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Summary of Contents for RKI Instruments GX-82A
- Page 1 INSTRUCTION MANUAL MODEL GX-82A PORTABLE THREE GAS DETECTOR RKI Instruments, Inc. 33248 Central Ave. Union City CA 94587 • Tel: 510-441-5656...
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Page 2: Table Of Contents
Model GX-82A Instruction Manual Table of Contents INTRODUCTION DESCRIPTION COMPONENTS AND CONTROLS Case Control Panel Switches Battery Compartment Interface Port Buzzers and Earphone Carrying Case Sensors Combustible Gas Sensor Oxygen Sensor CO, or H S (toxic gas) Sensor OPERATION Preparation... - Page 3 Model GX-82A Instruction Manual MAINTENANCE Batteries Sensor Maintenance Combustibles Sensor Sensor Toxics Sensors Sensor Replacement CO Filter ACCESSORIES Extender Cable Sample-Drawing Pump Manually-Operated Sample-Drawing Aspirator USER OPTIONS Entering Programming Mode General Programming Hints WARRANTY Table of Contents Hayward, California (510) 441-5656...
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Page 4: Introduction
INTRODUCTION The RKI Model GX-82A is an advanced gas detection instrument, incorporating proven detection hardware and microprocessor controls. The GX-82A is compact, convenient, and offers a full range of features, including: • Simultaneous detection of combustible gas, oxygen deficiency, and carbon monoxide or hydrogen sulfide (detection for other toxic... -
Page 5: Description
0 - 100 ppm (parts per mil- lion) 0 - 500 ppm The GX-82A has a rugged plastic housing, touch-pad control panel, and a back-lit dot matrix LCD. The included carrying case protects the instrument and allows hands-free operation for the user. -
Page 6: Components And Controls
Model GX-82A Instruction Manual COMPONENTS AND CONTROLS Case The GX-82A has a durable plastic case. The sensors are housed in a detachable block at the bottom of the instrument. Control Panel The control panel contains the display, alarm lights, and switches that control the many functions of the GX-82A. -
Page 7: Battery Compartment
Three red light-emitting diodes (LEDs) provide visual alarms for gas concentrations and malfunctions. Battery Compartment The GX-82A uses two “C” size cells; alkaline batteries will run the GX-82A for approximately 10 hours, rechargeable nickel-cadmium batteries will run for approximately 7 hours. (Rechargeable batteries can be recharged in the GX-82A with the optional battery charger.) -
Page 8: Buzzers And Earphone
The LEL sensor detects combustible gas and vapors in the atmosphere with a catalytic platinum element. The reaction of gas with oxygen on the catalyst causes a change in the resistance of the element, which is converted by the GX-82A into a reading of gas concentration. 062796 RKI Instruments, Inc. -
Page 9: Oxygen Sensor
The toxic gas sensor is an electrochemical cell, which reacts to gas in the atmosphere, producing a current proportional to the concentration of gas. The current is converted by the GX-82A into a measurement of gas concentration. The CO sensor uses a charcoal filter disk that... -
Page 10: Operation
(See USER OPTIONS). Press the AIR/ switch to continue Short Term Exposure Limit (STL) and Time-Weighted Average readings from the last use of the GX-82A. Press DISP/ (ADJ.) to start new STL and TWA readings STL TWA RESUME YES:AIR NO:DISP Lunchbreak can accumulate up to 100 hours of STL/TWA read- ings. - Page 11 H2S section of the dis- play. d.These messages show while the GX-82A checks itself for proper operation. If a malfunction occurs, the display will alert the user. (The display shows “HC” [hydrocarbons] for the %LEL reading.)
- Page 12 Model GX-82A Instruction Manual operation. HC O2 H2S 062796 RKI Instruments, Inc.
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Page 13: Normal Operation
Model GX-82A Instruction Manual 2. Verify Operation To easily verify correct operation of the GX-82A, breathe out over the diffusion grill of the instrument. The O2 reading should drop measurably before returning to normal. To verify detection of combustibles use a controlled source of flammable vapor, for example, a bottle of isopropyl alcohol. - Page 14 Model GX-82A Instruction Manual response. 062796 RKI Instruments, Inc.
