AGM 500 Series - GFG Instrumentation, Inc
Contents
1. HOLD key again will index the display to the combustible sensor s alarm point Pushing the ON OFF Key will lower the alarm point Pushing the GfC Key will raise the alarm point Pushing the HOLD key again will index the display to the next sensor s alarm point setting The standard alarm value for combustible is 10 LEL or 5 V on methane natural gas depending which scale you select 10 The standard percentage of oxygen in air throughout the world is 20 9 V The oxygen low alarm is set at 19 5 V and enrichment alarm at 23 5 V The peak alarm for CO is the ceiling STEL value of 200 PPM factory set to 35 PPM and the TWA value of 35 PPM when the instrument s readout is set for CO The peak alarm for H2S is the ceiling STEL value of 15 PPM factory set to 10 PPM and the TWA value of 10 PPM when the instrument readout is set for H2S Note When changing the display from CO to H2S or vice versa with the GfG key the alarm levels will also be switched to the appropriate values indicated above After setting the alarm points the date and time may be changed using the ON OFF and GfG keys After indexing through all the set up displays the unit will go into its 60 second warm up followed by the standard gas exposure display To re enter the set up mode turn the unit off by holding the OFF key for three seconds and again depressing the HOLD key while pressing the ON OFF key Note Ifthe battery is unplugged or the powe2. and freezing It is not unusual under these conditions for new units or those that have not been used recently to require the error protection be temporarily disengaged The error protection must temporarily be disengaged to allow gain adjustments that would otherwise exceed the acceptable parameters for AutoCal We will refer to this procedure as manual 12 calibration The error protection for minimum sensor response cannot be disengaged Under normal operating conditions the AGM will AutoCal and no user intervention will be required Error protected auto zero In the event the AGM does not auto zero following the normal one minute warm up the instrument will continue to use the values established by the last successful auto zero The error protection for auto zero can be disengaged by turning the monitor OFF then ON to repeat the warm up Press and hold the HOLD key for the final five seconds of the countdown CAUTION Alcohols esters and certain other gases as well as CO can interfere with the auto zero It is highly advisable to remove the instrument to a fresh air environment before repeating the auto zero Exercise extreme caution when deciding to disengage the zero protection The most common reason for an unsuccessful auto zero is the presence of toxic or combustible gas in the atmosphere when the instrument is turned on Overriding the error protection in the presence of gas will cause the instrument to read in
3. or concentration or empty gas cylinder Solution Use the correct gas type concentration and flow rate see calibration 2 Sensor response has changed due to settling or aging of the sensor Solution Press and hold the HOLD key when instructed by the display for a manual calibration 3 Sensor failure sensor output is too low for AutoCal or manual calibration to be successful Solution Sensor must be replaced by competent technician or factory Calibration GfG s calibration kit part number 7773 001 is required to calibrate the unit The kit includes a gas valve tubing calibration connector and part number 7802 016 test gas which contains 50 LEL methane and 200 PPM carbon monoxide The calibration connector has a sliding switch that activates the calibration switch inside the instrument The purpose of the sliding switch is to allow a test of the unit to confirm the gas levels without initiating a calibration When the switch is in the cal position and placed over the sensor area it will initiate AutoCal Using the captive screw secure the calibration connector to the sensor bay Be sure the calibration connector edges are fitted over the grill area and are firmly resting on the top of the case Correct orientation places the switch in the lower right corner Note The monitor must be warmed up for at least 60 minutes before attempting calibration 16 To calibrate slide the switch to the cal p
