BW Gas Alert Micro 5 Series Multi-Gas Detectors

Model: M5

GasAlertMicro5 offers maximum versatility in a portable multi-gas detector that can be used almost anywhere. Allows a fifth toxic sensor to be added to the standard four gases or create non-standard combinations. Add the attachable/removable sampling pump for remote sampling and confined space entry

Help with Ordering

Select a Model


BW M5-XWAY-R-P-D-Y-N-00 GasAlertMicro 5 %LEL, O2, H2S, CO, NH3 - lithium polymer battery and pump - yellow housing.

$1,474.00 USD

was $1,675.00

1 in Stock


BW M5-XWCY-R-P-D-Y-N-00 GasAlertMicro 5 %LEL, O2, H2S, CO, Cl2 - lithium polymer battery and pump - yellow housing.

$1,386.00 USD

was $1,575.00

1 Week


BW M5-XWSY-R-P-D-Y-N-00 GasAlertMicro 5 %LEL, O2, H2S, CO, SO2 - lithium polymer and pump - yellow housing.

$1,386.00 USD

was $1,575.00

2 to 3 weeks


BW M5-XW0Y-R-D-D-Y-N-00 GasAlertMicro 5 %LEL, O2, H2S, CO - lithium polymer battery - yellow housing.

$1,016.40 USD

was $1,155.00

2 to 3 weeks


BW M5-XW0Y-R-P-D-Y-N-00 GasAlertMicro 5 %LEL, O2, H2S, CO - lithium polymer battery and pump - yellow housing.

$1,126.40 USD

was $1,280.00

2 to 3 weeks


BW M5-XWAY-R-D-D-Y-N-00 GasAlertMicro 5 %LEL, O2, H2S, CO, NH3 - lithium polymer battery - yellow housing.

$1,364.00 USD

was $1,550.00

2 to 3 weeks


BW M5-XW0Y-A-P-D-Y-N-00 GasAlertMicro 5 %LEL, O2, H2S, CO - alkaline batteries and pump - yellow housing.

$994.40 USD

was $1,130.00

2 to 3 weeks


BW M5-XWCY-R-D-D-Y-N-00 GasAlertMicro 5 %LEL, O2, H2S, CO, Cl2 - lithium polymer battery - yellow housing.

$1,276.00 USD

was $1,450.00

2 to 3 weeks

Key Features:

  • Compact (5.7 x 2.9 x 1.5 in. / 14.5 x 7.4 x 3.8 cm) and lightweight (13.1 oz. / 370 g)
  • Rugged, highly water-resistant design.. Continuous LCD shows simultaneous gas concentrations for 5 gases
  • Integral concussion-proof enclosure for the most rugged environments
  • Integral motorized pump option for remote sampling (optional)
  • Two power options: three AA alkaline batteries or a rechargeable battery pack
  • Provides 95 dB alarm tone and two bright wide-angled alarm bars
  • Equipped with internal vibrating alarm for high noise areas
  • Multi-language support in English, French, German, Spanish and Portuguese
  • Three backlight options: standard-activates in low light (auto), in alarm (auto) and reactivates on- demand; alarm only-activates in alarm conditions and reactivates on-demand; stealth mode
  • Four alarm levels: instantaneous Low and High Alarm for all gases; TWA (time weighted average) and STEL (short term exposure limit) for toxic gases
  • Simple automatic calibration procedure; compatible with BW MicroDock II system
  • Records TWA, STEL and maximum exposures to gas and displays readings on command
  • User selectable field options include: confidence beep, pass code protection, latching alarm, calibration due date and "SAFE" display function, stealth mode, selectable ppm resolution for some gases (e.g. SO2 0.1 ppm)
  • Full function self-test of: sensor, battery and circuit integrity; and audible/visual alarms


