GX-Force Sample Draw 4 Gas Monitor

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).  Built around high-quality micro-sensor technology, which are compatible with the GX-3R, GX-3R Pro, 04 Series, and Gaswatch 3 instruments.

As low as $720.00
1-2 week lead time from the manufacturer


Compact and Lightweight: The GX-Force is RKI’s smallest personal gas monitor, weighing only 9.8 ounces, making it easy to carry and wear.

Strong Internal Sample Pump: It features a strong internal sample pump capable of a 100' sampling range, allowing for versatile use in various environments.

Gas Monitoring Capability: The GX-Force can monitor the standard confined space gases, including LEL combustibles, Oxygen, Carbon Monoxide, and Hydrogen Sulfide.

Compatibility: It is compatible with other RKI instruments, such as the GX-3R, GX-3R Pro, 04 Series, and Gaswatch 3, offering flexibility in instrument selection.

Dual Operating Modes: The GX-Force has two operating modes - Normal Operating mode for confined space and safety monitoring, and a Leak Check mode for leak investigations.

Long Battery Life: It operates for up to 30 hours on a Li-ion battery, ensuring extended use without frequent recharging.

Comprehensive Display: The large LCD display provides clear visibility of gas readings, battery level, current time, and automatically backlights in alarm conditions.

Alarm Options: It offers standard alarm types, including vibration, visual, and audible alarms, which can be set to latching or non-latching as per user preferences.

Self-Check and Diagnostics: The GX-Force continuously checks itself for sensor connections, low battery, circuit trouble, low flow, and calibration errors, ensuring accurate and reliable operation.

Flexible Calibration: Users can adjust calibration and bump test intervals and reminders, and the instrument can be set to go into alarm or lock the user out of normal measurement mode once a calibration period has expired. Calibration can be done individually or in a group.

Leak Check Mode: In Leak Check Mode, the GX-Force can monitor for combustibles in the ppm range, making it suitable for leak detection applications.


- Personal monitoring

- Confined spaces

- Refineries/petrochemical

- Utilities

- Oil and Gas

- Water/wastewater

- Fire services

- Construction



10 seconds = 10 hours

5 minutes = 300 hours

10 minutes = 600 hours

- Maximum storage capacity: 3,600 items

- Interval: 5 minutes (adjustable)




Gas: Detection Range: Alarm Set Points: Continuous Operation:
Carbon Monoxide (CO) 0-2000 ppm


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


30 hours
Hydrogen Sulfide (H2S) 0-200 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


30 hours
Combustible Gases 0-100% LEL


1st alarm: 10 % LEL

2nd alarm: 25 % LEL

3rd alarm: 50 % LEL

OVER alarm: 100 % LEL


30 hours
Oxygen (O2) 0-40% Vol


L alarm: 19.5 vol %

LL alarm: 18.0 vol %

H alarm: 23.5 vol %

OVER alarm: 40.0 vol %


30 hours



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

Common Specifications:

Sample Method


Internal sample pump, flow rate nominal 0.5 LPM, includes hydrophobic filter


Suction Flow Rate


Minimum 0.35 L/min (open flow rate)




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)


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)



- Spec Sheet

- Manual

- Datalogging Manual


More Information
Manufacturer RKI Intruments
Rental Period Weekly
Description The GX-Force is RKI’s smallest personal 1-4 gas monitor with a strong internal sample pump capable of a 100’ sampling range.
Call For Price Yes
Gas Carbon Monoxide (CO), Combustible, Hydrogen Sulfide (H2S), Oxygen (O2)
4-20 mA Output No
Field Replaceable Sensor No
Min, Max, Avg No
Voltage Output None
Datalogging No
Rechargeable Yes
Field Replaceable Battery Yes
Warranty 1 Year
Audible Alarm Yes
Features The GX-Force is RKI’s smallest personal 1-4 gas monitor with a strong internal sample pump capable of a 100’ sampling range
Minimum Range Gas Dependent
Mobile Fixed
weight 10 oz
Standard Range Gas Dependent
Alarms Gas Alarm and Trouble Alarm
Calibration Field Calibration
Sensor Life 2 years
Sampling Method Fan
Range Gas Dependent
Unit Features

- 2 Operating modes (Normal and Leak Check)

- Internal sample pump with 100′ sample range

- 30 hours of operation (Lithium-ion battery)

- Field replaceable sensors & filters

Sensor Range

Gas Dependent

Resolution Gas Dependent
Integrated Relays Yes
Sensor Range

Gas Dependent

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