4. the error protection because large changes in sensor output have occurred since the last calibration The override will not allow a manual calibration when a sensor s output is too low or when the combustible sensor s zero moves above 20 counts If the combustible sensor is unable to zero at the end of the warm up countdown and the instrument is in clean air the combustible counts must be reset This five minute procedure is described under combustible sensor see combustible sensor The unit will probably not need to be adjusted again during the life of the combustible sensor Auto zero AutoCal trouble shooting Failure to auto zero May be caused by the following conditions 1 Gas or vapors are present in the atmosphere and the error protection is alerting you to unclean air Solution Go to a fresh air environment or use calibration air zero gas during the warm up countdown following turn on NOTE Never attempt to auto zero with calibration gas supplied to the monitor 2 Sensor response has changed due to settling or aging of the sensor Solution Press and hold the HOLD key during final seconds of warm up countdown in a fresh air environment 3 Combustible sensor counts exceed the upper limit Solution Adjust combustible zero potentiometer see changing a combustible sensor 15 Failure to AutoCal May be caused by the following conditions 1 Unacceptable calibration gas type
5. useful for taking readings prior to entering a confined space When in the hold mode an H will appear in the middle of the bottom line of the display If the unit is lowered into a confined space and then removed the peak values will be retained on the display If a gas exposure reaches the alarm point the alarm will sound until the HOLD Key is again pressed releasing both the display and the alarm If the HOLD key is depressed for more than three 3 beeps the display reading SAMPLE LOGGED will indicate the unit is recording a data sample This is only applicable when operating the instrument as a data logger where the recorded information will be downloaded to a PC Alarms and display The AGM is equipped to alarm at both peak and time weighted Average levels see Appendix A for explanation of TWA With the mini pump attached a low flow alarm and a 7 low flow message on the display will occur if the pump is not operating properly or the intake is blocked A gas reading at or above the alarm level will activate the alarm light and horn and cause the gas reading to flash In the case of a TWA alarm the standard exposure display alternates with the letters TWA A FLT message indicates that the zero readings have fallen below zero Turn the unit off and back on to initiate a new Auto Zero When the low battery alarm sounds the letter B appears in the center of the bottom line The unit will turn off auto
6. AGM 500 Series Operation Manual HIH GfG Instrumentation Worldwide Manufacturer of Gas Detection Solutions TABLE OF CONTENTS For your Safety cccee 3 Introduction to the AGM500 hazardous gas monitor 3 Operating the AGM500 4 ON OFF Ke cc000008 4 Function GfG key 5 Accessory modes DD PUMP MOQe oaesooeeeoesees00000000e 6 6 7 7 7 8 Alarm MOE eee eeeceeeeeeeteees Hold key oe Alarms and display 0 Charging eee ceeeceeeeeeeee Operating suggestions and NGI O EEE EEE ETTE 9 Battery gauge 9 Back lighting display 9 Operating auxiliary EQUIPMENT eee 9 Set up MOE eee eee 10 Introduction to error protected auto zero and A tOCA O reris 11 Error protected auto zero 13 Error protect AutoCal 14 Auto zero AutoCal trouble SNOOTNG o ondaron Calibration Bump test Page Start up following a sensor Ghanie ieia 18 Maintenance 0 ee 19 Opening case for battery replacement eee Battery replacement Sensor replacement OXYGEN SENSOF ou eee eee Carbon monoxide hydrogen sulfide SENSOP cece Combustible sensor Sensor missing alarm 22 6 0 y a ene 23 Replacement parts and ACCESSOLIES 0 0 ee eee eeeeeeee Replacement parts ACCE SSOTLIES 00085 Appendix Au eee Calculation of TWA time weighted aver
7. Holding the GfC key depressed for 8 beeps until the beeps cease will program the monitor for the pump The display will read PUMP MODE NOWI Release the GfG key Power is now directed continuously through the PTO connector for the pump Since a Low Flow Alarm occurs when in the pump mode if the pump isn t operating it is advisable to set the unit to the RA mode when the mini pump is not attached Note If the Accessory Alarm and Light is attached in pump mode it will begin to alarm and can only be stopped by removing it from the monitor or turning the monitor off To correct advance the mode setting to EXT ALRM MODE NOWI Alarm mode The high intensity lignt norn accessory requires the mode setting be advanced by again pressing and holding the GfC key for eight 8 beeps When the beeps cease the display will indicate EXT ALRM MODE NOWI Release the key and install the accessory light horn RA mode To return to the RA Mode normal setting repeat the procedure by holding the GfC key until the beeps cease and the display reads IRA MODE NOWI This setting permits the PTO connector to be operated as an output for transferring data to PC Note The TWA Mode display is always accessed by holding the GfG key depressed for one beep regardless of the Accessory Mode selected Hold key When the HOLD key is depressed for up to three 3 beeps the unit will retain Latch the peak readings This feature is
