GX-3R / GX-3R Pro

Overview

The GX-3R is the worlds smallest 4 gas monitor weighing only 3.52 ounces and can comfortably be clipped within a worker’s breathing zone (2.2” W x 2.55” H x 1.02” D). It simultaneously monitors and displays LEL combustibles, O2, CO (Hydrogen compensated CO also available), and H2S.

The GX-3R represents the latest evolution of gas detection technology utilizing a new generation of micro sensors. 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. H2S and CO are now available in a combo micro sensor.

Safety supervisors will appreciate the non-compliance indicator. The instrument flashes it’s 3 LED lights every 30 seconds in the following conditions; if the instrument has not been bump tested, or if calibration is due, or if there was a gas alarm event. The 3 LED lights will continue to flash once every 30 seconds until the non-compliance condition has been resolved. The 30 second interval is adjustable.

OSHA defines the breathing zone as a ten inch radius around the worker’s nose and mouth, and requires that worker exposure monitoring air samples be collected in the breathing zone. Air sampling filters may be attached to the collar or lapel. Traditionally this means only a single gas monitor would be small enough for a worker to practically wear a gas monitor ‘In the breathing zone’. Now there is a 4 gas monitor smaller than many single gas monitors.

Features

Smallest & lightest 4 gas monitor
Simultaneous detection of 4 gases; LEL, O2, H2S & CO
H2 Compensated CO sensor available
Simple 2-button operation
Alarms: audible, visual, & vibration
3 user adjustable alarm levels
25 hours of operation (Lithium-ion battery)
Water and dust resistant design, IP66/68
3 Year warranty

Applications

Personal monitoring
Confined spaces
Refineries/petrochemical
Utilities
Oil and Gas
Water/Wastewater
Fire Services
Construction