Gas Measuring range Resolution TWA STEL LOW HIGH
O2 0-30.0% 0.1 N/A N/A 19.5 22.5
CO 0-999 ppm 1 35 200 35 200
H2S 0-100 ppm 1 10 15 10 15
PH3 0-5.0 ppm 0.1 0.3 1.0 0.3 1.0
SO2 0-100 ppm 0.1 2 5 2 5
NO2 0-99.9 ppm 0.1 2.0 5.0 2.0 5.0
HCN 0-30.0 ppm 0.1 4.7 10.0 4.7 10.0
Cl2 0-50.0 ppm 0.1 0.5 1.0 0.5 1.0
NH3 0-100 ppm 1 25 35 25 50
ClO2 0-1 ppm 0.1 0.1 0.3 0.1 0.3
O3 0-1 ppm 0.1 0.1 0.1 0.1 0.1
PID 0-999 ppm 5.0 50 100 50 100
LEL 0-100% LEL
0-5% v/v
1% N/A N/A 10% 20%
Auto zero Yes
Calibration Automatic
Backlight Standard Mode: low light (auto); alarm condition (auto); reactivation on demand
Alarm Only Mode:
alarm condition (auto); reactivation on demand
Stealth Mode: backlight inactive; audible and visual alarms silenced
Full function self-test Sensor integrity, circuitry and battery; audible/visual alarms
Sensor Plug-in, electrochemical cell (toxic and oxygen); catalytic (LEL)
User field options Confidence beep, pass code protection, latching alarms, passed calibration user- lockout option, "SAFE" display function, stealth mode, oxygen auto-cal on start-up, alarm only backlight mode, combustible gas measurement (%LEL or % by volume methane), LCD language option, STEL calculation choice, TWA calculation choice
ALARM INDICATORS combustible correction factor options, user-settable calibration gas levelClearly advises alarm conditions with audible, visual and vibrator alarms
Visual alarms Two flashing alarm bars visible from all angles
LCD indicates gas present and alarm levels encountered
Audible alarm Typically 95 dB at 1 ft./ 30 cm variable pulsed audible alarm
Vibrator alarm Pulses warning in gas alarm conditions, or for any status alarms
Other ALARMLEVELS: Low battery, over range, multiple gas / pump and failed or missing sensor Instantaneous Low Alarm for all gases; Instantaneous High Alarm for all gases;
LCD TWA (time weighted average) and STEL (short term exposure limit) for toxics Continuous, alphanumeric gas readout and status display advises
Gases monitored H2S, CO, O2, SO2, PH3, NO2, NH3, HCN, Cl2, ClO2, O3, PID and/or combustibles (0-100% LEL or 0-5.0% methane)
Gas concentration Simultaneously and continuously displays gas concentration(s) for all sensors (in ppm, %LEL, or % v/v)
STEL/TWA ppm or % Records STEL and TWA exposures and displays on demand
Peak ppm or % Records and displays peak exposure to gas and displays on demand
Alarm setpoints Displayed on activation
Calibration due date In days remaining
Clock: Real-time clock setting displayed on start-up (datalogger models only)
TESTS Full function self-test: Full function self-test on activation
Battery Continuous
GENERAL SPECIFICATIONS Rugged, composite material; two-shot molded polymer case with integral anti-shock boot
Operating temperature -4 to 122 oF / -20 to 50 oC
Humidity 0 - 95% RH (non-condensing)
EMI/RFI Complies with EMC Directive 89/336/EEC
Protection Highly water resistant and dust proof housing
Battery Options 14 hrs on three AA alkaline cells (10 hours with optional motorized pump*)
14 hrs on three AA alkaline cells (10 hours with optional motorized pump*)
18 hrs on rechargeable "hot-swappable" battery pack (13 hrs with optional motorized pump*)
*when equipped with oxygen, combustible, TwinTox and one additional toxic sensor
3 hours charge time.
Size 5.7 x 2.9 x 1.5 in. / 14.5 x 7.4 x 3.8 cm
Weight 13.1 oz. / 370 g
WARRANTY Full 2-year warranty including all sensors
DATALOGGER OPTIONS User-downloadable datalogger
Data recorder ll events and occurrences (calibration zero adjustment, calibration span adjustment, gas readings, TWA, STEL, alarm condition, failures detected by the microprocessor)
Sampling rate Factory set at 5-second intervals and user-settable from 1 to 127-second intervals
Storage 2 months of continuous data via 32 MB Flash MMC card (64 MB and 128 MB cards also available); when full, the wrap-around feature replaces oldest data with most recent data


Fleet Manager II allows you to conveniently manage your gas detectors. Data storage and analysis has never been so simple. With the same look and feel as Fleet Manager, Fleet Manager II allows users to download information directly from BW Technologies or the MicroDock II.
With improved functionality, users can:
  • Automatically create accurate and user-friendly reports
  • Easily sort, format and graph data as well as view history
  • Archive and share data easily, including databases
  • Download and manage calibration and bump check records as well as datalogged information onto any PC
Fleet Manager is compatible with
  • GasAlert Quattro
  • Gasalert Max XT
  • GasAlert Clip Extreme 24 Month
  • GasAlert Clip Extreme 36 Month
  • GasAlert Extreme
  • GasAlertMicro
  • GasAlertMicro 5 Series (Micro 5 IR, Micro 5 PID)
  • GasAlertMicroClip
  • MicroDock II

This gas detector unit has the following replacement sensors available, depending upon individual configuration:

SR-X10-C1 Replacement oxygen (O2) sensor
PS-RH04S Replacement hydrogen sulfide (H2S) sensor
PS-RM04 Replacement carbon monoxide (CO) sensor
PS-RM04H Replacement carbon monoxide (CO) sensor, H2 resistant
PS-RS04 Replacement sulfur dioxide (SO2) sensor
PS-RC10 Replacement chlorine (Cl2) sensor
PS-RZ10 Replacement hydrogen cyanide (HCN) sensor
PS-RD04 Replacement nitrogen dioxide (NO2) sensor
SR-A04 Replacement ammonia (NH3) sensor
SR-V04 Replacement chlorine dioxide (ClO2) sensor
SR-B04 Replacement carbon dioxide (CO2) IR sensor
SR-Q07 Replacement volatile organic compounds (VOC) PID sensor, 10.6 eV
D4-RHM04 Replacement TwinTox sensor
SR-W04-UF Replacement combustible (LEL) sensor
SR-W04 Replacement combustible (LEL) sensor with heavy duty silicone filter