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Page 15: Display Functions
Model GX-82A Instruction Manual DISPLAY FUNCTIONS While the GX-82A is in normal operation, press the DISPLAY/(ADJ.) switch to step through the measurement functions. The display will hold for 20 seconds before reverting to normal detection, or until DISPLAY/(ADJ.) is pressed to go to the next screen. -
Page 16: Average
The Average function shows the average gas concentrations (indicated by “A” at the left side of the display) detected since the last time the GX-82A was turned on or the data logger was cleared. HC O2 H2S A18 20.8 2.5... -
Page 17: Time-Weighted Average (Twa)
BATTERY MIN 2.3V BATTERY NOW 3.0V Note The GX-82A automatically checks battery voltage during start-up; if the measurement is below 2.3V, the GX-82A will not operate. Date / Time This function shows the current time and date, for example: DATE / TIME... -
Page 18: Clear Data Logger
Model GX-82A Instruction Manual Clear Data Logger The Clear Data Logger function allows the user to reset the data logger storage to accept a new set of data. Clearing the Data Logger also resets the Peak, Average, Time in Operation, STL, TWA, and Log. -
Page 19: Alarms
Model GX-82A Instruction Manual ALARMS Alarm Indications 1. Combustibles (%LEL) If the combustible gas detected exceeds the first level alarm setting (20% LEL for most applications), a pulsed tone will sound, the %LEL LED will blink, and the “HC” on the display will flash. -
Page 20: Resetting Alarms
field for that gas. Resetting Alarms The GX-82A can be set for latching or self-resetting logic. Latching alarms can not be reset until the gas concentration falls below the alarm point. When the condition is corrected, press (SHIFT)/ reset the alarm. -
Page 21: Malfunction Alarm And Emergency Operation
SELF DIAGNOSIS FAIL( H2S) To continue using the GX-82A, turn it off, then follow the appropriate start-up sequence. During start-up the display will show the failed channel before the count down. In normal operation display will indicate the failed sensor as “xx or xx.x.”... -
Page 22: Low Battery Alarm
Model GX-82A Instruction Manual Low Battery Alarm When the battery charge drops near the lower limit, the display will show the first screen below, with the “B” flashing. When the charge drops to the limit, the second screen will show, with the “CHANGE BATTERY”... -
Page 23: Calibration
For automatic one-source calibration, the RKI Four Gas Cylinder can be used to adjust all sensors with one connection and one operation. To calibrate the GX-82A with separate gas sources, you will need the following supplies and equipment: • Known calibrating samples of combustible and the appropriate toxic gases. -
Page 24: Calibration Start-Up
flowmeter, and adapter cup. Note Allow adequate time for the GX-82A to respond to changes in adjustment. Adjust the controls in small increments, then wait approximately 3 seconds for a change in reading. -
Page 25: Auto Calibration
Model GX-82A Instruction Manual 2. Enter calibration mode With the instrument on, press and hold the (SHIFT)/ switch, then press the DISPLAY/(ADJ.) switch. The display will show: 1.AUTO CAL. 2.SET SPAN <HC> The “1” will flash, indicating the active selection. To select Auto Calibration, press ON/OFF/ENTER. - Page 26 Model GX-82A Instruction Manual Cylinder. AUTO CALIBRATION 50 12.0 25.0 To change the calibration values, press the (SHIFT)/ DISPLAY/(ADJ.). The following screen will appear. SET CAL. <HC> 50 LEL Press the AIR/ or (SHIFT)/ to adjust the LEL value to agree with the concentration on the Four-Gas Cylinder.
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Page 27: Combustibles Span
Model GX-82A Instruction Manual END screen will appear: AUTO CALIBRATION NORMAL END d.After the end screen, the display automatically returns to the first calibration screen. e Turn off the Four-Gas Cylinder and disconnect it from the valve. f. Press (SHIFT)/ to scroll through the options to “7.RETURN,”... -
Page 28: Oxygen Zero
Model GX-82A Instruction Manual reading stabilizes: HC CAL. 45LEL GAS/ADJ./ENTER 3. If the reading does not correspond to the sample, press the AIR/ switch to increase the reading, or the (SHIFT)/ switch to decrease the reading. 4. Press ON/OFF/ENTER. The END screen will show: HC CAL. - Page 29 Model GX-82A Instruction Manual 4. The reading should fall to near zero for an oxygen-free sample, or near the level of the low concentration sample. Adjust the reading using the AIR/ or (SHIFT)/ switches. 5. Press ON/OFF/ENTER to complete the oxygen zero sequence.