Specifications

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General Specifications

General Specifications- GX-3R
Gas Deteced(CO) H2 CompensatedCarbon Monoxide(CO)Hydrogen Sulfide(H2S)H2S OnlyCombustible Gases (Methane as standard)Oxygen (O2)
Dual SensorDual Sensor
Sensor Slot111123
Detection PrincipleECDual ECDual ECECCatalytic combustionElectrochemical cell
Detection Range (Increments)0 ~ 2,000 ppm (1 ppm)0 ~ 2,000 ppm (1 ppm)0 ~ 200.0 ppm (0.1 ppm)0 ~ 200.0 ppm (0.1 ppm)0 ~ 100% LEL (1% LEL)0 ~ 40.0% Vol. (0.1%)
Accuracy Statement± 5% of reading or ± 2 ppm CO± 5% of reading or ± 5 ppm CO (whichever is greater)± 5% of reading or ± 2 ppm H2S (whichever is greater)± 5% of reading or ± 2 ppm H2S (whichever is greater)± 5% of reading or ± 2% LEL (whichever is greater)± 0.5% O2
Sampling MethodDiffusion sampling standard (hand aspirator or clip-on motorized pump optional)Diffusion sampling standard (hand aspirator or clip-on motorized pump optional)Diffusion sampling standard (hand aspirator or clip-on motorized pump optional)Diffusion sampling standard (hand aspirator or clip-on motorized pump optional)Diffusion sampling standard (hand aspirator or clip-on motorized pump optional)Diffusion sampling standard (hand aspirator or clip-on motorized pump optional)
DisplayDigital LCD displays with 7 segment plus 14 segment plus iconDigital LCD displays with 7 segment plus 14 segment plus iconDigital LCD displays with 7 segment plus 14 segment plus iconDigital LCD displays with 7 segment plus 14 segment plus iconDigital LCD displays with 7 segment plus 14 segment plus iconDigital LCD displays with 7 segment plus 14 segment plus icon
Preset Alarms (User Adjustable) Overscale alarm (Non-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 Over alarm: 2000.0 ppm1st 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 ppm1st 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 ppm1st 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 ppm1st alarm: 10% LEL 2nd alarm: 25% LEL 3rd alarm: 50% LEL Over alarm: 100% LELLow 1 alarm: 19.5% Low 2 alarm: 18.0% High alarm: 23.5% Over alarm: 40.0%
Types of AlarmsGas Alarm: 3 Increasing alarms, STEL, TWA, overscale alarm. O2 decreasing/increasing. Trouble alarm: Sensor disconnection, low battery, circuit error, calibration range errorGas Alarm: 3 Increasing alarms, STEL, TWA, overscale alarm. O2 decreasing/increasing. Trouble alarm: Sensor disconnection, low battery, circuit error, calibration range errorGas Alarm: 3 Increasing alarms, STEL, TWA, overscale alarm. O2 decreasing/increasing. Trouble alarm: Sensor disconnection, low battery, circuit error, calibration range errorGas Alarm: 3 Increasing alarms, STEL, TWA, overscale alarm. O2 decreasing/increasing. Trouble alarm: Sensor disconnection, low battery, circuit error, calibration range errorGas Alarm: 3 Increasing alarms, STEL, TWA, overscale alarm. O2 decreasing/increasing. Trouble alarm: Sensor disconnection, low battery, circuit error, calibration range errorGas Alarm: 3 Increasing alarms, STEL, TWA, overscale alarm. O2 decreasing/increasing. Trouble alarm: Sensor disconnection, low battery, circuit error, calibration range error
Display of AlarmGas Alarm: Flashing LEDs, continuous buzzer (100 db @ 30 cm), flashing gas value, vibration Trouble alarm: Flashing LEDs, intermittent buzzer (95 db @ 30 cm), display of error messageGas Alarm: Flashing LEDs, continuous buzzer (100 db @ 30 cm), flashing gas value, vibration Trouble alarm: Flashing LEDs, intermittent buzzer (95 db @ 30 cm), display of error messageGas Alarm: Flashing LEDs, continuous buzzer (100 db @ 30 cm), flashing gas value, vibration Trouble alarm: Flashing LEDs, intermittent buzzer (95 db @ 30 cm), display of error messageGas Alarm: Flashing LEDs, continuous buzzer (100 db @ 30 cm), flashing gas value, vibration Trouble alarm: Flashing LEDs, intermittent buzzer (95 db @ 30 cm), display of error messageGas Alarm: Flashing LEDs, continuous buzzer (100 db @ 30 cm), flashing gas value, vibration Trouble alarm: Flashing LEDs, intermittent buzzer (95 db @ 30 cm), display of error messageGas Alarm: Flashing LEDs, continuous buzzer (100 db @ 30 cm), flashing gas value, vibration Trouble alarm: Flashing LEDs, intermittent buzzer (95 db @ 30 cm), display of error message
