Now Selling Draeger Gas Detection & Respiratory Products
Now Selling Draeger Gas Detection & Respiratory Products
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RKI GX-3R 4-Gas Meter w/ Pump Rental
RKI GX-3R 4-Gas Meter w/ Pump Rental
RKI GX-3R 4-Gas Meter w/ Pump Rental
RKI Instruments

RKI GX-3R 4-Gas Meter w/ Pump Rental

Regular price $65.00 Unit price per
Shipping calculated at checkout.

RKI GX-3R 4-Gas Monitor - World's Smallest 4-Gas Monitor

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. 

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.


• Smallest & lightest 4 gas monitor — 2.2" W x 2.55" H x 1.02" D, 3.52 ounces

• Simultaneous detection of 4 gases — LEL, O2, H2S & CO — H2 Compensated CO sensor available

• Simple 2-button operation

• Non-Compliance Indicator

 Alarms: audible, visual, & vibration

• 3 user adjustable alarm levels

• Impact resistant body with removable rubber boot

• Large LCD Auto-backlit display

 25 hours of operation (Lithium-ion battery)

• Field replaceable sensors & filters

• Water and dust resistant design, IP66/68

• Stealth mode for law enforcement

• 3 Year warranty


• Personal monitoring • Confined spaces • Refineries/petrochemical • Utilities

• Oil and Gas • Water/wastewater • Fire services • Construction

Sensor Ranges

O2           0-40% Vol (0.1% Increments)

LEL          0-100% LEL (1% LEL Increments)

CO/H2S   CO 0-2000 PPM (1 PPM Increments), H2S 0-200 PPM (0.1 PPM Increments)

H2S        0-200 PPM (0.1 PPM Increments)

CO - Hydrogen Compensated   0-2000 PPM (1 PPM Increments) 

Gas Alarm:  3 Increasing alarms, STEL, TWA, overscale alarm. O2 decreasing/increasing.

Trouble alarm:  Sensor disconnection, low battery, circuit error, calibration range error

Display of Alarm

Gas 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)

Response Time Within 30 seconds (T90)

Power Source Lithium-ion battery, Approx. 25 hours after a 3 hour full charge

Approvals ATEX, CSA (Pending)

Dimension  & Weight 2.2” 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 Material Explosion proof, dust and water resistant to IP-66/68 (2m,1h) approval. Drop height 23 ft

Controls Two buttons: POWER / MODE, AIR

Datalogging Logs user ID, station ID, Calibration & Bump Test history, Alarm Events & Alarm Interval Trends

Rental unit includes - RKI GX-3R 4-Gas meter, RKI RP-3R sampling pump, 10' sampling line, 1' probe, AC & DC chargers, spare filters, calibration cap, manuals and case.