This product appears in the ERE Air Catalogue 2025
Rolls-Royce
Bureau Veritas
Renouveau La Fontaine
Englobe
National Defence
Government of QuébecOverview
The GX-3R simultaneously monitors and displays LEL combustibles, O2, CO (H2 compensated CO also available) and H2S. The LEL sensor has a unique design with two active filaments in one sensor to increase its resistance to silicone poisoning. If one filament gets poisoned the second filament takes over.
Applications
• Personal monitoring
• Confined spaces
• Refineries / petrochemical
• Oil & gas
• Utilities
• Hazardous material
• Water/waste water treatment
• Fire services
• Construction
Features
• Simultaneous detection of 4 gases: LEL, O2, H2S & CO (H2 Compensated CO sensor available)
• Simple 2-button operation
• 3 user adjustable alarm levels
• Audible, visual & vibration alarms
• Non-compliance indicator
• Large LCD Auto-backlit display
• Field replaceable sensors & filters
• Impact resistant body with removable rubber boot
• Water and dust resistant design, IP66/68
Kit Includes
• GX-3R monitor
• Wrist strap
• Alligator clip
• Rubber boot
• Calibration adapter
• Li-Ion battery pack
• 100-240 VAC charger
*Other configurations are also available
*Optional RP-3R clip-on sample drawing pump also available.
• Low Cost of Ownership
• RKI instruments are designed to deliver reliable performance while minimizing long-term costs.
Their low cost of ownership comes from a combination of durability, efficiency, and ease of maintenance.
• Long sensor lifespan
• Sensors 3 year warranty
• Perform Better than the Competition
• Minimal maintenance requirements
• User friendly replaceable parts
• Energy efficiency
• Durable construction
• Reduced calibration costs
| Model | GX-3R | |||||
| Gas Detected | Carbon Monoxide (CO) H2 Compensated | Carbon Monoxide (CO) | Hydrogen Sulfide (H2S) | Hydrogen Sulfide (H2S) Only | Combustible Gases (Methane (CH4) as standard | Oxygen (O2) |
Dual Sensor | ||||||
| Sensor Slot | 1 | 2 | 3 | |||
| Detection Principal | Electrochemical Cell | Dual Electrochemical Cell | Electrochemical Cell | Catalytic Combustion | Electrochemical Cell | |
| Detection Range (Increments) | 0 ~ 2,000 ppm (1 ppm) | • 0 ~ 2,000 ppm CO (1 ppm) • 0 ~ 200.0 ppm H2S (0.1 ppm) | 0 ~ 200.0 ppm H2S (0.1 ppm) | 0 ~ 100% LEL (1% LEL) | 0 ~ 40.0% Vol. (0.1% Vol.) | |
Accuracy (Whichever is greater) | ± 5% of reading or ± 2 ppm CO | • ± 5% of reading or ± 5 ppm CO • ± 5% of reading or ± 2 ppm H2S | ± 5% of reading or ± 2 ppm H2S | ± 5% of reading or ± 2% LEL | ± 5% CO2 | |
| Power Source | Li-Ion battery pack | |||||
| Sampling Method | Diffusion sampling standard / hand aspirator or motorized pump optional | |||||
| Operating Temp. & Humidity | -20°C ~ +50°C [ -4°F ~ +122°F ], 10 to 90% RH, non-condensing (continuous environment) | |||||
| Safety Rating | ATEX, CSA (Pending) | |||||
| Part Number | Model |
| RK-72-RA-C | GX-3R 4-Gas Personal Monitor For LEL/O2/Combo H2S & CO With Li-Ion Battery Pack & 100-240 VAC Charger |
Compare models
Your selection is highlighted. Select a row to switch.| Accessories & Calibration Equipment | |
| Part Number | Description |
| RK-81-SDM3R101 | SDM-3R Calibration Station With 1 Solenoid, AC Adapter, Flash Drive, USB Cable & Tubing |
| NLB-Z105325PM51 | Calibration Gas 25 PPM H2S / 50 PPM CO / 2.5% CH4 (50% LEL) / 12% O2 In N2, 58 Liter Aluminum Cylinder With CGA C-10 |
| NLB-513 | 0.25 LPM Regulator With Gauge & Knob For Cylinders With CGA C-10 |
| RK-06-1248RK-03 | 3/16" O.D. x 5/16" I.D. Polyurethane Calibration Tubing, 3 ft |
| NLB-505 | Case For 58 / 103 / 116 Liter Aluminum Cylinders, Holds 2 Cylinders |
| PC-915-1001 | Black NANUK™ Case 915 With Cubed Foam (Other Colors Available Upon Request) |
Documents
Calibration and repair
Send it to our Montreal service team. We evaluate the instrument and send a detailed quote before any work starts.
Questions, answered
How fast will I get a price?
Send the quote request and a specialist replies within 4 business hours, Monday to Friday, 8:00 to 4:30 ET.
Can we pay on account or by purchase order?
Yes. With established credit, terms are Net 30 days, and you can send your purchase order with the quote request. We also accept Visa, Mastercard and American Express.
How is shipping charged?
On quotes and account orders, freight is F.O.B. Montréal: the carrier charge is worked out at shipment from the packed weight and dimensions, and added to your invoice. In-stock items can also be picked up the same day in Montréal (8605 rue du Champ-d'Eau).
Can I return it?
Yes, within 30 days of purchase, with a return authorization number from customer service first. A 25% restocking fee applies, unless it is a defect covered by the warranty. Special orders, hazardous materials, flammable liquids and gases can't be returned. Return policy
Can ERE calibrate or repair it?
Yes. Our Montréal service shop calibrates and repairs it in-house. Request service
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