GX-3R
The RKI Instruments GX-3R is the world’s smallest 4-gas confined-space monitor for workers in refineries, utilities, oil and gas, and emergency services.
- Woman-owned · HUB-certified
- Tax-exempt & POs accepted
- Calibration & repair
Overview
The GX-3R is the world’s smallest 4 gas monitor weighing only 3.52 ounces (100g) and can comfortably be clipped within a worker’s breathing zone. It simultaneously monitors and displays LEL combustibles, O2, CO (Hydrogen compensated CO also available), and H2S. Features new generation micro sensors with dual filament LEL sensor for silicone poisoning resistance, electrochemical O2 sensor (3-5 year lifespan), and combo H2S/CO sensor. Includes non-compliance indicator that flashes LEDs every 30 seconds if instrument needs bump testing, calibration, or if gas alarm occurred. IP66/68 water and dust resistant. Simple 2-button operation with audible (100dB), visual (LED), and vibration alarms. 25-hour runtime on Lithium-ion battery. 3-year warranty. Applications: confined spaces, personal monitoring, refineries, utilities, oil & gas, water/wastewater, fire services, construction.
- Smallest and lightest 4-gas monitor
- Simultaneous detection of 4 gases: LEL, O2, H2S, and CO
- H2 Compensated CO sensor available
- Simple 2-button operation
- Audible, visual, and vibration alarms
- 3 user-adjustable alarm levels
- 25 hours of operation with lithium-ion battery
- Water and dust resistant design, IP66/68
- Non-compliance indicator with flashing LED status every 30 seconds
- Dual filament LEL sensor for increased resistance to silicone poisoning
- New generation electrochemical O2 sensor with 3 to 5 year lifespan
- H2S and CO combo micro sensor available
- Designed for breathing zone monitoring
- Datalogging capability
- Drop tested to 23 feet
Specifications
| Performance | |
| Gas Detected - Slot 1 | Carbon Monoxide (CO) / H2 Compensated |
| Gas Detected - Slot 2 | Hydrogen Sulfide (H2S) |
| Gas Detected - Slot 3 | Combustible Gases (Methane as standard) / Oxygen |
| Detection Principle - CO | EC |
| Detection Principle - H2S | Dual EC |
| Detection Principle - LEL | Catalytic combustion |
| Detection Principle - O2 | EC |
| Detection Range - CO | 0 ~ 2,000 ppm (1 ppm) |
| Detection Range - H2S | 0 ~ 200.0 ppm (0.1 ppm) |
| Detection Range - LEL | 0 ~ 100% LEL (1% LEL) |
| Detection Range - O2 | 0 ~ 40% Vol. (0.1%) |
| Accuracy - CO | ± 5% of reading or ± 2 ppm CO |
| Accuracy - H2S | ± 5% of reading or ± 5 ppm CO (whichever is greater) |
| Accuracy - H2S (H2S Only) | ± 5% of reading or ± 2 ppm H2S (whichever is greater) |
| Accuracy - LEL | ± 5% of reading or ± 2% LEL (whichever is greater) |
| Accuracy - O2 | ± 0.5% of reading O2 |
| Display | Digital LCD displays with 7 segment plus 14 segment plus icon |
| CO Preset Alarms (User Adjustable) | 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 |
| H2S Preset Alarms (User Adjustable) | 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 |
| LEL Preset Alarms (User Adjustable) | 1st alarm: 10% LEL, 2nd alarm: 25% LEL, 3rd alarm: 50% LEL |
| Overscale Alarm - CO | 2000.0 ppm |
| Overscale Alarm - H2S | 200.0 ppm |
| Overscale Alarm - LEL | 100% LEL |
| Types of Alarms | Gas Alarm: 3 Increasing alarms, STEL, TWA, overscale alarm. O2 decreasing/increasing. Trouble alarm: Sensor disconnection, low battery, circuit error, calibration range error |
| Gas Alarm Display | Flashing LEDs, continuous buzzer (100 db @ 30 cm), flashing gas value, vibration |
| Trouble Alarm Display | Flashing LEDs, intermittent buzzer (95 db @ 30 cm), display of error message |
| Response Time | Within 30 s (T90) |
| Power | |
| Power Source | Lithium-ion battery, Approx. 25 h after a 3 h full charge |
| Physical | |
| Dimension (without rubber boot) | 2.2" W x 2.55" H x 1.02" D (Approx. 58 W x 65 H x 26 D mm) |
| Weight (without rubber boot) | 3.52 oz (approx. 100 g) |
| Dimension (with rubber boot) | 2.4" W x 2.63" H x 1.06" D (Approx. 61 W x 67 H x 27 D mm) |
| Weight (with rubber boot) | 3.70 oz (approx. 105 g) |
| Case Material | Dust and water resistant to IP-66/68 (2m,1h) approval. Drop height 23 ft |
| Connectivity | |
| Datalogging | Logs user ID, station ID, Calibration & Bump Test history, Alarm Events & Alarm Interval Trends |
| Approvals & Warranty | |
| Approvals | ATEX, CSA, IECEx, MED |
| Warranty | Three years material and workmanship |
| Other | |
| Sampling Method | Diffusion sampling standard (hand aspirator or clip-on motorized pump optional) |
| Operating Temperature | -20°C ~ +50°C [-4°F ~ +122°F] (continuous), -40°C ~ +60°C [-40°F ~ +140°F] (temporary, 15 min) |
| Operating Humidity | 10 to 90% RH, non-condensing (continuous); 0 to 95% RH, non-condensing (temporary, 15 min) |
| Controls | Two buttons: POWER / MODE, AIR |
| Standard Accessories | Alligator clip, protective rubber boot, charger, and calibration adapter |
Calibration & repair from FarrWest
Calibration, repair and maintenance for your detection instruments.
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