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 Pro simultaneously monitors and displays 5 different gases. In addition to monitoring standard confined space gases LEL, O2, CO, & H2S, the GX-3R Pro has a 5th channel where you can add infrared or toxic sensors. Two of the four sensor slots have interchangeable sensors providing flexible configurations, which can easily be changed in the field.
The GX-3R Pro utilizes Bluetooth communication to display direct gas readings from the instrument to a phone app, which is available free on either iOS or Android phones. Automatic notifications can be programmed to send text or email messages, if there is an alarm event from the GX-3R Pro.
Applications
• Personal monitoring
• Confined spaces
• Refineries / petrochemical
• Utilities
• Oil & gas
• Water/waste water treatment
• Fire Services
• Law Enforcement
• Construction
Features
• Simultaneous detection of 5 gases
• LEL, O2, H2S, CO, and other optional sensors
• H2 Compensated CO sensor available
• Simple 2-button operation
• Bluetooth communication with iOS & Android App
• 3 user adjustable alarm levels
• Panic alarm (tap instrument twice)
• Man down alarm
• Non-compliance indicator
• Large full dot, auto-backlit display with auto-rotation
• Stealth mode for law enforcement
• 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 Pro | ||||||||||
| Gas Detected | Hydrogen Sulfide / Carbon Monoxide (H2S / CO) | Hydrogen Sulfide (H2S) Only | Carbon Monoxide (CO) H2 Compensated | Combustible Gases (Methane) / Hydrocarbons (CH4 / HC) | Oxygen (O2) | Hydrogen Cyanide (HCN) | Nitrogen Dioxide (NO2) | Sulfur Dioxide (SO2) | Carbon Dioxide % (CO2) | Carbon Dioxide ppm (CO2) | |
| Sensor Slot | 1: Carbon Monoxide (CO) & Hydrogen Sulfide (H2S) *Interchageable | 2: Combustible Gases (Methane (CH4) as standard) | 3: Oxygen (O2) | 4: Toxics & CO2 | |||||||
| Detection Principal | Dual Electrochemical Cell | Electrochemical Cell | Catalytic Combustion | Electrochemical Cell | Infrared | ||||||
Detection Range (Increments) | 0 ~ 2000 ppm (1 ppm) | 0 ~ 200.0 ppm (0.1 ppm | 0 ~ 200.0 ppm (0.1 ppm) | 0 ~ 2,000 ppm | 0 ~ LEL (1% LEL) | 0 ~ 40.0% Vol. (0.10%) | 0 ~ 30.0 ppm (0.1 ppm) | 0 ~ 20.00 ppm (0.05 ppm) | 0 ~ 100.0 ppm (0.05 ppm) | 0 ~ 10.0% Vol. (0.01%) | 0 ~ 10,000 ppm (20 ppm) |
Accuracy (Whichever Is Greater) | ± 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 ppm CO | ± 5% of reading or ± 2 % LEL | ± 0.5% O2 | ± 10% of reading or ± 5 % of full scale | ± 5% of reading or ± 2 ppm | |||
| Sampling Method | Diffusion sampling standard (hand aspirator or clip-on motorized pump optional) | ||||||||||
Power Source (Configurable) | Li-ion or Alkaline | ||||||||||
| Operating Temp. & Humidity | -20°C ~ +50°C [ -4°F ~ +122°F ] 10 to 90% RH, non-condensing (continuous environment) | ||||||||||
-40°C ~ +60°C [ -40°F ~ +140°F ] 0 to 95% RH, non-condensing (temporary environment) | |||||||||||
| Bluetooth Communication | BLE: with iOS and Android phone app: RK Link | ||||||||||
| Safety Rating | ATEX, CSA | ||||||||||
| Accessories & Calibration Equipment | |
| Part Number | Description |
| RK-81-SDM3R201 | SDM-3R Calibration Station With 2 Solenoids (For 2 Cylinders), 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-Z10135000PN | Calibration Gas 5000 PPM CO2 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) |
Compare models
Your selection is highlighted. Select a row to switch.| Part Number | Description | Calibration Equipment |
| RK-72-PAA-C | GX-3R Pro 5-Gas Personal Monitor For LEL/O2/Combo H2S & CO/ppm CO2 With Li-Ion Battery Pack & 100-240 VAC Charger | • NLB-Z105325PM51 • NLB-Z10135000PN • NLB-513 • RK-06-1248RK-03 • NLB-505 |
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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