GasAlert Micro5 series (M5) Expert Product Review:

The Good:

Provides protection from 1-5 different kinds of atmospheric hazards, making it useful in a wide array of applications. It is available either as a standard toxic gas unit, a PID model for detection of VOCs or as an IR model for CO2 detection. It has both alkaline and rechargeable battery pack options, which are field-changeable, providing ease of use. You can also switch from diffusion mode to the optional built-in pump right in the field.

The Bad:

It is pricey, and the huge variety of sensor options, pump and battery options make choosing the right unit configuration a bit confusing for those not familiar with them. I recommend calling us at our toll free number (1.877.766.5412) for assistance in getting the right one.

The Bottom Line:

The GasAlertMicro 5 is highly configurable, which makes it suitable for the widest range of industries and applications. An example of some applications are Wastewater Plants, Pulp and Paper, Airlines, Landfills, Oil and Gas, Food and Beverage, Chemical Plants, Hazmat/Homeland Security and many more! It has many of the same user friendly features as the other units in the BW product line, so it is simple and easy to operate in the field and is a decently small size for its capabilities.

Full Review:

The extensive selection of sensors and user-settable field options in the GasAlertMicro 5 make it one of the most versatile units out there. The new pump design has a visible integrated filter window that allows the user to easily inspect the filter for dirt and debris. This also makes changing the pump filters quick and easy and still provides superior water resistance. AA alkaline batteries or the hot-swappable rechargeable battery pack options allow for fast, safe, and easy battery installation right in the field.

Regular maintenance is required on this model in the form of frequent Calibrations and battery replacement or charging. Bump Tests can also be performed on the unit depending on personal preference or when site safety regulations require it.

Built for rugged environments, the built-in concussion proof boot provides excellent protection against accidental bumps, scratches and damage; and it is water-proof, with an IP rating of 67 it can be submerged in water up to 1 m deep for 30 minutes. The real-time gas concentration is displayed continuously on the LCD so you will always know the current levels, even when the unit is not in alarm. The unit has a built in Datalogging feature, enabling you to retrieve a detailed and accurate history of conditions and unit maintenance if needed.

Calibrating the unit is required every 180 days by factory default but is quick and easy to perform; the procedure can be done in the field and only takes about 2 minutes to perform, and all you will require is a cylinder of calibration gas and a regulator. It is also compatible with the BW MicroDock II calibration and bump test station for those who wish to use a more hands-free, automated, calibration and bump test procedure.

Monitor 5 gases simultaneously. Waterproof to 3 ft and has a concussion proof boot with an optional attachable/removable pump.

GasAlertMicro5 portable gas detector simultaneously monitors and displays up to 5 potential atmospheric hazards including oxygen, combustible gases and a range of toxic gases. Compact and lightweight, GasAlertMicro5 adds multi-gas detection to BW Technologies water-resistant line of detectors. Audible, visual and vibrator alarms activate in the event of a low, high, TWA or STEL alarm condition. An optional motorized pump is available.

Beyond features that come standard with BW portable instruments such as confidence beep, full function self test, simple automatic calibration procedure and passcode protection, GasAlertMicro5 includes an extended selection of user-settable field options now including: stealth mode, backlight options, selectable ppm resolution, STEL / TWA measurement choice, combustible/PID correction factor options, user-settable calibration gas concentrations and multi-language support.

Supported Gases:

  • H2S - hydrogen sulfide
  • HCN - hydrogen cyanide
  • CO - carbon monoxide
  • Cl2 - chlorine
  • O2 - oxygen
  • ClO2 - chlorine dioxide
  • SO2 - sulfur dioxide
  • O3 - ozone
  • PH3 - phosphine
  • LEL combustibles
  • NH3 - ammonia
  • NO2 - nitrogen dioxide

What's Included:

  • Batteries: three replaceable alkaline cells or one rechargeable battery pack with the GasAlertMicro 5 Battery Charger (also provided with the GasAlertMicro 5 PID and the GasAlertMicro 5 IR).
  • Sensors: O2, combustible (LEL), toxic, H2S/CO (TwinTox sensor), PID, or CO2
  • Calibration cap and hose
  • Single gas calibration cap
  • Screwdriver
  • Quick reference guide
  • Fleet Manager CD (if applicable)
  • Manual and training CD-ROM

Ask a Question about the M5

comments powered by Disqus

Current Promos

Get Free Shipping on any purchase over $299
Find the right sensor with our sensor selection tool