
8. ases However the voltage that you set at the transmitter test point will be different for each gas The table on this page provides the voltage setting for various gases and the corresponding percent LEL reading for each Zero and span adjustments Orange yellow and violet sensor wires connect to transmitter here 4 866 394 5861 E af Model GG LEL CH4 input 24 VDC 0 10 A 55 Output 41020 Range 0 100 LEL 1 Serial C0100055 40 to 200 mVDC Sig test points Sensor using 1 4 calibration gas Voltage mVDC LEL Methane Propane n Butane n Pentane n Hexane Hydrogen Methanol Ethanol Isopropyl Alcohol Acetone Toluene Acetylene Di ethyl Ether Ammonia The GasGuard CO carbon monoxide sensor comes factory calibrated and should require only minimal adjustments after installation Calibration should be performed at 6 month intervals after installation There are two pots on the preamp that are used for calibration Note Never measure sensor output in mA Always use mVDC or VDC voltmeter settings Zero Calibration After the sensor is installed and has been powered up for a minimum of 12 hours the unit can be zero calibrated by the following e Be sure the unit is in clean air target gas is not present or else apply Zero Air calibration gas or nitrogen at 0 8 L m
9. e output signal has peaked or five minutes maximum adjust the span pot until the correct output is achieved e Calibration is now complete Note If an ozone generator is not available the unit can be calibrated with chlorine The relative response of the ozone sensor to chlorine is 1 33 To calibrate with chlorine apply 0 5 ppm and adjust output to 14 64 mA Calibration Kit Zero adjustment Sensor cable plugs into socket 1 Span adjustment Gas Sensor Life These electrochemical cells are extremely reliable with a typical cell life of 2 years in most applications Several factors can cause the cell chemicals to become depleted including a long period of time exposure to high temperatures and continuous long term exposure to ozone gas GASGUARD 4 0 1 40 200 mV When the cell becomes depleted the unit will give no indication of failure other than that the sensor will not respond For this reason it is absolutely essential that these sensors be calibrated on a regular basis Calibration 2 1 The GasGuard 2 1 hydrogen sensor comes factory calibrated and should require only minimal adjustments after installation Calibration should be performed six months after installation There are two pots on the preamp that are used for calibration Note Never measure sensor output mA Always use mVDC or VDC voltmeter settings Calib
10. er the unit is installed and has been powered up for a minimum of 2 hours the unit can be zero calibrated by the following e Apply Zero Air calibration gas or nitrogen at 0 8 L min e Adjust the zero pot until the sensor outputs 40 mVDC from test points TP to TP Span Calibration e Perform zero calibration prior to spanning e Connect tubing to the calibration port of the infrared tube e Apply span gas at 0 8 L min e Sensor should react to gas within 10 seconds The adjustment response is dampened Make slight adjustments no more than gt turn of the potentiometer and wait for output response Once the output signal has peaked or two minutes maximum adjust the span pot until the correct output is achieved The calculated span value with full scale span gas is 200 mVDC span gas sensor range 16 4 10 Example 1 3 x 16 4 x 10 93 3 mVDC e Calibration is now complete Zero and Span adjustments Cuan ce 394 5861 Wos ZERO POWER 4 FAULT Calibrati port ik wey Sensor Life Typical sensor life of the GasGuard 2 is five to seven years Failure of the infrared sensor happens normally when the infrared source opens or breaks similar to an incandescent light bulb filament If this occurs the sensor will produce a continuous fault indication signal of 0 5 mA and the fault LED will be lit Contact Calibration Technologies f
