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Summary of Contents for RKI Instruments GX-82
- Page 1 Instruction Manual Model GX-82 Portable Three Gas Monitor Part Number: 71-0000RK Edition: Second Released: November 1997 RKI Instruments, Inc. • 33248 Central Ave. Union City, CA 94587 • (510) 441-5656...
- Page 2 RKI 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. This warranty does not apply to items that are subject to deterioration or consumption in normal service, and which must be cleaned, repaired, or replaced routinely.
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Page 3: Table Of Contents
Appendix A: Parts List ............16 Appendix B: RKI Model GX-82 Relative Response Chart ......17 Model GX-82 Operator’s Manual... - Page 4 Model GX-82 Operator’s Manual...
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Page 5: Introduction
(CO or H The GX-82 is compact enough to be worn on a belt loop or shoulder strap, which leaves your hands free. It has a tough plastic housing, touch-pad control panel, back-lit display, and comes with a vinyl carrying case. -
Page 6: Components And Controls
The GX-82 has a rigid plastic case that is durable and shock-resistant. The sensors are housed in a metal diffusion head at the bottom of the GX-82. The touch-pad control panel and display are located on the top. The carrying case has openings for the diffusion grill, buzzer, remote alarm, earphone jack, and control panel. -
Page 7: Control Panel
Control Panel The control panel is at the top of the GX-82 for easy access when you carry the GX-82. The control panel contains the display, alarm lights, and buttons that control the many functions of the GX-82. -
Page 8: Buzzers And Earphone
A plastic strap with a snap fastener is included to secure the cover in place for everyday use. The GX-82 uses two “C” size cells. Standard alkaline batteries will run the GX-82 for approximately 10 hours; rechargeable nickel-cadmium (Ni-Cd) batteries will run the GX-82 for approximately 9 hours. -
Page 9: Operation
WARNING: If the GX-82 does not respond to these verifications, take it to a known “fresh-air” environment, then follow the AUTO ZERO procedure in Normal Operation. -
Page 10: Normal Operation
S or CO average exposure ( D= XXX ppm ), and duration of the measurement in minutes ( *XXXM ). The GX-82 returns to normal operation after five seconds. The duration of the measurement is the time elapsed since the last time the GX-82 was turned on. -
Page 11: Alarms
Alarms This section describes the GX-82’s gas alarms. Table 3 lists the low and high alarm levels for each channel. Table 3: GX-82 Alarm Levels Channel High 10% LEL 50% LEL 19.5% O 23.5% O 10.0 ppm 30.0 ppm 25 ppm... -
Page 12: Safety Self-Check
GX-82. See “Displaying battery voltage” on page 6. Emergency Operation The GX-82 can operate temporarily with up to three failed sensors. If a sensor(s) fails or is absent at start-up, the GX-82 sounds a seven-tone alert, displays FAIL COMB O2 CO (any combination of two) then adjusts to operate on the remaining sensor(s). -
Page 13: Calibration
H S or CO span. The remaining adjustments are made using the Auto Zero/Span function. NOTE: Adjust the GX-82 when a gas reading drifts below zero or a sensor has been replaced. Supplies and Equipment To adjust the GX-82, you will need the following supplies and equipment, available in an RKI Calibration Kit: •... - Page 14 ZERO control. NOTE: If the oxygen reading cannot be adjusted to 0.0, replace the oxygen sensor. If the oxygen reading does not return to 20.9% the next time the GX-82 is turned on, replace the oxygen sensor. Calibrating the toxic gas channel The H S and CO circuits use the same procedure for span adjustment.
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Page 15: Calibration With The Rki Four-Gas Cylinder
Calibrating with the RKI Four-Gas Cylinder A specially mixed cylinder of gases is available from RKI Instruments that contains the following mixture: • 50% LEL methane (CH • 12% O • 25 ppm H • 50 ppm CO The RKI Four-Gas Cylinder is ideal for verifying or calibrating all four gas detection ranges. -
Page 16: Maintenance
The batteries continuously supply a small current to maintain the H S and CO sensors, even when the GX-82 is off (see Sensor Maintenance). This current drain is minimal but will result in a normal discharge of the batteries over a period of several weeks. -
Page 17: Sensor Replacement
Reinstall the sensor block and cover. Start-up the GX-82 and verify operation as described in “Start-up” on page 5. Calibrate the new sensor as described in “Calibration” on page 9. Model GX-82 Instruction Manual... -
Page 18: Accessories
Accessories Extender Cable The extender cable extends the sensor block up to 10 meters from the GX-82. You can use the extender cable to test confined spaces or for remote monitoring. The extender cable accessory includes: • cable (with sensor block plug and socket) •... -
Page 19: Sample-Draw Pump
With the vinyl case on the GX-82, slide the adapter into place over the sensor cover. Start-up the GX-82 and verify operation as described in “Start-up” on page 5. CAUTION: Do not place the probe tip in liquid or other materials that could be drawn into the sample-draw aspirator or the GX-82. -
Page 20: Appendix A: Parts List
33-7101RK Filter (charcoal) 33-7104RK Filter retainer 61-0220RK Combustible gas sensor 65-1051RK Oxygen sensor 65-2003RK Carbon monoxide sensor 65-2023RK Sulfur dioxide sensor 65-2033RK Hydrogen sulfide sensor 71-0000RK Model GX-82 Instruction Manual 16 • Appendix A: Parts List Model GX-82 Instruction Manual... -
Page 21: Appendix B: Rki Model Gx-82 Relative Response Chart
Appendix B: RKI Model GX-82 Relative Response Chart NOTE: The following response chart is based on a GX-82 that is calibrated to methane. Methane Hydrogen Ethylene Acetylene Hexane GAS CONCENTRATION - %LEL Model GX-82 Instruction Manual Appendix B: RKI Model GX-82 Relative Response Chart • 17... - Page 22 18 • Appendix B: RKI Model GX-82 Relative Response Chart Model GX-82 Instruction Manual...
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