This product appears in the ERE Air Catalogue 2025
Rolls-Royce
Bureau Veritas
Renouveau La Fontaine
Englobe
National Defence
Government of QuébecOverview
The GasWatch 3 is the world’s smallest and lightest single gas and dual gas monitor designed to detect CO, H2S, O2, CO/O2 & H2 Compensated CO. Its compact form provides great comfort and flexibility in how you choose to wear it. It can be worn on your wrist as a watch, or clipped into your breathing zone on your lapel, hard hat or other safety equipment with the 360º rotation alligator clip.
Applications
• Refineries
• Petrochemical facilities
• Sewage treatment plants
• Fire departments
• Chemical plants
• Tunnels
• Mines
• Hazardous waste sites
Features
• Light and compact "watch type" design
• Easily worn clipped in your "breathing zone"
• Available with watch band or alligator clip
• Automatic backlight during alarm
• Sturdy IP-66/68 rated design
• Water, dust and radio frequency (RF) resistant
• Non-compliance indicator
Kit Includes
• GasWatch 3 monitor
• Watch band or alligator clip
• Spring pins (used to mount accessories on to the rear face)
• CR2450 coin-type lithium-ion battery
*GasWatch 3 with alligator clip models 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 Name | GW-3 (HS) | GW-3 (CO) | GW-3 (C-) | GW-3 (CX) | GX-3 (O2) | |
| Gas Detected | Hydrogen Sulfide | Carbon Monoxide | H2 Compensated CO | Carbon Monoxide | Oxygen | Oxygen |
| Detection Principal | Electrochemical | Dual Electrochemical | Galvanic Cell | |||
| Detection Range (Increments) | 0 ~ 30 ppm (0.1 ppm) 30 ~ 100 ppm (1 ppm) | 0 ~ 300 ppm | 0 ~ 25.0% Vol. | |||
| Gas Sampling | Diffusion | |||||
| Power Source | CR2450 coin-type lithium ion battery | |||||
| Operating Temp. & Humidity | -20°C to +50°C (no sudden changes) | -20°C to +50°C | ||||
| Safety Rating | ATEX, IECEx, CSA | |||||
| Accessories & Calibration Equipment | |
| Part Number | Description |
| NLB-F105325PN | Calibration Gas 25 PPM H2S In N2, 34 Liter Steel Cylinder With CGA 600 |
| NLB-H101650PN | Calibration Gas 50 PPM CO In N2, 34 Liter Steel Cylinder With CGA 600 |
| NLB-H1049200PA | Calibration Gas 200 PPM H2 in Air, 34 Liter Steel Cylinder With CGA 600 |
| NLB-H1066 | Calibration Gas 100% N2, 34 Liter Steel Cylinder With CGA 600 |
| NLB-417 | 0.5 LPM Regulator With Gauge & Knob For Cylinders With CGA 600 |
| NLB-517 | 0.5 LPM Regulator With Gauge & Knob For Cylinders With CGA C-10 |
| RK-81-1194 | Calibration Adapter For GasWatch 3 |
| RK-06-1248RK-03 | 3/16" O.D. x 5/16" I.D. Polyurethane Calibration Tubing, 3 ft |
| NLB-500D | Case For 17 / 29 / 34 Liter Steel Cylinders, Holds 2 Cylinders |
Compare models
Your selection is highlighted. Select a row to switch.| Part Number | Description | Model | Detection Range (Increments) | Calibration Equipment |
| RK-73-0022-01 | GasWatch 3 For H2S With Wrist Band | GW-3 (HS) | 0 ~ 30 ppm 30 ~ 100 ppm | • NLB-F105325PN • NLB-517 • RK-81-1194 • RK-06-1248RK-03 • NLB-500D |
| RK-73-0023-01 | GasWatch 3 For CO With Wrist Band | GW-3 (CO) | 0 ~ 300 ppm | • NLB-H101650PN • NLB-417 • RK-81-1194 • RK-06-1248RK-03 • NLB-500D |
| RK-73-0025-01 | GasWatch 3 For CO With H2 Compensated Sensor & Wrist Band | GW-3 (C-) | 0 ~ 300 ppm | • NLB-H101650PN • NLBH1049200PA • NLB-417 • RK-81-1194 • RK-06-1248RK-03 • NLB-500D |
| RK-73-0026-01 | GasWatch 3 For CO/O2 Combination With Wrist Band | GW-3 (CX) (Dual Sensor) | CO: 0 ~ 300 ppm O2: 0 ~ 25.0% Vol. | • NLB-H101650PN • NLB-H1066 • NLB-417 • RK-81-1194 • RK-06-1248RK-03 • NLB-500D |
| RK-72-0012-01 | GasWatch 3 For O2 With Wrist Band | GX-3 (O2) | 0 ~ 25.0% Vol. | • NLB-H1066 • NLB-417 • RK-81-1194 • RK-06-1248RK-03 • NLB-500D |
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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