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, 15 minutes)-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, 15 minutes)-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, 15 minutes)-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, 15 minutes)-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, 15 minutes)-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, 15 minutes)
Response TimeWithin 30 seconds (T90)Within 30 seconds (T90)Within 30 seconds (T90)Within 30 seconds (T90)Within 30 seconds (T90)Within 30 seconds (T90)
Power SourceLithium-ion battery, Approx. 25 hours after a 3 hour full chargeLithium-ion battery, Approx. 25 hours after a 3 hour full chargeLithium-ion battery, Approx. 25 hours after a 3 hour full chargeLithium-ion battery, Approx. 25 hours after a 3 hour full chargeLithium-ion battery, Approx. 25 hours after a 3 hour full chargeLithium-ion battery, Approx. 25 hours after a 3 hour full charge
ApprovalsATEX, CSA (Pending)ATEX, CSA (Pending)ATEX, CSA (Pending)ATEX, CSA (Pending)ATEX, CSA (Pending)ATEX, CSA (Pending)
Dimension & Weight2.2” W x 2.55” H x 1.02” D (Approx. 58 W x 65 H x 26 D mm), 3.52 ounces (approx. 100 g) without rubber booth 2.4” W x 2.63” H x 1.06” D (Approx. 61 W x 67 H x 27 D mm), 3.70 ounces (approx. 105 g) with rubber booth2.2” W x 2.55” H x 1.02” D (Approx. 58 W x 65 H x 26 D mm), 3.52 ounces (approx. 100 g) without rubber booth 2.4” W x 2.63” H x 1.06” D (Approx. 61 W x 67 H x 27 D mm), 3.70 ounces (approx. 105 g) with rubber booth2.2” W x 2.55” H x 1.02” D (Approx. 58 W x 65 H x 26 D mm), 3.52 ounces (approx. 100 g) without rubber booth 2.4” W x 2.63” H x 1.06” D (Approx. 61 W x 67 H x 27 D mm), 3.70 ounces (approx. 105 g) with rubber booth2.2” W x 2.55” H x 1.02” D (Approx. 58 W x 65 H x 26 D mm), 3.52 ounces (approx. 100 g) without rubber booth 2.4” W x 2.63” H x 1.06” D (Approx. 61 W x 67 H x 27 D mm), 3.70 ounces (approx. 105 g) with rubber booth2.2” W x 2.55” H x 1.02” D (Approx. 58 W x 65 H x 26 D mm), 3.52 ounces (approx. 100 g) without rubber booth 2.4” W x 2.63” H x 1.06” D (Approx. 61 W x 67 H x 27 D mm), 3.70 ounces (approx. 105 g) with rubber booth2.2” W x 2.55” H x 1.02” D (Approx. 58 W x 65 H x 26 D mm), 3.52 ounces (approx. 100 g) without rubber booth 2.4” W x 2.63” H x 1.06” D (Approx. 61 W x 67 H x 27 D mm), 3.70 ounces (approx. 105 g) with rubber booth
Case MaterialCase MaterialCase MaterialCase MaterialCase MaterialCase MaterialCase Material
ControlsTwo buttons: POWER / MODE, AIRTwo buttons: POWER / MODE, AIRTwo buttons: POWER / MODE, AIRTwo buttons: POWER / MODE, AIRTwo buttons: POWER / MODE, AIRTwo buttons: POWER / MODE, AIR
DataloggingLogs user ID, station ID, Calibration & Bump Test history, Alarm Events & Alarm Interval TrendsLogs user ID, station ID, Calibration & Bump Test history, Alarm Events & Alarm Interval TrendsLogs user ID, station ID, Calibration & Bump Test history, Alarm Events & Alarm Interval TrendsLogs user ID, station ID, Calibration & Bump Test history, Alarm Events & Alarm Interval TrendsLogs user ID, station ID, Calibration & Bump Test history, Alarm Events & Alarm Interval TrendsLogs user ID, station ID, Calibration & Bump Test history, Alarm Events & Alarm Interval Trends
Standard AccessoriesAlligator clip, protective rubber boot, charger, and calibration adapterAlligator clip, protective rubber boot, charger, and calibration adapterAlligator clip, protective rubber boot, charger, and calibration adapterAlligator clip, protective rubber boot, charger, and calibration adapterAlligator clip, protective rubber boot, charger, and calibration adapterAlligator clip, protective rubber boot, charger, and calibration adapter