11. g used matches the span concentration or to bypass the calibration due dates value s that are set for the detector in the User Options Menu Refer to Span Gas Value section in the operating manual Required calibration gas CO2 1 CO2 balance air Start Calibration 1 To enter calibration press and hold O and simultaneously as the detector beeps flashes and vibrates to the corresponding countdown The detector then reads Starting calibration Auto Zero 2 flashes while the detector automatically zeroes the sensors Do not apply calibration gas during this process otherwise the auto zero step will fail Auto Span 3 Next three screens are displayed Apply span gas now to calibrate recommended skip to step 4 or press to select sensor s or press to skip calibration skip to step 5 ifa Apply Span Gas Now RESPONDER 4 Attach the calibration hose and apply gas to the sensor s at a flow rate of 500 ml min The cal gas cylinder icon flashes as the detector initially detects the calibration gas After 30 seconds the detector beeps and the cal gas cylinder stops flashing flashes while spanning the sensors until the detector has attained a sufficient level of the expected gas Limited Warranty amp Limitation of Liability Calibration Technologies Inc warrants this product to be free from defects in material and workmanship under normal use and service for a period of two years begin
12. in e Adjust the zero pot until the sensor outputs 40 mV from Test to Test Note To zero the sensor immediately after power up or cell replacement unplug cell from the transmitter and adjust signal to 40 mV Span Calibration Apply span gas at 0 8 L min Span gas must be in air not nitrogen e Sensor should react to gas within 15 seconds Once the output signal has peaked or two minutes maximum adjust the span pot until the correct output is achieved The calculated span value with full scale span gas is 200 mVDC span gas sensor range 16 4 10 Example 100 ppm 200 ppm x 16 4 x 10 120 mVDC e Calibration is now complete Calibration Kit Sensor cable plugs into socket gt Wee 200 Green LED indicates power Red LED indicates filter activation Span adjustment Zero adjustment 40 to 200 mVDC o Black Sensor Life These electrochemical cells are extremely reliable with a typical cell life of 5 years in most applications Several factors can cause the cell chemicals to become depleted including a long period of time exposure to high temperatures and continuous long term exposure to carbon monoxide When the cell becomes depleted the unit will give no indication of failure other than that the sensor will not respond For this reason it is absolutely essential that these sensors be calibrated on a regular
13. led and has been powered up for a minimum of 8 hours the unit can be zero calibrated by the following e Be sure the unit is in clean air target gas is not present or apply Zero Air calibration gas at 0 8 L min e Adjust the zero pot until the sensor outputs 40 mV from Test to Test Note To zero the sensor immediately after power up or cell replacement unplug the cell from the transmitter and adjust signal to 40 mV Span Calibration Apply span gas at 0 8 L min Span gas must be balanced in air not nitrogen e Sensor should react to gas within 15 seconds e Once the output signal has peaked or two minutes maximum adjust the span pot until the correct output is achieved The calculated span value with full scale span gas is 200 mVDC span gas sensor range 16 4 10 Example 100 ppm 250 ppm x 16 4 x 10 104 mVDC e Calibration is now complete Calibration Kit 866 394 5861 0100 Inc 0 250 p Sensor cable plugs into socket here Green LED indicates power when lit Red LED indicates filter mode Span adjustment Zero adjustment 40 to 200 mVDC Test 2020 SHLD GND 24 SIG Sensor Life These electrochemical cells are extremely reliable with a typical cell life of 2 3 years in most applications Several factors can cause the cell chemicals to become depleted including a long period of time exposure to high temperatures and continuous lo
14. ng term exposure to ammonia gas When the cell becomes depleted the unit will give no indication of failure other than that the sensor will not respond For this reason it is absolutely essential that these sensors be calibrated on a regular basis Calibration GG NH3 2 The GasGuard NH3 2 ammonia sensor comes factory calibrated and should require only minimal adjustments after installation Calibration should be performed six months after installation There are two pots on the preamp that are used for calibration Note Never measure sensor output in mA Always use mVDC VDC voltmeter settings Calibration Mode Cal mode is required for calibrating the sensor It clears the deadband factory set at 4 8 mA and averaging Pressing the CAL switch enables cal mode and the green LED will flash To exit out of cal mode press the CAL switch or after 4 minutes it will automatically time out Zero Calibration After the unit is installed and has been powered up for a minimum of 1 hour the unit can be zero calibrated by the following e Be sure the unit is in clean air with no noticeable ammonia vapors e Press the CAL switch once to enter cal mode Do not adjust the zero pot if the green LED is not flashing Adjust the zero pot until the sensor outputs 40 mV from to TP Span Calibration Do not remove sensor housing cap during calibration e f green LED is not flashing press the CAL switch once to enter cal m
