GasAlert Extreme Single Gas Detector from BW Honeywell


The BW Honeywell GasAlert Extreme willbe discontinued by October 18,2019.

The BW Honeywell GasAlert Extreme Single Gas Detector is a long term solution, designed with durability and comfort in mind. The GasAlert Extreme reliably monitors for any single gas hazard within its wide range of available toxic gas models. With easy on/off operation, this single gas detector offers extended longevity with a field replaceable battery and sensor. Calibration is a simple automatic procedure and is compatible with BW’s MicroDock II automatic test and calibration system. A wide range of user options, multi language display and datalogging functionality make the GasAlert Extreme an ideal solution for many applications.


  • Direct, real time readings on a large LCD
  • Operates through consecutive shifts
  • Secure and accurate history with datalogging
  • Continuous LCD shows real time concentrations
  • Compact and lightweight design makes it comfortable to wear
  • Water resistant
  • Simple automatic calibration procedure; compatible with BW MicroDock II automatic test and calibration station
  • Full function self test of sensor, battery status, circuit integrity and audible/visual alarms on start up
  • Bright wide angled visual alarm bars
  • Built in concussion-proof boot
  • Equipped with internal vibrating alarm for high noise areas
  • Secure and accurate history with datalogging
  • Multi language support in English, French, German, Spanish and Portuguese
  • Tamper proof settings with passcode protection
  • Alarm setpoints for all sensors are user adjustable. Setpoints are automatically displayed during instrument start up


  • Agriculture
  • Chemical
  • Fire service/HazMat
  • Food and beverage
  • Oil and gas
  • Pharmaceutical
  • Pulp and Paper
  • Steel Manufacturing
  • Water and wastewater industries


Sensors Electrochemical sensors
Battery 3V Battery
Battery Life 1.5 years, typical
Alarms Visual, vibrating, audible (95dB)
Low, High, STEL, TWA
Tests Sensor integrity, circuitry, battery and audible/visual alarms on activation, battery (continuous)
Pump Compatible with the Sampler motorized pump
User Options Confidence beep, latching alarms, stealth mode, passcode protection, automatic O2 calibration, automatic backlight, user settable calibration gas level, calibration pas due lockout, language choices
Ratings EMI/RFI: Complies EMC Directive 89/336/EEC
IP 66/67
Intrinsic Ratings UL: Class I, Division 1, Groups A, B, C, D, Class II, Division 1, Groups E, F, G
ATEX: CD Ex II 1 G T4, Ex ia IIC T4
CE: European Conformity
Warranty Two year warranty including sensors, One year for Ammonia, Chlorine, Ozone, Ethylene Oxide and Chlorine Dioxide sensors
Size 1.1″ x 2.0″ x 3.75″
Weight 2.9 ounces

Sensor Specifications

Hydrogen Sulfide (H2S)
0 – 100 ppm
Hydrogen Sulfide, High Range  0 – 500 ppm
Sulfur Dioxide (SO2) 0-100.0 ppm
Hydrogen Cyanide (HCN) 0-30.0 ppm
Carbon Monoxide (CO) 0-1,000 ppm
Carbon Monoxide, Low Hydrogen 0-1,000 ppm
Ammonia (NH3)  0 – 100 ppm
Ammonia, High Range (NH3) 0-400 ppm
Chlorine (Cl2) 0-50.0
Nitric Oxide (NO) 0-250 ppm
Nitrogen Dioxide (NO2) 0-100 ppm
Phosphine (PH3) 0-5.0 ppm
Ethylene Oxide (ETO) 0-100.0 ppm
Chlorine Dioxide (ClO2) 0-1.0 ppm
Ozone (O3) 0-1.0 ppm
Oxygen (O2), % Vol 0-30%

Ordering Information

The GasAlert Extreme gas detectors includes sensor as specified, alligator clip, concussion proof boot, calibration adapter, and instructions. For pricing, please call AFC International at 1-800-952-3293, 219-987-6825 or fax 219-987-6826 or email

Catalog No.
GasAlert Extreme for Hydrogen Sulfide, Yellow GAXT-H-DL
GasAlert Extreme for Hydrogen Sulfide, Extended Range, Yellow GAXT-H-2-DL
GasAlert Extreme for Carbon Monoxide, Yellow GAXT-M-DL
GasAlert Extreme for Carbon Monoxide, Hydrogen Resistant, Yellow GAXT-M2-DL
GasAlert Extreme for Oxygen, Yellow GAXT-X-DL-2
GasAlert Extreme for Sulfur Dioxide, Yellow GAXT-S-DL
GasAlert Extreme for Chlorine, Yellow GAXT-C-DL
GasAlert Extreme for Hydrogen Cyanide, Yellow GAXT-Z-DL
GasAlert Extreme for Nitrogen Dioxide, Yellow GAXT-D-DL
GasAlert Extreme for Ammonia, Yellow GAXT-A-DL
GasAlert Extreme for Ammonia, Extended Range, Yellow GAXT-A2-DL
GasAlert Extreme for Phosphine, Yellow GAXT-P-DL
GasAlert Extreme for Ozone, Yellow GAXT-G-DL
GasAlert Extreme for Ethylene Oxide, Yellow GAXT-E-DL
GasAlert Extreme for Nitric Oxide, Yellow GAXT-N-DL
GasAlert Extreme for Chlorine Dioxide, Yellow GAXT-V-DL


GasAlert Extreme Gas Detector Literature

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