8. O H2S response table Microvolts interpreted as parts per million gas Indicates OSHA standard alarm point The presence of either gas causes a chemical reaction increasing electrical conductance H2S produces a response 2 5 X greater than CO The display will indicate the readings on the left when programmed for H2S Setting the monitor for CO will cause the readings on the right 27 Appendix C The AGM includes two toxic sensor sockets toxic A toxic B Locate your monitor from the following list and note which socket is used for a specific sensor Model Toxic A Toxic B 500 0 0 502 0 CO H2S 503 H2S 0 504 0 CO Filter 506 NO2 507 S02 508 CL2 534 H2S 536 NO2 537 S02 538 CL2 546 NO2 547 S02 548 CL2 28 LIMITED LIFETIME WARRANTY GfG Instrumentation Inc warrants each new AGM 500 product manufactured by it to be free from defective material and workmanship and that all such product is warranted as to its merchantability and fitness for the purpose intended for life to the original purchaser except as noted below and agrees to remedy any such defect or to furnish a new part at the Company s option in exchange for any part of any product of its manufacture which under normal use and service disclosed such defect provided the product is delivered by the purchaser to GfG Instrumentation s factory intact for our examination with all transp
9. S Any gas defined by the government as harmful to breathe measured in PPM TWA Time weighted average or threshold limit value of a gas The government has set levels of toxic gas workers can be exposed to over a period of time i e a worker may be exposed to 200 PPM carbon monoxide peak for a short time but can not exceed 35 PPM average over eight hours 35 PPM is the TWA for carbon monoxide 23 Replacement parts and accessories For assistance contact your distributor or GfG Instrumentation at 1 800 959 0329 or 1 734 769 0573 Replacement parts Part number Description 1401 123 Shoulder strap 4001 027 Battery charger 4002 260 Nickel metal hydride battery pack 4003 188 PC interconnect cable 5701 014 Oxygen sensor 5704 014 Carbon monoxide hydrogen sulfide sensor 5705 014 Combustible sensor 7802 016 Test gas 50 LEL methane and 200 PPM carbon monoxide 24 Accessories Part number Description 1401 122 Soft case with belt loop 4001 028 12 VDC vehicle charger 4003 195 PC program and connector for downloading data 7773 001 Calibration kit with case 7771 003 Hand aspirator attachment 7771 004 Mini pump with wand tubing and filter 9000 518 Hard carrying case includes space for calibration accessories Appendix A Calculation of TWA time weighted average Note OSHA uses an 8 hour work shift of a 40 hour work week to calculat
10. age 25 Appendix B eee eee 27 DualTox CO H2S response For your safety Like any piece of complex equipment the GfG AGM 500 series will do the job it was designed to do only if it is used and serviced in accordance with the manufacturer s instructions All individuals who have or will have the responsibility of servicing the equipment must carefully read this manual The warranties made by GfG Instrumentation with regards to this instrument are voided if the product is not used and serviced in accordance with the instructions in this manual Please protect yourself and others who depend on this instrument by following these instructions The above does not alter statements regarding GfG Instrumentation s warranties and conditions of sale and delivery Introduction to the AGM500 hazardous gas monitor The AGM 500 combines the best available gas sensors with the most advanced micro processing electronics to make the finest confined space instrument Gas detection instruments contain sensors which require periodic calibration The AGM s AutoCal feature greatly simplifies and reduces the time required for calibration To aid you in tracking your calibration history the AGM displays the last successful calibration date and time when first switched on Please check frequently for proper operation and treat the instrument with the respect due a device that can save your life This instrument was de
11. correctly and can be potentially dangerous CAUTION Do not disengage the auto zero error protection unless you are in clean fresh air Never turn the monitor OFF and ON in an alarm situation Always 13 leave the area first when an alarm sounds and follow your company s safety policies Error protect AutoCal A sensor can fail to AutoCal under two conditions 1 When the sensor response to gas is too low or 2 A large gain adjustment is required based on the setting from the last calibration A weak sensor response condition 1 will cause the following error messages to appear sequentially on the display following countdown ICO or other sensor NOT CALED SERVICE SENSOR PUSH HOLD TO ACKNOWLEDGE WARNING The user will not be protected by this sensor A sensor gain adjustment that is too large to be acceptable for AutoCal condition 2 will cause the following messages to be displayed following the calibration countdown CO or other sensor NOT CALED PUSH HOLD TO MANUALLY CALI Press HOLD when instructed to complete the calibration of the sensor Follow the additional prompt messages to complete the calibration CAUTION Be sure you are using the correct calibration gas and flow rate when error protection is disengaged If the unit is calibrated frequently calibration will usually be automatic If the unit goes for extended periods without 14 calibration however it may be necessary to override