Optional AccessoriesSDM-3R calibration station RP-3R Clip-on sampling pump with 4” rubber nipple, 10’ hose and probe (up to 40’ hose available) Padded carrying case for GX-3R and accessories USB to IrDA downloading cable for dataloggerSDM-3R calibration station RP-3R Clip-on sampling pump with 4” rubber nipple, 10’ hose and probe (up to 40’ hose available) Padded carrying case for GX-3R and accessories USB to IrDA downloading cable for dataloggerSDM-3R calibration station RP-3R Clip-on sampling pump with 4” rubber nipple, 10’ hose and probe (up to 40’ hose available) Padded carrying case for GX-3R and accessories USB to IrDA downloading cable for dataloggerSDM-3R calibration station RP-3R Clip-on sampling pump with 4” rubber nipple, 10’ hose and probe (up to 40’ hose available) Padded carrying case for GX-3R and accessories USB to IrDA downloading cable for dataloggerSDM-3R calibration station RP-3R Clip-on sampling pump with 4” rubber nipple, 10’ hose and probe (up to 40’ hose available) Padded carrying case for GX-3R and accessories USB to IrDA downloading cable for dataloggerSDM-3R calibration station RP-3R Clip-on sampling pump with 4” rubber nipple, 10’ hose and probe (up to 40’ hose available) Padded carrying case for GX-3R and accessories USB to IrDA downloading cable for dataloggerSDM-3R calibration station RP-3R Clip-on sampling pump with 4” rubber nipple, 10’ hose and probe (up to 40’ hose available) Padded carrying case for GX-3R and accessories USB to IrDA downloading cable for datalogger
WarrantyThree years material and workmanshipThree years material and workmanshipThree years material and workmanshipThree years material and workmanshipThree years material and workmanshipThree years material and workmanship
GX-3R Pro
Detectable Gases
GasMeasuring Range (Increments)Accuracy StatementPreset Alarms
Sensor Slot 1: Carbon Monoxide (CO) & Hydrogen sulfide (H2S) *Interchangeable
H2S/ CO 0 ~ 2000 ppm (1 ppm)± 5% of reading or ± 5 ppm COA1: 25 ppm│ A2: 50 ppm A3:1200 ppm│TWA: 25 ppm STEL: 200 ppm
Dual EC0 ~ 200.0 ppm (0.1 ppm)± 5% of reading or ± 2 ppm H2SA1: 5 ppm│ A2: 30 ppm A3: 100 ppm│TWA: 1.0 ppm STEL: 5.0 ppm
H2S Only EC0 ~ 200.0 ppm (0.1 ppm)± 5% of reading or ± 2 ppm H2SA1: 5 ppm│ A2: 30 ppm A3: 100 ppm│TWA: 1.0 ppm STEL: 5.0 ppm
CO (H2 Compensated) EC0 ~ 2,000 ppm± 5% of reading or ± 2 ppm COA1: 25 ppm│ A2: 50 ppm A3: 1200 ppm│TWA: 25 ppm STEL: 200 ppm
Sensor Slot 2: Combustibles (Methane as standard)
CH4/ HC Catalytic0 ~ 100 (1% LEL)± 5% of reading or ± 2 % LEL1st: 10% LEL │ 2nd: 25% LEL 3rd: 50% LEL │ Over:100% LEL
Sensor Slot 3: Oxygen (O2)
O2 EC0 ~ 40.0% Vol. (0.10%)± 0.5% O2Low 1: 19.5%│ Low 2: 18.0% High: 23.5%│ Over: 40.0%
Sensor Slot 4: Toxics & CO2 *Interchangeable
SO2 EC0 ~ 100.0 ppm (0.05 ppm)± 10% of reading or ± 5 % of full scaleA1: 2 ppm│ A2: 5 ppm A3: 100 ppm│ TWA: 0.25 ppm STEL: 0.25ppm
CO2 ppm / CO2%0 ~ 10.0% Vol. (0.01%)± 5% of reading or ± 2 ppmA1: 0.50% Vol.│ A2: 3.00% Vol. A3: 4.00% Vol.│ TWA: 0.50% Vol. STEL: 3.00% Vol.
IR 0 ~ 10,000 ppm (20 ppm)± 5% of reading or ± 2 ppmA1: 5,000 ppm│ A2: N/A TWA: N/A│STEL: N/A
Common Specifications
Sampling MethodDiffusion sampling standard (hand aspirator or clip-on motorized pump optional)
DisplayFull dot LCD with Autobacklight and Autorotation
Alarm TypesGas Alarm • 2 increasing alarms • STEL • TWA • Overscale alarm • O2 decreasing/ increasing Trouble Alarm • Sensor disconnection • Low battery • Circuit error • Calibration range error • Cal or bump due alarm • Man Down Alarm • Panic Alarm
Display of AlarmGas Alarm • Flashing LED's • Continuous buzzer (100 db @ 30cm) • Flashing gas value • Vibration Trouble Alarm • Flashing LED's • Intermittent buzzer (95 db @ 30cm) • Display of error message
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)
Response TimeWithin 30 seconds (T90)
Power SourceConfig- 4-gas + EC, 4-gas + IR / Li-ion- 25 hours, 16 hours / Alkaline- 16 hours, 7 hours
Dimension & Weight2.9” W x 2.6” H x 1.06” D (Approx. 73 W x 65 H x 26 D mm), 4.58oz (with rubber boot)
Case MaterialExplosion proof, dust and water resistant to IP-66/68 (2m,1h) approval. Drop height 23 ft
Bluetooth CommunicationBLE: with iOS and Android phone app: RK Link
DataloggingLogs user ID, station ID, Calibration & Bump Test history, Alarm Events & Alarm Trends
Standard AccessoriesAlligator clip, protective rubber boot, charger, calibration adapter
Optional Accessories• Padded carrying case • RP-3R Attachable sampling Pump with 4” rubber nipple, 10’ hose and probe (up to 40’ hose available) • USB to IrDA downloading cable for datalogger • SDM-3R calibration station • Hand aspirator
Safety Design / ApprovalsATEX, CSA (Pending)
WarrantyThree years material and workmanship including sensors

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