15. ning on the date of shipment to the buyer This warranty extends only to the sale of new and unused products to the original buyer warranty obligation is limited at CTI s option to refund of the purchase price repair or replacement of a defective product that is returned to a CTI authorized service center within the warranty period In no event shall liability hereunder exceed the purchase price actually paid by the buyer for the Product This warranty does not include a routine replacement of parts due to the normal wear and tear of the product arising from use b any product which in CTI s opinion has been misused altered neglected or damaged by accident or abnormal conditions of operation handling or use any damage or defects attributable to repair of the product by any person other than an authorized dealer or contractor or the installation of unapproved parts on the product The obligations set forth in this warranty are conditional on a proper storage installation calibration use maintenance and compliance with the product manual instructions and any other applicable recommendations of CT b the buyer promptly notifying of any defect and if required promptly making the product available for correction No goods shall be returned to CTI until receipt by the buyer of shipping instructions from CTI and the right of CTI to require that the buyer provide proof of purchase such as the original inv
16. ode Apply 2 NH3 span gas at 0 8 L min span gas must be balanced in air not nitrogen e Sensor should react to gas within 15 seconds e Once the output signal has peaked or two minutes maximum adjust the span pot until the correct output is achieved 200 mV e Calibration is now complete Green LED indicates power when lit Red LED indicates hardware failure if lit Only unscrew sensor housing cap to gain access for sensor replacement Sensor plugs into socket here Do not remove for calibration purposes Inc 866 394 5861 GASGUARD NH3 2 A Span adjustment Zero adjustment il Sensor 3 gt Q 4mA adjustment Sometimes a fine adjustment of the 4mA signal may be desired to compensate for a slight positive or negative zero signal reading on the control panel e Make sure the sensor is NOT in calibration mode e Adjust the 4mA pot until the control panel reads zero Sensor life These catalytic bead long life sensors have an expected life of 5 7 years in mechanical room applications GG VL The GasGuard Vent Line sensor comes factory calibrated and should not require any adjustments after installation If any adjustments are required there are two pots on the preamp that are used for calibration Note Never measure sensor output in mA Always use mVDC or VDC voltmeter settings Response Test It is recommended that the GasGua
17. oice bill of sale or packing slip to establish that the product is within the warranty period THE BUYER AGREES THAT THIS WARRANTY IS THE BUYER S SOLE AND EXCLUSIVE REMEDY AND IS IN LIEU OF ALL OTHER WARRANTIES EXPRESS OR IMPLIED INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE CTI SHALL NOT BE LIABLE FOR ANY SPECIAL INDIRECT INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOSSES INCLUDING LOSS OF DATA WHETHER ARISING FROM BREACH OF WARRANTY OR BASED ON CONTRACT TORT OR RELIANCE OR ANY OTHER THEORY 19 LIBR an O pom Ni bal ae 2 341 125 85202 Date January 2013 wor anuary 2014 kision Calibration Gas 9 252 pom NHJ tel af ow wwe com 71 870 deg 240 PSG ber A Cal Kit 06 2014
18. or a sensor replacement The GasGuard R refrigerant sensor comes factory calibrated and should require only minimal adjustments after installation Calibration should be performed at 6 month intervals after installation There are two pots on the preamp that are used for calibration Note Never measure sensor output in mA Always use mVDC or VDC voltmeter settings Zero Calibration After the unit is installed and has been powered up for a minimum of 2 hours the unit can be zero calibrated by the following e Be sure the unit is in clean air target gas is not present or else apply Zero Air calibration gas or nitrogen at 0 8 L min e Adjust the zero pot until the sensor outputs 40 mVDC from test points TP to TP Span Calibration e Perform zero calibration prior to spanning e Connect tubing to the calibration port of the infrared tube e Apply span gas at 0 8 L min e Sensor should react to gas within 10 seconds The adjustment response is dampened Make slight adjustments no more than gt turn of the potentiometer and wait for output response Once the output signal has peaked or two minutes maximum adjust the span pot until the correct output is achieved The calculated span value with full scale span gas is 200 mVDC span gas sensor range 16 4 10 Example 500 ppm 1000 ppm x 16 4 x 10 120 mVDC e Calibration is now complete Calibration Kit Calibration Sensor Life Expected sen