12. e TWA permissible exposure limits PELS NIOSH on the other hand uses a 10 hour workday of a 40 hour work week Several organizations and other official bodies publish recommended PELs The GfG AGM is factory set to OSHA published PEL s and uses the OSHA recommended formula for calculating the TWA 25 The following information is taken from the OSHA standard 1910 1000 Air Contaminants 3 d Compulation formulae 1 i The cumulative exposure for an 8 hour work shift shall be computed as follows E CaTa CoTb Cn Tn 8 Where E is the equivalent exposure for the working shift Cis the concentration during any period of time T where the concentration remains constant T is the duration in hours of the exposure at the concentration C The value of E shall not exceed the 8 hour time weighted average limit in table Z 1 Z 2 or Z 3 for the material involved ii To illustrate the formula prescribed in paragraph d 1 i of this section note that isoamyl acetate has a 8 hour time weighted average limit of 100 ppm table Z 1 Assume that an employee is subject to the following exposure Two hours exposure at 150 ppm Two hours exposure at 75 ppm Four hours exposure at 50 ppm Substituting this information in the formula we have 2X150 2x75 4x50 8 81 25 ppm Since 81 25 ppm is less than 100 ppm the 8 hour time weighted average limit the exposure is acceptable 26 Appendix B DualTox C
13. ed by calibrating the instrument If the combustible sensor cannot be calibrated the combustible sensor should be replaced In environments where poisons cannot be eliminated frequent bump testing is essential to ensure safe and accurate operation of the unit 29 GEG GfG Instrumentation 1194 Oak Valley Drive Suite 20 Ann Arbor Michigan 48108 USA Tel 800 959 0329 E mail info gfg inc com Web www gfg inc com Visit our new web site at www gfg inc com 706
14. itch the unit off and while holding the GfG key depressed turn the unit back on The display will read COMB SET and show a number This number should be adjusted to about ten 10 to balance the new sensor s twin elements Any number between 5 and 20 will allow auto zero of the combustible sensor A small screwdriver control is located between toxic sensor B and the oxygen sensor With a screwdriver or pot tweaker rotate the control until the number ten appears on the display After setting to about 10 in the display push the HOLD key which will advance the unit into the standard set up mode then index using the HOLD key through the set up mode 21 until the warm up countdown begins The unit will auto zero and display the standard gas reading Note DO NOT APPLY CALIBRATION GAS UNTIL A SUCCESSFUL AUTOZERO HAS OCCURRED Follow the calibration instructions see calibration except push the HOLD key when prompted by the display at the end of the calibration countdown This temporarily disengages the calibration error protection and allows manual calibration of the new sensors When replacing the top cover be sure that the sensors fit and the compartment is sealed Replace the screws and turn the unit on Note Following the installation of a new combustible sensor a readjustment of the combustible counts control may need to be made in two to three weeks Sensor missing alarm AGM B models with serial numbers of 3000 and abo
15. lace the unit in TWA display mode showing the toxic TWA readings see Appendix A for an explanation of TWA and run time Pressing it again will return the display to the standard gas exposure mode Holding the GfC key depressed for 4 beeps will move the toxic gas exposure display from CO to H2S or vice versa Generally the unit should be set to the gas that is most likely to be encountered Remember that both H2S and CO will be detected and shown on the one reading When set to read CO the alarm points are 200 PPM peak and 35 PPM TWA When reading H2S the peak alarm will be 15 PPM and 10 PPM TWA If the AGM is being used in an environment where H2S gas is potentially present it is recommended that the H2S display be selected This gives an extra margin of protection if CO is present alarming at 46 PPM peak and 31 PPM TWA on CO see Appendix B Note All alarm points are adjustable during set up Factory settings are to OSHA standards see set up Accessory modes Because the PTO port is used to connect and power accessories it is necessary to program the monitor for the accessory in use Three different modes will be displayed while pressing and holding the GfC key Release the GfG 5 key to enter or advance The order in which these appear will depend upon the beginning mode The monitor is shipped from the factory in RA mode for interface with computer and general use with no accessory attached Pump mode
