About Product


The GasAlert Extreme is a compact and durable gas detector with advanced RFI protection. It has a high waterproof rating (IP66/67) and can be fully submerged up to 3ft. The detector also has a shock-resistant boot for added durability. It is delivered ready for use and can be easily clipped to a pocket, belt, or hard hat for optimal protection.

The GasAlert Extreme features a bright LCD screen that shows real-time gas concentrations and the device’s status. It performs a full function self-test upon startup to ensure the integrity of the sensor, circuitry, and battery. The detector clearly indicates the type of gas hazard present, including low, high, TWA, and STEL gas alarms. It can also display recorded TWA, STEL, and Peak exposures when needed.

One of the advantages of the GasAlert Extreme is its low cost of ownership. It offers automated calibration, a 3-year lithium battery (available in local stores), and simple one-button control, reducing training and maintenance expenses. The detector is operated by an advanced microcontroller and an electrochemical sensor and is equipped with high-output audible and visual alarms.

Hydrogen sulfide (H2S) with yellow housing

  • Integral concussion-proof boot
  • Continuous LCD shows real-time gas concentration with backlight in low light (auto); in alarm (auto) and on demand
  • Waterproof IP 66/67 rating up to 3 ft fully submerged
  • Provides 85 dB tone and bright LED indication on alarm (typical)
  • 3-year battery life (9,000 hours)
  • Available with internal vibrating alarm
  • Equipped with plug-in, replaceable sensor
  • Simple auto-zero and calibration procedure
  • Peak value displayed on command (in ppm or %)
  • TWA (time weighted average) values are recorded and displayed to evaluate the cumulative exposure danger and to aid regulatory compliance
  • Classified intrinsically safe by UL to U.S. and Canadian standards; Cenelec certified; certified in Australia
  • Full function self-test of: sensor, battery, circuitry integrity and audible/visual alarms
  • Small size (1.1 x 2.0 x 3.75 in. / 28 x 50 x 95 mm) and lightweight (2.9 oz. / 83 g)
  • LOW, HIGH, TWA and STEL alarms with adjustable setpoints
  • Pocket/belt clip, test cap and hose, battery, and instructions in local languages included

Supported Gases:

  • H2S – hydrogen sulfide
  • NO – nitric oxide
  • CO – carbon monoxide
  • HCN – hydrogen cyanide
  • O2 – oxygen
  • Cl2 – chlorine
  • SO2 – sulfur dioxide>
  • ClO2 – chlorine dioxide
  • PH3 – phosphine
  • O3 – ozone
  • NH3 – ammonia
  • ETO – ethylene oxide
  • NO2 – nitrogen dioxide

Manufacturer Specs

Auto zero – Yes
Calibration – Automatic
Backlight – Low light (auto); alarm condition (auto); on demand
Full function self-test – Verifies integrity of sensor, circuitry and battery; audible/visual alarms
Sensor –  Plug-in, electrochemical cell (temperature compensated)
Indicators And Alarms – Clearly advises alarm levels both visually and audibly
Visual alarm – Flashing, wide-angled alarm lens with dual red LEDs, plus alarm LCD readout
Audible alarm – High-output, pulsing 85 dB at 1 ft. / 0.3 m (typical)
Confidence beep – Every 5 seconds (field-selectable)
Other – Low battery; off warning; sensor fail
Optional internal – vibrator Vibrates in sync with audible and visual alarms
Continuous LCD Display – Alphanumeric gas readout and status display advises:
Gas ppm or % – Continuously displays gas concentration present
TWA and STEL ppm or % – Records and displays on demand
Peak ppm or % – Records and displays peak (maximum) exposure to gas on demand
Setpoints – Displayed on activation (auto) and on demand in ppm or %


Full function self-test – Full function self-test on activation (auto)
General Specifications – Impact-resistant ABS enclosure
Humidity – 5% to 95% RH (non-condensing) (15% to 90% non-condensing for PH3 and NH3)
EMI/RFI – Complies with EMC Directive 89/336/EEC
Battery type – 3-volt lithium (camera battery available locally)
Battery life – 3 years (9,000 hours)
Size – 1.1 x 2.0 x 3.75 inches / 28 x 50 x 95 mm
Weight – 2.9 oz. / 83 g
Warranty – 2 years including sensor, except NH3 (one year)

Tech Specs

Gas Detection/Personal Gas Detection Template

Number of Gases – Single
Gas Types – H2S
Alarm (Personal Gas Detector) – Audible, Audible-Visible-Vibrating, Vibrating, Visual
Type (Gas Detection) – Portable
H2S – Yes
Min Measurement Range H2S – 0 PPM
Max Measurement Range H2S – 100 PPM

Test Equipment General Attributes

Unique Features – 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
Warranty – 2 YEARS
Warranty Details – Full 2-year warranty including sensors(1-year NH3 sensor)
IP Rating – IP66, IP67
Product Height – 2.25 IN
Product Length – 4.50 IN
Product Width – 4.25 IN
Calibration Included – Factory Calibration
Country of Origin – Mexico
Shipping Height – 2.25 IN
Shipping Length – 4.50 IN
Shipping Width – 4.25 IN

The BW GasAlert Extreme H2S gas detector is a portable device specifically designed to detect the presence of hydrogen sulfide (H2S) gas in the air. With its distinctive yellow housing, it is easy to locate in hazardous environments, offering added safety and visibility.

Featuring a compact and durable design, the GasAlert Extreme H2S utilizes a low-power microcontroller to provide continuous monitoring of H2S gas levels. It is equipped with audible, visual, and vibrating alarms that promptly alert the user when the gas concentration exceeds the predetermined thresholds.

Operating the GasAlert Extreme H2S is simple, thanks to its one-button operation and large LCD display, which clearly shows gas concentration levels in parts per million (ppm). The device is also water-resistant and capable of withstanding challenging environmental conditions.

Compliant with internationally recognized safety standards such as UL, ATEX, and CE, the GasAlert Extreme H2S ensures reliable protection and meets the highest safety requirements.

Overall, the GasAlert Extreme H2S gas detector is a reliable and effective tool for detecting H2S gas in various work environments. Proper training and maintenance are essential to ensure its continued effectiveness and reliability. It should always be used in conjunction with other personal protective equipment to ensure maximum safety.


Other Products

Brand we worked with

Contact Us