19. ration Mode Cal mode is required for calibrating the sensor It clears the deadband factory set at 4 8 mA and averaging Pressing the CAL switch enables cal mode and the green LED will flash To exit out of cal mode press the CAL switch or after 4 minutes it will automatically time out Zero Calibration After the unit is installed and has been powered up for a minimum of 1 hour the unit can be zero calibrated by the following e Press the CAL switch once to enter cal mode Do not adjust the zero pot if the green LED is not flashing e Apply Zero Air calibration gas or nitrogen at 0 8 L min e Adjust the zero pot until the sensor outputs 40 mV from TP to TP Span Calibration Do not remove sensor housing cap during calibration e f green LED is not flashing press the CAL switch once to enter cal mode Apply 1 H2 span gas at 0 8 L min Span gas must be in air not nitrogen e Sensor should react to gas within 15 seconds e Once the output signal has peaked or two minutes maximum adjust the span pot until the correct output is achieved 200 mV Press the CAL switch again to exit cal mode green LED will stop flashing e Calibration is now complete Green LED indicates power when lit Red LED indicates hardware failure if lit Only unscrew sensor housing cap to gain access for sensor replacement Sensor plugs into socket here Do not remove for calibration purposes s Drom Inc 866 394 58
20. rd Vent Line sensor be response tested only every six months If sensor calibration is required refer to the Zero and Span calibration procedures on this page 1 One person removes the 12 plug in the tee and injects small amount of propane butane from an unlit plumber s torch 2 The second person stays at the control panel to determine that each sensor when exposed to the gas is connected to the proper input and responds causing appropriate alarm functions Zero Calibration After the unit is installed and has been powered up for a minimum of 24 hours the unit can be zero calibrated by the following sure the unit is in clean air with no noticeable vapors or else apply Zero Air calibration gas at 0 8 L min e Adjust the zero pot until the sensor outputs 40 mV from Test to Test Span Calibration e Unscrew the union nut of mounting kit making sure to support weight of sensor assembly This will expose the sensor and allow for a more accurate span calibration e Apply 1 NH3 span gas at 0 8 L min Use full scale target gas if sensor is used for gases other than detection of ammonia e Once the output signal has peaked or one minute maximum adjust the span pot until the sensor outputs 200 mV from Test to Test e Calibration is now complete Calibration Kit 40 to 200 Test mVDC Se es ree A Fault P l au ower Sensor Connector a ZERO SPAN 7
21. s otherwise the auto zero step will fail Auto Span 3 Next three screens are displayed Apply span gas now to calibrate recommended skip to step 4 or press to select sensor s press to skip calibration skip to step 5 Calibration Kit Apply Span Gas Now 4 Attach the calibration hose and apply gas to the unit at a flow rate of 0 5 to 0 8 l min The cal gas cylinder icon flashes as the detector initially detects the calibration gas After 30 seconds the detector beeps and the cal gas cylinder stops flashing flashes while spanning the respective sensor until the detector has attained a sufficient level of the expected gas 5 When the span is complete the following screens are displayed Calibration successful Press 5 to apply new cal gas repeat step 4 Press to end span Remove hose and turn off cal gas The display then advises to press to set or to bypass the calibration due dates Calibration CO2 Responder 5 When the span is complete the following screens are displayed The CO2 Responder portable carbon dioxide detector comes factory calibrated Calibration successful and should require only minimal adjustments after purchase Calibration should Press 5 to apply new cal gas repeat step 4 be performed at 6 month intervals Press 7 to end span Note Remove hose and turn off cal gas The display then advises to press O to set Verify that the calibration gas bein