16. lug in the new one The sensor s pins are aligned so only one orientation is possible Warm up the unit for one hour to stabilize the sensor Then follow the procedure for disengaging the oxygen error protection by pressing the HOLD key for the last five seconds of the warm up The unit will be calibrated at 20 9 volume when the unit comes out of warm up Carbon monoxide hydrogen sulfide sensor Unplug the sensor by pulling up on it Be sure to remove the new sensor s shorting wire between its contacts Plug in the new sensor and warm up for one hour To auto zero the new sensor turn the unit off and then back on If the sensor fails to auto zero repeat the warm up pressing and holding the HOLD button for the last five seconds It will now require gas calibration 20 When calibrating a new toxic sensor manual calibration is required Follow the calibration directions see calibration until prompted by the display at the end of the countdown to press the HOLD button hold until the AUTOCAL FINISHED REMOVE GAS message appears Note Do not open the packaging of new sensors until you are ready to install them Exposure to oxygen decreases shelf life Note Do not press on the center portion of toxic or oxygen sensors Damage may result Combustible sensor Replace the old sensor by unplugging and replacing with the correct new sensor Leave the case open and turn the AGM on Allow the sensors to warm up for 15 minutes Sw
17. matically in approximately fifteen minutes after the low battery alarms Charging Always place the AGM on the charger when not in use The unit will rapid charge until the battery pack is about 90 charged and then trickle charge thereafter During charge the display will indicate which part of the charging cycle the instrument is in Eight hours of rapid charging are required to bring totally discharged batteries to 90 of their capacity Another few hours of trickle charging will bring them to 100 of capacity Operating suggestions and help Battery gauge The battery gauge is a measure of the batteries voltage The voltage decreases as the unit is used However the battery voltage drop is not linear throughout the discharge period The batteries discharge quickly when initially removed from the charger and then hold their voltage fairly constant throughout the run time until discharging rapidly during final hours of runtime The battery gauge will display this gradual decrease in the number of bars until the end of the discharge cycle when they disappear more rapidly The battery gauge is to be used as an approximate indication of the run time remaining Back lighting display Backlighting of the display is automatic in a dim environment Covering the clear light sensor sentinel will increase the backlighting Backlight use will consume more battery power and reduce the run time Operating auxiliary equipment To power the mini p
18. ortation prepaid to our factory provided that such examination discloses in our judgment that it is defective Chemical toxic cells and chargers have a warranty for two 2 years Oxygen cells have a warranty for twelve 12 months Rechargeable batteries electric pumps key pads and combustible sensors have a one 1 year warranty Consumable components such as filter screens are not warranted This warranty does not extend to any products which have been subjected to misuse neglect accident unauthorized modifications or to use in violation of instructions furnished by us nor does it extend to products which have been repaired or altered outside of our factory This warranty is in lieu of all warranties express or implied and no representative or person is authorized to assume for us any other liability in connection with the sale of our products All implied warranties are limited to the duration of this written warranty In no event is GfG Instrumentation Inc liable for special incidental or consequential damages arising from any breach of warranty of product CAUTION Silicone compound vapors and lead compound vapors will cause desensitization of the combustible sensor resulting in low readings and measurements Sensors should not be exposed to aerosol sprays polishes waxes and lubricants containing lead or silicones If a combustible sensor has been exposed to these environments the operation of the sensor should be verifi
