GX-3R
Portable 4-Gas Detector
The GX-3R by Riken Keiki is the world’s smallest and lightest 4-gas monitor, weighing just 99.7 grams and small enough to clip comfortably within a worker’s breathing zone. Using a new generation of microsensors, the GX-3R simultaneously monitors LEL, O2, CO and H2S with a unique dual-filament LEL sensor that maintains detection capability even when one filament is affected by silicone poisoning. With 25 hours of runtime on a 3-hour charge, IP66/68 ingress protection, a 23-foot drop rating and a 3-year warranty on both the instrument and sensors, the GX-3R delivers more durability and reliability than any other 4-gas monitor in its size class.
KEY BENEFITS
- World's smallest and lightest 4-gas monitor at 99.7 grams: small enough to clip within the worker's breathing zone
- Dual-filament LEL sensor: if one filament is poisoned by silicone, the second takes over automatically
- O2 sensor electrochemical with 3 to 5 year lifespan
- H2S and CO available as a combo microsensor
- 25 hours of operation on a 3-hour Li-ion charge
+ more in the Description tab below
The World’s Smallest 4-Gas Monitor. Worn in the Breathing Zone.
WHS defines the breathing zone as the ten-inch radius around a worker’s nose and mouth. Most 4-gas monitors are too large and heavy to be worn consistently in this zone throughout a shift. The GX-3R was designed specifically to solve this problem. At 99.7 grams and 55.9 x 64.8 x 25.9 mm, it is the smallest and lightest 4-gas monitor in the world, small enough to clip to a lapel or collar and comfortable enough to forget it is there for an entire shift.
This matters because gas monitoring accuracy depends on where the instrument is worn. A monitor clipped to a belt or tool bag is not sampling the air the worker is breathing. The GX-3R is small enough that workers actually wear it where it is most effective, which means the gas readings it reports are the readings that matter.
Dual-Filament LEL Sensor Technology
The GX-3R’s LEL sensor contains two active filaments in a single sensor housing. The standard filament handles normal detection. If it becomes desensitised over time or poisoned by silicone exposure, the instrument automatically switches to the second silicone-resistant filament and alerts the user with an HC Gas List message. Detection continues without the sensor needing immediate replacement, reducing downtime in the field.
A hydrogen-compensated CO sensor is also available, reducing false alarms in environments where hydrogen gas is present alongside carbon monoxide.
Long Runtime. Wide Range of Accessories.
The GX-3R operates for 25 hours on a single 3-hour Li-ion charge, providing more than a full shift of runtime with capacity to spare. For confined space pre-entry sampling without entering the hazard zone, the optional RP-3R motorised sample draw pump attaches to the GX-3R and supports tubing up to 12 metres in length. For fleet management, the SDM-3R calibration station can be used standalone with a USB flash drive or PC-controlled to manage up to 10 instruments simultaneously, with automated calibration, bump testing, alarm checking and data archiving.
Built to Survive the Field
The GX-3R’s impact-resistant body is rated for drops from 23 feet (7 metres), far exceeding the 1-metre drop ratings of competing 4-gas monitors. IP66/68 protection covers both high-pressure water jets and submersion to 2 metres for 1 hour. Operating temperature ranges from -40°C to 60°C. The combination of small size, long runtime, extreme durability and a 3-year warranty on both the instrument and sensors makes the GX-3R one of the best value 4-gas monitors available for Australian and international operations.
Benefits
- World's smallest and lightest 4-gas monitor at 99.7 grams: small enough to clip within the worker's breathing zone
- Dual-filament LEL sensor: if one filament is poisoned by silicone, the second takes over automatically
- O2 sensor electrochemical with 3 to 5 year lifespan
- H2S and CO available as a combo microsensor
- 25 hours of operation on a 3-hour Li-ion charge
- IP66/68 dust and water resistant to 2 metres for 1 hour, drop rated to 23 feet (7 metres)
- Dual audible alarm ports (95 dB at 30 cm) with LEDs on 3 sides for multi-direction visibility
- Non-compliance indicator flashes LEDs every 30 seconds when bump test is overdue, calibration is due or a gas alarm has occurred
- STEL and TWA readouts
- Large capacity data logging standard: 8 alarm trends, adjustable log interval, 100 calibration records
Dimensions
58 x 65 x 26 mm without rubber boot. 61 x 67 x 27 mm with rubber boot.
Weight
100 g without rubber boot. 105 g with rubber boot.
Display
Large LCD with 7-segment, 14-segment and icon display. Auto backlight at alarm
Keypad
Two buttons
Sampling
Diffusion. Optional hand aspirator or motorised pump (RP-3R)
Response time
T90 within 30 seconds
Battery
Rechargeable Li-ion
Runtime
-40°C to 60°C
Humidity
0 to 95% RH non-condensing
IP rating
IP66/68 (2 m for 1 hour)
Drop rating
23 feet (7 metres)
Alarms
Dual audible 95 dB at 30 cm, 3 visual LEDs on 3 sides of the instrument, vibration. STEL and TWA alarms.
Non-compliance indicator
LEDs flash every 30 seconds when bump test or calibration is overdue, or after a gas alarm event
Data logging
Automatic at 5-minute intervals for 300 hours. Adjustable. 8 alarm trends, 100 calibration records. Logs user ID, station ID, calibration and bump test history, alarm events and alarm trends
Data download
USB to IrDA cable (optional)
Certifications
ATEX: I M1 Ex da ia I Ma / II 1G Ex da ia IIC T4 Ga. IECEx. CSA. TIIS
Warranty
3 years on instrument and sensors
Carbon Monoxide
CO
Hydrogen Sulphide
H2S
Combustible Gas
LEL
Oxygen
O2
- Aviation & Transportation
- Chemical Manufacturing
- Confined Space & Compliance
- Energy (Oil & Gas)
- Food & Beverage
- Landfill & Remediation
- Marine & Maritime
- Medical & Healthcare
- Mining & Minerals
- Power Generation & BESS
- Technology & Semiconductor
- Water & Wastewater
The GX-3R uses a dual-filament LEL sensor with two active filaments in a single housing. If the standard filament becomes desensitised or affected by silicone poisoning, the instrument automatically switches to the second silicone-resistant filament and alerts the user. Detection continues without immediate sensor replacement, reducing field downtime.
Yes. At 99.7 grams and 55.9 x 64.8 x 25.9 mm, the GX-3R is the smallest and lightest 4-gas monitor in the world and is small enough to clip to a worker's collar or lapel, within the breathing zone as defined by OSHA.
Yes. The optional RP-3R motorised sample draw pump attaches to the GX-3R and supports tubing up to 12 metres for confined space pre-entry atmosphere testing without entering the hazard zone.
The H2 compensated CO sensor reduces cross-sensitivity to hydrogen gas, preventing false CO alarms in environments where both H2 and CO may be present, such as battery charging areas or fuel cell applications.
The SDM-3R is a docking station designed for the GX-3R and GX-3R Pro. It can be used standalone with a USB flash drive for single-unit calibration and data storage, or PC-controlled to manage up to 10 instruments simultaneously for bump testing, calibration, alarm checking and data archiving.
The GX-3R carries a 3-year warranty on both the instrument and sensors, which is significantly longer than the 2-year warranties offered by most comparable 4-gas monitors.
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