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GX-3R Pro Multi Gas Detector with Bluetooth

The GX-3R Pro is the world’s smallest 5-gas monitor weighing only 4.58 ounces and fits in the palm of your hand.



The GX-3R Pro Multi Gas Detector is the world’s smallest 5-gas monitor weighing only 4.58 ounces and fits in the palm of your hand. It 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 gas sensors (Hydrogen Cyanide (HCN) and Nitrogen Dioxide (NO2) sensors are currently available for the GX-3R Pro). Two of the four sensor slots have interchangeable sensors providing flexible configurations, which can easily be changed in the field.

The GX-3R Pro Multi Gas Detector comes equipped with Bluetooth wireless communication, man-down alarm, the choice of alkaline or rechargeable power supply, and a 3 year warranty. The Lithium-ion battery pack will operate for 25 hours and will fully charge in 3 hours. 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. 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.

Please note: many other configuration are available, please contact AFC for more details.

Tags: CO Carbon Monoxide Gas Detector, H2S Hydrogen Sulfide Gas Detector, O2 Oxygen Gas Detector


  • Smallest & lightest detector
  • Detect up to 5 gases simultaneously
    Confined Space: LEL, O2, H2S, CO
    – Toxics/IR Sensors: HCN, NH3, NO2, PH3, SO2, and CO2
    – H2 Compensated CO sensor available
  • Simple 2-button operation
  • Bluetooth communication with iOS & Android App
  • 3 user adjustable alarm levels
  • Panic Alarm & Man Down Alarm
  • Large full dot, auto-backlit display with auto-rotation
  • Field replaceable sensors & filters
  • Water and dust resistant design, IP66/68
  • 3 Year Warranty*


Sample Method Diffusion or clip-on motorized pump, optional
Response Time T90 in 30 seconds
Alarm Gas Alarm: 1st, 2nd, 3rd (user adjustable), OVER alarm, STEL and TWA
Trouble Alarm: Sensor connection, low battery, circuit failure and calibration rang error
Battery Lithium-Ion Battery, 15-25 hours
Display Digital LCD, gas name & concentration, auto backlighting during alarm, operation icon, battery icon
Alarm Flashing LEDs
Audible: 100 dB @ 30cm
Datalogging Logs user ID, station ID, calibration & bump history, alarm events, alarm interval trends
Enclosure Dust and water resistant with IP-66/68 rating
Temperature -4 to 122°F
Humidity 10% to 90% relative humidity (non-condensing)
Intrinsic Safety ATEX and CSA
Size 2.9″ x 2.6″ x 1.06″
Weight 4.58 ounces
Warranty 3 Year warranty, 1 year for ammonia sensor

Sensor Specifications

0 – 100% LEL
10% /25 %
Carbon Monoxide (CO)  0 – 2,000 ppm 25 ppm/50 ppm
Hydrogen Sulfide (H2S)  0 – 200.0 ppm  5 ppm/30.0 ppm
Oxygen (O2)  0 – 40% Vol  19.5 % Vol/18.0% Vol
Hydrogen Cyanide (HCN)  0 – 30.0 ppm  5.0 ppm/10.0 ppm
Ammonia (NH3)  0 – 400 ppm  25.0 ppm/35.0 ppm
Nitrogen Dioxide (N2O)  0 – 20.0 ppm  2.0 ppm/4.0 ppm
Phosphine (PH3)  0 – 20.00 ppm  0.30 ppm/0.60 ppm
Sulfur Dioxide (SO2)  0 – 100.0 ppm  2.00 ppm/5.00 ppm
Carbon Dioxide (CO2)  0 – 10.0% Vol
0 – 10,000 ppm
 0.50% Vol/3.00% Vol
5,000 ppm/N/A

* 3 year warranty on material and workmanship including sensors (1 year for Ammonia sensor)


GX-3R Pro Multi Gas Detector datasheet

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