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RKI GX-Force Portable 4 Gas Detector

The GX-Force Portable 4 Gas Detector is a rugged and reliable device for monitoring LEL combustibles, O2, CO, and H2S. An internal sample pump, USB charging, and field-replaceable sensors make it a great choice for industrial and field applications.

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Article number: 72-FA-A-A10
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  • Versatile operating modes: Normal sample draw and leak check modes for efficient and accurate gas detection. 
  • Wide sample range: Features an internal sample pump of up to 100 feet for flexible and convenient gas monitoring of LEL combustibles, oxygen, carbon monoxide, and hydrogen sulfide. 
  • Long battery life: Up to 30 hours of operation on a single charge, thanks to the reliable lithium-ion battery. 
  • Convenient charging and data transfer: USB type-C connection for fast and easy charging and data transfer. 
  • Ergonomic design: Lightweight and easy to grip, with dimensions of 2.5″ W x 6.81″ H x 1.85″ D and a weight of just 9.87 oz. 
  • Robust and reliable: IP67-certified water and dust-resistant design, with field-replaceable sensors and filters for extended use. 
  • Clear and easy-to-read display: Large LCD auto-backlit display for clear and accurate readings, even in low light conditions. 
  • Peace of mind: Comes with a three-year warranty for added confidence and assurance.


Sampling Method Internal sample pump, flow rate nominal 0.5 LPM, includes a hydrophobic filter.
Suction Flow Rate Minimum 0.35 L/min (open flow rate)
Gas Alarm Pattern Lamp flashing, continuous modulating buzzer sounding, gas concentration display flashing, vibration.
Gas Alarm Reset Operation Self-resetting or latching
Fault Alarm/Self-Diagnosis System, clock, or sensor abnormality; battery voltage drop; calibration failure;
pump abnormality; low flow rate
Fault Alarm Pattern Lamp flashing, intermittent buzzer sounding, detail display
Fault alarm reset operation Self-resetting
Display LCD digital (7-segment + 14-segment + icons) with backlight
Individual Operations Operational status, clock, battery level, peak reading, pump status, calibration notification
Sound Pressure Approx. 90 dB (30 cm)
Data Logger Function Maximum storage capacity: 3,600 items. Interval: 5 minutes (adjustable)
Communication Specifications USB, 2.0 (for data logger) Connector: Type-C
Power Source Rechargeable lithium-ion battery, USB Type-C power cord
Continuous Operating Time Approx. 30 hours (25 °C, fully charged, no alarm, no backlight)
Operating Ambient
Temperature /Humidity Range
-20 °C to +50 °C (no sudden changes), 0 – 95 % RH (no condensation)
(-4 °F to +122 °F)
Approvals Intrinsically safe construction


IECEx (Ex da ia IIC T4 Ga/Ex ia IIC T4 Ga)

ATEX (II1G Ex da ia IIC T4 Ga/II1G Ex ia IIC T4 Ga)

Certifications ATEX / IECEx, QPS (pending)
Protection Level IP67 equivalent
External Dimensions / Weight Approx. 2.52 (W) × 6.81 (H) × 1.85 (D) (excluding protrusions) / Approx. 9.87 oz.
Warranty Three years of material and workmanship


Detection target gas

Combustible gas
(CH4 or HC)


Carbon monoxide

Hydrogen sulfide

Detection principle

Catalytic combustion

Electrochemical type

Detection range

0 – 100 % LEL

0.0 – 40.0 vol %

0 – 2,000 ppm

0.0 – 200.0 ppm


1 % LEL

0.1 vol %

1 ppm

0.1 ppm

Alarm setpoints


(User-defined setting)

1st alarm: 10 % LEL


2nd alarm: 25 % LEL

3rd alarm: 50 % LEL

OVER alarm: 100 % LEL

L alarm: 19.5 vol %


LL alarm: 18.0 vol %

H alarm: 23.5 vol %

OVER alarm: 40.0 vol %

1st alarm: 25 ppm


2nd alarm: 50 ppm

3rd alarm: 1200 ppm

TWA alarm: 25 ppm

STEL alarm: 200 ppm

OVER alarm: 2,000 ppm

1st alarm: 5.0 ppm


2nd alarm: 30.0 ppm

3rd alarm: 100.0 ppm

TWA alarm: 1.0 ppm

STEL alarm: 5.0 ppm

OVER alarm: 200.0 ppm

Response time (T90)

CH4: Within 30 seconds,

HC: Within 40 seconds

Within 20 seconds

Within 30 seconds

Within 30 seconds

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