GasAlertMicro 5 Series combustible gas detector

Simultaneously monitor and display up to five atmospheric hazards with the BW Technologies GasAlertMicro 5 series combustible gas detector. Adaptable to a variety of applications, the GasAlertMicro 5 Series has an extensive selection of user settable field options and is available as either a standard toxic gas model, a PID model for the detection of VOCs or an IR model for carbon dioxide detection.

Use the passcode function to prevent unauthorized modifications of the instrument’s settings. The GasAlertMicro 5 combustible gas detector is fully compatible with BW’s MicroDock II automatic test and calibration system and Fleet Manager 2 desktop software. Please note: due to board and sensor configuration the GasAlertMicro 5 models are not interchangeable (ie, a PID sensor cannot be used in a IR configured unit).


  • Measure up to five atmospheric hazards concurrently, sensors available include: H2S, CO, O2, SO2, Cl2, ClO2, NH3, PH3, HCN, NO2, O3, LEL, VOCs (volatile organic compounds) and CO2
  • Fully customizable to suit any application
  • Rapidly switch from diffusion mode to the optional integrated pump in the field
  • Continuous LCD shows real time gas concentrations
  • Water resistant
  • Full function self test of sensor, battery status, circuit integrity and audible/visual alarms on start up
  • Simple automatic calibration procedure: compatible with BW MicroDock II automatic test and calibration station
  • Bright wide angled visual alarm bars
  • Built in concussion proof boot
  • Integral motorized pump option for remote sampling
  • Equipped with internal vibrating alarm for high noise areas
  • Two power options: AA alkaline or rechargeable hot swappable battery packs
  • Multi language support in English, French, German, Spanish and Portuguese


SensorsElectrochemical sensors, catalytic bead, PID, Infrared
AlarmsVisual, vibrating, audible (95dB)
Low, High, STEL, TWA, OL (over limit)
TestsSensor integrity, circuitry, battery and audible/visual alarms on activation, battery (continuous), sensor (continuous)
PumpOptional: Sample from up to 66 feet
User OptionsConfidence beep, set STEL interval, set TWA method, sensor on/off, latching alarms, safe display mode, stealth mode, adjust clock, set datalogger rate, passcode protection, correction factor library (LEL, & PID), fast pump, combustible gas measurement (%LEL or % by volume methane), Oxygen auto calibration on start up, automatic backlight, sleep mode, user settable calibration gas level, calibration due lockout, daily bump test, high resolution
Humidity10-100% rH, non-condensing
Operating Temperature-4 – 122ºF
PID: 14 to 104ºF
RatingsEMI/RFI: Complies EMC Directive 89/336/EEC
IP 65/66
Intrinsic RatingsUL: Class I, Division 1, Groups A, B, C, D
ATEX: CE Ex II 1, Ga Ex ia IIC T4, CE ex II 2 G (IR model only), Ex d ia IIC T4
IECEX: Ga Ex ia IIC T4, Ex d ia IIC T4 (IR model only)
WarrantyFull two year warranty, 1 year on ammonia, chlorine, ozone, chlorine dioxide and PID sensors
Size5.7″ x 2.9″ x 1.5″
Weight13 ounces

Sensor Specifications

Resolution (Default)High Resolution
Hydrogen Sulfide (H2S)
0 – 500 ppm
1.0 ppm0.1 ppm
Carbon Monoxide0 – 999 ppm1 ppmn/a
TwinTox (H2S)0-500 ppm1.0 ppm0.1 ppm
TwinTox (CO)0-500 ppm1.0 ppmn/a
Oxygen (O2)0-30%0.1%n/a
Sulfur Dioxide (SO2)0-150 ppm1.0 ppm0.1 ppm
Phosphine (PH3)0-5.0 ppm1.0 ppm0.1 ppm
Ammonia (NH3)0-100 ppm1.0 ppm0.1 ppm
Nitrogen Dioxide (NO2)0-99.9 ppm1.0 ppm0.1 ppm
Hydrogen Cyanide (HCN)0-30.0 ppm1.0 ppm0.1 ppm
Chlorine (Cl2)0-50.0 ppm1.0 ppm0.1 ppm
Chlorine Dioxide (ClO2)0-1.0 ppm0.1 ppm0.01 ppm
Ozone (O3)0-1.0 ppm0.1 ppm0.01 ppm
PID (VOCs)0-1,000 ppm1n/a
IR Carbon Dioxide (CO2)0-50,000ppm
0-5.0% v/v
Combustible Gases0-100% LEL
0.5.0% v/v


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GasAlertMicro 5 frame
 GasAlertMicro 5 frame