22. sor life of the GasGuard R is ten years Typical failure of the infrared sensor happens normally when the infrared source opens or breaks If this occurs the sensor will produce a continuous fault indication signal of 0 5 mA and the fault LED will be lit Contact Calibration Technologies for a sensor replacement Calibration The GasGuard O2 oxygen sensor comes factory calibrated and should require only minimal adjustments after installation Calibration should be performed at 6 month intervals after installation There are two pots on the preamp that are used for calibration Note Never measure sensor output in mA Always use mVDC or VDC voltmeter settings Zero Calibration If zero adjustment is required the following procedure will span the unit e Apply zero calibration gas nitrogen or 15 oxygen depending on full scale range of sensor at 0 8 L min e Sensor should react to gas within 30 seconds e Adjust the zero pot until the sensor outputs 40 mV from Test to Test Span Calibration e Apply 20 9 O2 span gas at 0 8 L min e Once the output signal has peaked or three minutes maximum adjust the span pot until the correct output is achieved see Note below e Calibration is now complete Note Calculated span value for 15 25 range is 134 4 mV from Test to Test Calculated span value for 0 25 range is 173 7 mV from Test to Test GIRS IP Inc 266 394 5961 GASGUARD 02 ZERO
23. y of the response checks will be improved if two people perform the start up procedures and use radio contact Ensure that the calibration gas concentration is equal to or greater than the alarm setpoints if alarm verification is required Cell sensor replacement Below are a few response characteristics which may be an indication that the gas sensor is at or near the end of its useful life If any of these are observed the sensor should be replaced Slow response to recovery from calibration gas e Failure of the output to reach 50 of the calibration gas value prior to span adjustment e Unable to achieve correct span output during calibration Refer to sensor manual for more details Calibration Guidelines In highly critical areas a response test should be performed between calibrations to verify proper sensor response and alarm functions This can be done with bump gas calibration gas or a gas sample The response test is not required if multiple like sensors are installed in the same room All tests and calibrations must be logged The GasGuard NH3 ammonia sensor comes factory calibrated and should require only minimal adjustments after installation Calibration should be performed at 6 month intervals after installation There are two pots on the preamp that are used for calibration Note Never measure sensor output in mA Always use mVDC or VDC voltmeter settings Zero Calibration After the sensor is instal
24. ya ca m Calibration GG LEL The GasGuard LEL sensor comes factory calibrated and should require only minimal adjustments after installation Calibration should be performed at 6 month intervals after installation There are two pots on the preamp that are used for calibration Note Never measure sensor output in mA Always use mVDC or VDC voltmeter settings Zero Calibration After the unit is installed and has been powered up for a minimum of 24 hours the unit can be zero calibrated by the following e Be sure the unit is in clean air target gas is not present or else apply Zero Air calibration gas at 0 8 L min e Adjust the zero pot until the sensor outputs 40 mV from Test to Test Span Calibration Perform zero calibration before spanning e Refer to gas table on this page for the correct span value for the target gas e Apply span gas at 0 8 L min e Sensor should react to gas within 15 seconds e Once the output signal has peaked or two minutes maximum adjust the span pot until the correct output is achieved e Calibration is now complete The combustible gas sensor has a slightly different response to each combustible gas or vapor Because of these factors a combustible transmitter must be adjusted differently if the system is meant to detect a gas or vapor other than methane A 1 methane gas standard may still be used for calibration of combustible transmitters when used for other g
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