19. osition far right With the calibration connector in place and the message reading FLOW GAS open the gas valve The messages AUTOCAL FINISHED REMOVE GAS will follow the countdown if calibration is successful Failure to calibrate will cause one of two messages 1 Sensor NOT CALEDI SERVICE SENSOR PUSH HOLD TO ACKNOWLEDGE If this message appears it indicates that the sensor is not responding adequately to gas be sure the proper gas is flowing over the sensor It is not possible to manually calibrate this sensor It must be serviced If you choose to continue with the calibration of the other sensors press the HOLD key as instructed WARNING The user will not be protected by this sensor 2 Sensor NOT CALED PUSH HOLD TO MANUALLY CALI If this message appears it indicates the gain setting for this sensor will be adjusted beyond the error protected limit acceptable for an AutoCal See error protected AutoCal Pressing the HOLD key when instructed will allow the necessary adjustment to occur This sensor will now be calibrated Proceed with any additional instruction displayed by the monitor CAUTION Be sure you are using the correct calibration gas at 1 0 SCFH before disengaging the error protection with the HOLD key for a manual calibration 17 The AGM 502 s toxic sensor is calibrated with relatively inexpensive carbon monoxide for both CO and H2S readings The sensor detects both gases and has a fi
20. r is interrupted the date and time must be reset Introduction to error protected auto zero and AutoCal AGM instruments incorporate the very helpful AutoCal function AutoCal greatly simplifies the operation of gas monitors Thanks to AutoCal the AGM is easy to operate easy 11 to maintain and accurate An easy to use accurate monitor increases worker safety To insure AutoCal is dependable protection is included to prevent false calibration This could occur if the wrong test gas is used a worn out sensor is present or the unit warms up in an atmosphere where gas is present The AGM uses error protection to prevent these calibration errors There are three safety checks which the computer uses to avoid calibration errors e First to accept auto zero a minimum variation from a base zero value is required This prevents zeroing in a toxic or combustible background e Second to AutoCal a minimum response to calibration gas is required This prevents calibration on weak or faulty sensors nearing the end of their useable life e Third the change to the calibration gain settings for all sensors must not exceed an allowable percentage of the previous calibration gain settings Error protection will allow auto calibration only when all these requirements are met When a unit is new the sensors require some burn in settling or seasoning time They are exposed to varying conditions in shipping including high heat
21. signed and tested for intrinsic safety This instrument was tested for intrinsic safety in explosive gas air 21 02 only The unit is UL ANSI 913 approved All AGM s have a PTO power take off port to connect a PC for transferring data logging information and to power a mini pump or HiLite for remote sampling The program is resident in each AGM to operate these optional accessories and to accept other toxic sensors consult the factory for complete information Note The data logging function in the AGM 500 is shipped disabled and would require the optional PC program amp cable part number 4003 195 for set up and use Operating the AGM500 ON OFF key Turn the unit ON with the ON OFF key and the unit will initiate a one minute warm up During the warm up the last successful calibration date and time is displayed At the end of the countdown the instrument will zero itself if the background air is fresh If one of the sensors is detecting gas its channel will fail to auto zero and will default back to the last successful zero Following the warm up a warning message appears indicating that the previous setting is being used Note See auto zero discussion see AutoCal After the countdown the standard gas exposure display will appear To turn the AGM Off press and hold the ON OFF key for three seconds This feature is designed to prevent accidental shut off Function GfG key Pressing the GfG FUNCTION Key will p
22. the warm up countdown shows five seconds and hold until the auto zeroing message appears Release the HOLD key The unit will zero and display a standard 20 9 volume oxygen gas reading Note DO NOT APPLY CALIBRATION GAS UNTIL A SUCCESSFUL AUTOZERO HAS OCCURRED To temporarily disengage the error protection and manually calibrate a new combustible or toxic sensor push and hold the HOLD key when prompted by the display and hold until the AUTOCAL FINISHED REMOVE GAS message appears Release the HOLD Key and the unit will be calibrated Error protection will automatically reengage Maintenance Opening case for battery replacement Turn the AGM Off prior to opening the case Place on a solid surface and remove the screws from both ends and the sensor cover Gently lift top slightly and tilt it towards the bottom switch end Holding the cover 90 degrees to the base allows access to the sensors After sensors have been changed reverse the 19 process Position the rubber gasket on the base Insert the top screw then compress the bottom of the cover and insert the remaining screw Battery replacement The battery plugs into the bottom circuit board and is replaced by unplugging and plugging in a new one Note Date and time must be reset see set up mode Sensor replacement To change sensors remove the two screws that secure the sensor access cover Oxygen sensor Unplug the oxygen sensor from the circuit board and p
