GX-Force Sample Draw 4 Gas Monitor | RKI

GX-Force Sample Draw 4 Gas Monitor


  • 2 Operating modes
    — Normal and Leak Check
  • Internal sample pump with 100′ sample range
  • 30 hours of operation (Lithium-ion battery)
  • USB Type-C charging & data connection
  • Easy to grip lightweight design
    — 2.5″ W x 6.81″ H x 1.85″ D, 9.87 ounces
  • Water and dust resistant design, IP67
  • Field replaceable sensors & filters
  • Impact resistant body
  • Intrinsically safe
  • Large LCD Auto-backlit display
  • 3 Year warranty

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The GX-Force is RKI’s smallest personal 1-4 gas monitor with a strong internal sample pump capable of a 100’ sampling range. Weighing only 9.8 ounces, the GX-Force can monitor the standard confined space gases (LEL combustibles, Oxygen, Carbon Monoxide, and Hydrogen Sulfide). Utilizing the same micro-sensor technology, which are compatible with the GX-3R, GX-3R Pro, 04 Series, and Gaswatch 3 instruments.

With the GX-Force, you have multiple tools in one instrument. Having 2 operating modes, the GX-Force can be used for confined space, safety monitoring in its Normal Operating mode. A Leak Check mode is the solution for leak investigations. In Leak Check Mode, the GX-Force can monitor for combustibles in the ppm range.

The GX-Force operates 30 hours on a Li-ion battery, and has a large LCD display showing all gas readings, battery level, current time and automatically backlights in alarm conditions. Standard alarm types include vibration, visual, and audible alarms, which can be set to latching or non-latching. Controlled by a microprocessor, the GX-Force continuously checks itself for sensor connections, low battery, circuit trouble, low flow, and calibration errors.

Calibration and bump test intervals and reminders are user adjustable and can be set to either go into alarm or to lock the user out of normal measurement mode once a calibration period has expired. Calibration can be done individually or in a group.


  • Personal monitoring
  • Confined spaces
  • Refineries/petrochemical
  • Utilities
  • Oil and Gas
  • Water/wastewater
  • Fire services
  • Construction


Sampling Method Internal sample pump, flow rate nominal 0.5 LPM, includes 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 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


06-1248RK-03 Calibration kit tubing, polyurethane, 3/16” ID x 5/16” OD, 3 feet

07-2005RK Gasket, filter/screen retaining

07-6063 Gasket between front and back case

07-6064 Filter gasket

07-6065 Charger port rubber cover

10-1133 Screw, M3 x 8mm, pan head, philips, captive, SUS304

13-0112RK Wrist strap

13-0130 Belt clip, GX-Force

17-1001RK Tapered rubber inlet nozzle, 4”

21-1833RK Filter holder, clear plastic

21-1982 Back case assembly, includes captive screws (does not include filter/inlet port)

21-1983 Sensor retainer

21-1984 White chassis for battery and pump

29-6100 Water immersion sensing seal, adhesive backed

33-0159RK Teflon filter disk, 10 pieces

33-1112RK Wire mesh disk filter

33-7130 Scrubber disk filter for CO/H2S sensor (pack of 5)

33-7131 Scrubber disk filter for combustible sensor, CF-6309 (5pcs/pack)

33-7132 Scrubber disk filter, charcoal, for CO & H2 comp CO sensor, CF-A1CP (pack of 5), (not used on CO/H2S combo sensor)

33-7133 Humidity filter disk for H2S or PH3 sensor, CF-A13i (pack of 5)

47-5116 Data downloading cable, USB A to USB C

49-0139 AC adapter, 100 – 240 VAC in, 5.0 VDC 3A out, USB-C connection, charger for GX-Force

49-1633 Battery pack, Li-Ion

49-2022 DC adapter, with vehicle plug and 4ft cable, 12-24 VDC in, 5.0 VCD out, charger for GX-Force

51-1152 LCD module

65-7004 Dummy sensor

80-0172 Probe with hydrophobic filter, dust filter, no scrubber section

80-0404RK Dilution fitting, 50:50

NCR-6309 Sensor, LEL 0-100%

ESR-A13i-H2S Sensor, Hydrogen Sulfide (H2S) 0-200 ppm

ESR-A13P-CO Sensor, Carbon Monoxide (CO) 0-2000 ppm

ESR-A1CP-CO-H Sensor, Carbon Monoxide (CO) 0-2000 ppm with H2 compensation

ESR-A1DP-COHS Sensor, CO/H2S combination, CO 0-2000 ppm, H2S 0-200 ppm

ESR-X13P-OXY Sensor, Oxygen (O2) 0-25% vol

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