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Page 30: H 2 S And Co Span
S, but the limit of linear response is 60 ppm, well above acceptable exposure levels. The GX-82A will display up to 499 ppm CO, but the limit of linear response is 150 ppm, well above acceptable expo- sure levels. If any reading cannot be set to agree with the calibrating gas sample, replace the sensor. -
Page 31: Maintenance
Only Ni-Cad cells will charge properly with the GX-82A charger. Rechargeable batteries may be recharged inside the GX-82A in a non-hazardous location. Turn the instrument off, connect the charger to the charger jack, and plug the charger into a 115 V AC outlet. -
Page 32: Sensor Maintenance
The GX-82A sensors are easy to replace, but only the combustibles sensor contains user-serviceable components. If a sensor requires replacement, call RKI or your local distributor. All sensors are warranted usable for one year from the date of shipment. -
Page 33: O 2 Sensor
Allow up to 1/2 hour after the toxics sensors have been replaced to show a normal response, then calibrate. Sensor Replacement 1. Take the GX-82A to a non-hazardous location and turn the power off. 2. Remove the instrument from the carrying case. -
Page 34: Co Filter
Model GX-82A Instruction Manual 4. To replace individual sensors, press down and turn counter-clock- wise, then pull out of block. Figure 2 shows the installation of the CO sensor with filter; do not use the filter with other sensors. Sensor... -
Page 35: Accessories
3. Flip open the spring clips at the sides of the sensor block. 4. Pull the block straight up to unplug. 5. Plug the extender cable into the GX-82A, in place of the sensor block. Flip closed the spring clips. -
Page 36: Manually-Operated Sample-Drawing Aspirator
Make sure the pump housing seats and clips securely. 2. Turn on the pump and the GX-82A and allow it to complete the start-up procedure. 3. Take the instrument into the area to be monitored. - Page 37 1. Assemble the probe, hose, bulb, and adapter. Slide the adapter into place over the sensor cover. 2. Turn on the GX-82A and allow it to complete the start-up proce- dure. 3. Take the instrument into the area to be monitored.
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Page 38: User Options
Model GX-82A Instruction Manual USER OPTIONS The advanced microprocessor program in the GX-82A allows the user to select and adjust many of the detection and data logging features. The GX-82A is pre-set to suit most applications; follow these instructions only if required. - Page 39 SET ALARM Sets the alarm levels for gases detected by the GX-82A. If different gases are specified by the GAS COMBINATION option, the Set Alarm prompts will show those gases. 1. “SET ALARM <HC>”...
- Page 40 Model GX-82A Instruction Manual 3. “SET ALARM <H2S> or <CO>” Prompts changes for LOW, TWA, STL, and CLG (ceiling) alarms for H S or CO. SET SERIAL No. Sets the serial number for use by the Data Logger. 1. At the “SERIAL No.” screen, the first character (left end) will flash.
- Page 41 (SHIFT) to scroll rapidly through values. SET LOG ALARM Sets the value of Data Logger memory capacity alerts on the GX-82A. Default setting is off, with a range of 1 - 100%. Tip: hold AIR or (SHIFT) to scroll rapidly through values.
- Page 42 Model GX-82A Instruction Manual AUTO CAL. The procedure is the same as described in Calibration and Maintenance, Auto Calibration. DISPLAY VOL. This feature is for factory use only. START Press ON/OFF/ENTER to begin the instrument’s normal start-up sequence. 062796 RKI Instruments, Inc.
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Page 43: Warranty
Co., Ltd., and sold by us to be free from defects in materials and workmanship for a period of one year from date of shipment from RKI Instruments, Inc. Any parts found defective within that period will be repaired or replaced, at our option, free of charge.
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