SKU: RKI01-72-RA-C

RKI GX-3R 4 Gas Confined Space Monitor 72-RA-C

$512.00

Ships next business day

Description

The RKI GX-3R price will increase to $544 on October 1, 2026. Order by September 30 to lock in current pricing.

Purchase the RKI GX-3R Bundle that includes both the calibration kit and RKI GX-3R 4 Gas Monitor 72-RA-C and receive $50 off the calibration kit. Discount applied automatically at checkout.

RKI GX-3R 4 Gas Confined Space Monitor (ATEX/CSA approved) is the smallest, and lightest CS Gas Monitor and includes a 3-year warranty on the monitor and sensors.

Weighing only 3.52 ounces, it clips comfortably within a worker's breathing zone. It simultaneously monitors and displays LEL combustibles, O2, CO, and H2S. H2S and CO are now available in a combo micro sensor. The LEL sensor has a unique design with two active filaments in one sensor to increase it’s resistance to silicone poisoning. If one filament gets poisoned the second filament takes over. The new O2 sensor is electrochemical with a 3 to 5 year life span.

Safety supervisors will appreciate the non-compliance indicator. The instrument flashes it’s 3 LED lights every 30 seconds.

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

Key Features:

Smallest & lightest 4 gas monitor (2.2" W x 2.55" H x 1.02" D, 3.52 ounces)
3-Year warranty on the monitor and sensors
ATEX/CSA Safety Approval
Simultaneous detection of 4 gases (LEL, O2, H2S & CO)
Simple 2-button operation
Non-Compliance Indicator
3 user adjustable alarm levels: audible, visual, & vibration
Impact resistant body with removable rubber boot
Large LCD Auto-backlit display
Approximately 25 hours of operation (Lithium-ion battery) after a 3 hour charge
Field replaceable sensors & filters
Water and dust resistant design, IP66/68
Stealth mode for law enforcement
Standard Accessories Included: Alligator clip, protective rubber boot, charger, and calibration adapter
Updated version of the GX-2009 (Unlike the GX-2009, the GX-3R uses a 0.25 Regulator.)

Remember to calibrate every three months and regularly perform bump tests.

Carbon Monoxide (CO)

Detection Range: 0 ~ 2,000 ppm (1 ppm)
± 5% of reading or ± 2 ppm CO
Preset Alarms:
- 1st alarm: 25.0 ppm
- 2nd alarm: 50.0 ppm
- 3rd alarm: 1200.0 ppm
- TWA alarm: 25.0 ppm
- STEL alarm: 200.0 ppm
- Over alarm: 2000.0 ppm

Hydrogen Sulfide (H2S)

Detection Range: 0 ~ 200.0 ppm (0.1 ppm)
Accuracy Statement: ± 5% of reading or ± 2 ppm H2S (whichever is greater)
Preset Alarms:
- 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

Combustible Gases (Methane as standard)

Detection Range: 0 ~ 100% LEL (1% LEL)
Accuracy Statement: ± 5% of reading or ± 2% LEL (whichever is greater)
Preset Alarms:
- 1st alarm: 10% LEL
- 2nd alarm: 25% LEL
- 3rd alarm: 50% LEL
- Over alarm: 100% LEL

Oxygen (O2)

Detection Range: 0 ~ 40.0% Vol. (0.1%)
Accuracy Statement: ± 0.5% O2
Preset Alarms:
- Low 1 alarm: 19.5% Low
- 2 alarm: 18.0%
- High alarm: 23.5%
- Over alarm: 40.0%

Brochure:

Specification Sheet:

Quick Reference guide:

Manual:

Datalogging Manual:

Optional Accessory: Downloading cable, USB / IrDA adapter, 0.25 Regulator, RP-3R sample drawing pump, 12-24 VDC adaptor w/vehicle plug.

Part Numbers:
72-RA-C - Gas Monitor with 100-240 VAC charger

Frequently Asked Questions

What makes the RKI GX-3R so compact and wearable?

The RKI GX-3R weighs only 3.52 ounces and measures 2.2" W x 2.55" H x 1.02" D, making it the smallest and lightest 4-gas monitor available. An included alligator clip positions it within a worker's breathing zone without restricting movement—critical for confined space entry and personal monitoring all day long.

How long does the GX-3R battery last between charges?

A fully charged lithium-ion battery provides approximately 25 hours of continuous operation after a 3-hour charge. The battery is rechargeable and the monitor ships with a 100-240 VAC charger. An optional alkaline battery pack is available for remote sites without charging infrastructure.

What makes the GX-3R so widely adopted in confined space programs?

The combination of small size, long warranty, and rugged construction drives adoption. With tens of thousands of units in the field, our factory-authorized service center seldom sees problems within the 3-year warranty period. The non-compliance indicator—flashing every 30 seconds when the monitor is on—also gives supervisors visual confirmation that instruments are active.

How does the GX-3R differ from the older GX-2009?

The GX-3R is the updated successor to the GX-2009. Key improvements include a 3-year warranty on both the monitor and sensors (versus a shorter warranty on the GX-2009), a new dual-filament LEL sensor that resists silicone poisoning, and compatibility with the 0.25 LPM regulator (the GX-2009 used a different regulator). The GX-3R also works with the SDM-3R automated calibration docking station.

Who services the RKI GX-3R?

PK Safety is an RKI Factory Authorized Service Center, making us one of the few distributors qualified to perform in-warranty and out-of-warranty repairs on the GX-3R and the broader RKI instrument line. Most warranty repairs are resolved at no cost to the customer. Contact us at 800.829.9580 to discuss service options.