23. ump from the PTO port the instrument needs to be set to the PUMP MODE The unit can operate as a data logger with either a pump or external horn light To off load data remove the pump or external horn light from the PTO and connect to the PC using the optional interconnect cable P N 4003 192 Be sure the AGM is in the RA MODE To use the mini pump or the HiLite follow the prompts displayed when the GfC Key is pressed The mini pump and HiLite plug into the PTO port and fastens to the sensor bay with the captive screw The PTO cap is stored in the opening formed by the pump and instrument When the AGM is turned on and 9 the program set to PUMP MODE as described the pump will also turn on The AGM with pump attached will operate continuously for more than 12 hours from the instrument s batteries CAUTION Do not operate the AGM in pump mode without the hydrophobic filter or damage to monitor may result When a blockage or low flow occurs in the inlet the AGM will alarm and a Low Flow warning appears on the display A hydrophobic filter on the pump s sample wand prohibits water from entering the pump Set up mode To enter the set up mode turn the unit off Press and hold the HOLD Key while turning the unit on and then release each key when the SET UP message appears The display will read combustible gas in LEL standard or CHa mining The ON OFF key or GfC key will change the setting Pushing the
24. ve are equipped to detect a missing toxic sensor For this reason monitors purchased from the factory without one or both of the toxic sensors installed will be equipped with an insert to bypass the sensor missing alarm To install a toxic sensor in this socket simply remove the sensor cover and discard the black rubber insert Note that Appendix C of the user s manual will guide you in the correct placement of the various toxic sensor combinations 22 For instructions in setting the software to accommodate different sensors contact GfG Instrumentation customer service Glossary CH4 The percentage by volume of combustible methane gas in an area At 5 by volume the mixture of methane is at 100 LEL and will explode LEL A percentage of the lower explosion limit of a combustible gas i e 20 LEL is 1 5 of the level of gas to have an explosion also referred to as LFL VOLUME Percent volume i e 20 9 V of oxygen is the standard percentage of oxygen by volume in air CLEAN AIR An atmosphere which contains 0 LEL combustible 20 9 volume oxygen 0 PPM hydrogen sulfide chlorine and sulfur dioxide and less than 3 PPM carbon monoxide and 2 PPM total hydrocarbon COMBUSTIBLE GAS Any gas that will ignite or explode measured in LEL or V CHa OXYGEN Percent of oxygen in the air measured in volume Normal is 20 9 volume PPM Parts per million i e 10 PPM H2S is 10 parts in a million parts of air TOXIC GA
25. xed response ratio that allows the microprocessor to convert the CO readings into calibrated hydrogen sulfide readings See Appendix B DualTox response table Five minutes after calibration the AGM will initiate new TWA readings The delay is to enable the calibration gas readings to return to zero GfG standard combustible calibration is for methane CH If you are measuring a Known combustible other than CHa use a Known LEL concentration of that gas for calibration Bump test Slide the switch to the left bump test While gas is flowing note the gas readings acceptable readings will be within a few percentage points of the calibration gas If a sensors response is too weak the unit will not calibrate No response or low response when gas is applied in the bump test mode probably indicates a new sensor is required See maintenance section Note The displayed readings for gases other than the calibration gas may or may not correspond one to one with the meter reading Start up following a sensor change After replacing a sensor the AutoCal may not calibrate the unit because of the error protection programming The error 18 protection setting is based on a calibration value from the previous sensor and needs to be disabled when a new sensor is being installed To temporarily disengage the error protection to calibrate a new oxygen sensor and to zero new toxic or combustible sensors push and hold the HOLD key when
Download Pdf Manuals
Related Search