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RKI Instruments GX-94 Portable Monitor, LEL/O2/H2S/CO - 72-0222RK

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RKI Instruments
RKI Instruments GX-94 Portable Monitor, LEL/O2/H2S/CO - 72-0222RK


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RKI Instruments GX-94 Portable Monitor, LEL/O2/H2S/CO - 72-0222RK

RKI Instruments GX-94 Portable Monitor, LEL/O2/H2S/CO - 72-0222RK



72-0222RK GX-94 Portable Monitor, LEL/O2/H2S/CO by RKI Instruments

The GX-94 is a powerful and economical solution for confined space gas monitoring requirements. For one low price you receive features such as single-button autocalibration of all gases, datalogging with a lunch break mode, continuous operation for 12 hours on only 2 size C alkaline batteries with a dual low battery alarm (warning and fully dead). You also get simultaneous readout of all 4 gases on an auto back-lit LCD display, a high impact RFI shielded housing, user adjustable audible and visual alarm settings, additional STEL / TWA / Ceiling alarms and readouts, as well as peak or average readouts. The GX-94 has proven to be a highly reliable and rugged gas monitor.

This compact portable instrument will monitor for % LEL levels of combustibles, oxygen deficiency, and ppm levels of hydrogen sulfide and carbon monoxide. The GX-94 is also ergonomically designed with a wide, steelbelt clip that positions the instrument's display and visual alarms facing up at the user. There are several sampling options with the GX-94 including its standard diffusion configuration, the attachable battery driven pump or the hand-aspirated pump. A protective, padded, waterproof carrying case is also available which custom fits the GX-94 and all of its accessories in a protective, foam padding. UL Classified as intrinsically safe.


  • RFI shielded high impact plastic
  • Microprocessor controlled
  • Simultaneous monitoring from 2 to 4 gases
  • Push button calibration
  • Internal data logger standard
  • STEL, TWA, and Ceiling display readouts
  • Peak and Average readouts
  • Auto back-lit LCD display
  • Audible and visual alarms
  • Lunch-break mode
  • Training CD included
  • Intrinsically safe, U.L. Classified


  • Confined Spaces
  • Sewage Treatment Plants
  • Utility Manholes
  • Tunnels
  • Hazardous Waste Sites
  • Refineries
  • Mines
  • Chemical Plants
  • Paper Mills

*Please note we can only ship RKI products to customers within the United States

Gas Detected Combustible gases (Methane as standard) Oxygen (O2) Hydrogen Sulfide (H2S) Carbon Monoxide (CO)
Detection Principle Catalytic combustion Galvanic cell Electro-chemical cell
Detection Range 0 ~ 99% LEL 0 ~ 40.0 vol% 0 ~ 99.5 ppm 0 ~ 500 ppm
Sampling Method Diffusion sampling
Display 2 digits
(1% LEL / digit)
3 digits
(0.1 vol % digit)
3 digits
(0.5 ppm digit)
3 digits
(1 ppm/digit)
LCD with auto backlighting
Indication Accuracy ± 2% LEL from 0 ~ 20% range
± 5% LEL for 20 to 100% range
± 0.5% Oxygen ± 1.5 ppm from 0 ~ 30 ppm range
± 5 ppm from 30 ~ 99.5 ppm range
± 5 ppm from 0 -150 ppm
± 5 ppm from 150 - 500 ppm
Alarms (User Adjustable) 1st alarm 10% LEL
2nd alarm 50% LEL
Max alarm 100% LEL
Low alarm 19.5%
High alarm 23.5%
Max alarm 40.0%
1st alarm 10 ppm
Ceiling alarm OFF
TWA alarm 10 ppm
STEL alarm 15 ppm
Max alarm 100 ppm
1st alarm 25 ppm
Ceiling alarm OFF
TWA alarm 25 ppm
STEL alarm 400 ppm
Max alarm 500 ppm
Alarm Method Buzzer (80dB) and individual LED lamp (self-reset)
Special Functions Dosimeter: Indicates Time Weighted Average (TWA), Short Term Exposure Limit (STEL)
Peak hold: Indicates highest readings since start up, lowest reading for oxygen
Delayed turn off: Approx. 5 seconds, prevents inadvertent turn off
Integral data logger: Selectable data log intervals (5 sec to 5 min), up to 45 hours total log time
Demand zero: Zero only on demand
Operating Temp. & Humidity -10°C ~ + 40°C (14 to 104°F), 0 to 95% RH, non-condensing
Data Logger Output RS-232 to PC
Continuous Operating Hours Approx. 12 hours using alkaline batteries. 8 hours using Ni-Cd batteries
Power Source C size alkaline battery (2 pcs) or Ni-Cd battery (optional, externally charged)
Safety Design Intrinsically safe, U.L. Classified, Class I, Division 1, Groups A, B, C and D
Dimensions & Weight 90 x 64 x 160mm (3.54" x 2.52" x 6.3"), approx. 700g (25 ounces)
Case Material Weather proof. RFI Shielded high Impact plastic
Controls Touch operated: DISPLAY, AIR, ON/OFF, SHIFT
Warranty One year material and workmanship
Standard Accessories Shoulder strap,Alkaline Batteries, Instruction Manual and Training CD
Optional Accessories Sample draw pump
Sample draw adapter plate
Data connector, CPU adapter type RC-1
Remote repeater alarm
Padded carrying case
Ni-Cd batteries and charger
Calibration kit

Datasheets & User Manuals

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