The Gasman is a rugged, compact single gas detector, designed for use in the toughest environments. Its compact and lightweight design makes it the ideal choice for industrial gas detection, in oil and gas, chemical plants (with exotic gases), steel works (special CO sensor), hospitality (CO2), renewable energy (hydrogen) and waste and water works. Weighing just 130g, it is extremely durable, with high impact resistance and dust/water ingress protection, loud 95 dB alarms, a vivid red/ blue visual warning, single-button control and an easy-to-read, backlit LCD display to ensure clear viewing of gas level readings, alarm conditions and battery life. Data and event logging are available as standard, and there is a built-in 30 day advance warning when calibration is due.
Gasman is also available in a safe area CO2 version offering 0-5% carbon dioxide measurement.


Meet the next generation of oxygen gas detection

Gasman is now available with lead free, long-life oxygen sensors

  • 5-year sensor warranty
  • Lead-free for RoHS compliance
  • Reduced sensor replacement
  • Lower cost of ownership
  • Reduced environmental impact


  • Tough polycarbonate housing – protects you in the harshest environments
  • Water and dust resistant to IP65
  • Full over moulding – high impact resistance

Effective warning

  • Two levels of instantaneous alarm and TWA alarms for toxic versions – ensures prompt evacuation from hazardous zone
  • 95dB audible alarm
  • Vivid twin red/blue visual alarm – if ambient noise is high, Gasman alerts you by vibrating and with the high impact blue/red LED alarms
  • Internal vibrating alarm


  • Versions available for flammable gas, oxygen and toxic gases – gas detector tailored to your requirements
  • Rechargeable versions for all gas types
  • Non-rechargeable versions so ideal for oxygen and toxic gases
  • Real-time TWA and peak display options
  • Fully interchangeable intelligent sensor modules

User friendly

  • One button operation – quick and easy to use
  • Backlit display for gas diagnostics and operating status – easy to read
  • Ultra lightweight; just 85g for toxic versions – comfortable to wear


Size 90 x 48 x 24 mm (3.5 x 1.9 x 0.95 ins)
Weight Flammable: 138g (4.9oz)
Toxic: 85g (3oz)
Oxygen: 129g (4.6oz)
Carbon monoxide: 139g (4.9oz)
Typical response times (T90) Flammable: 20s
Flammable (MPS): 17s
Toxic gas: 20s
Oxygen: 10s
Oxygen (Long-Life): 10s
Alarms Audible: 95dB; Multiple alarm options let you select distinctive tones for different alarm levels
Visible: Dual colors red/ blue flashing LEDs in a gas hazard
Internal vibrating alarm
Display Custom LCD with backlight, with display of gas concentration. Graphic symbols for battery (with proportional indication of remaining operation time), and display mode. Start up indication when calibration is due within 30 days, calibration overdue or service required.
Normal display: Real time gas concentration levels
Display recall: Peak readings and TWA
Data logging Full timed datalogging with adjustable sample rate, set to 1 min. data rate as default.
900 hours storage at 1 min. interval (54,000 logs), >4800 events
Battery Rechargeable lithium battery for all gas types
Non-rechargeable lithium battery for toxics and oxygen (excluding CO2)
Operating time* Rechargeable with MPS: >3days
Rechargeable: 12 hours minimum for flammable unit
Non-rechargeable: Up to 2 years
 Sampling  Optional manual aspirator
Operating temperature** -20°C to +65°C (-4°F to +149°F)
Humidity 5 – 95% RH
0 to 99% RH (O2 LL MPS)
Ingress protection IP65
Approvals Europe: Toxic or O2: ATEX II 1G Ex ia IIC T4 Ga (-20°C ≤ Ta ≤ +65°C) BASEEFA04ATEX0384
Flammable: ATEX II 2G Ex ia db IIC T4 Gb (-20°C ≤ Ta ≤ +65°C) BASEEFA04ATEX0383Flammable (MPS): ATEX II 1G Ex ia IIC T4 Ga (-20°C ≥Ta ≥ +65°C) BASEEFA04ATEX0383
International: Toxic or O2: IECEx Ex ia IIC T4 Ga (-20°C ≤ Ta ≤ +65°C) BAS05.0039
Flammable: IECEx Ex db ia IIC T4 Gb (-20°C ≤ Ta ≤ +65°C) BAS05.0038
North America: CSA Class 1 Groups A,B,C,D Division 1
Standards Europe: EN60079-0, EN60079-11, EN60079-1, ATEX 2014/34/EU
North America: CSA22.2, 152EN50270, EN50271, EN61779
PC Interface RS232 connection from interface module in charger
RS232/USB converter available
Calibration Gasman can be routinely calibrated using Portables PC software or by using Checkbox IMH
Accessories Gasman is supplied with an integral alligator clip.

Optional accessories:

Gas test kit, Gasman external filter, leather carry case, single way charger, charger interface software and communication kit (excluding PSU), 5 way multi-charger

Crowcon Connect Compatible? Yes

*Operating time will depend on operating pattern and alarm occurrence. Frequent or long lasting alarms and use of the optional confidence beep will reduce battery life.

**Toxic and oxygen sensors are not rated for continuous operation at high temperatures. Consult Crowcon if operating temperatures are likely to exceed 40°C (104°F) for extended periods.

Gases and Ranges

Required ranges and alarms vary by country and application and these can be configured as required. Each gas channel can have two instantaneous alarm levels set. Toxic units also have Time Weighted Average (TWA) alarms.

Flammable gas calibration is available for methane, propane, butane, pentane, hydrogen and
ethylene as standard.

Gasman is also available in a safe area CO2 version offering 0-5% carbon dioxide measurement.

Gas Range Standard Alarm (UK)
Ammonia (NH3)  0-1000 ppm  25 ppm
Carbon Monoxide (CO)  0-1500 ppm  20 ppm
Carbon Dioxide (CO2)  0-5% vol.  0.5% vol.
Carbon Monoxide (H2
 0-500ppm  20ppm
Chlorine (Cl2)  0-20 ppm  0.3 ppm
Chlorine Dioxide (CIO2)  0-1 ppm  0.1 ppm
Ethylene Oxide (ETO)  0-10 ppm  3 ppm
Flammable True LEL (MPS)  0-100% LEL  20% LEL
Flammable  0 – 100% LEL  20% LEL
Fluorine (F2) 0-1 ppm  0.5 ppm
Hydrogen (H2)  0-2000 ppm  N/A
Hydrogen Cyanide (HCN)  0-25 ppm  5 ppm
Hydrogen Fluoride (HF) 0-10 ppm  1 ppm
Hydrogen Sulphide (H2S) 0-250ppm  5 ppm
Nitric Oxide (NO) 0-100 ppm  25 ppm
Nitrogen Dioxide (NO2)  0-20 ppm  1 ppm
Oxygen (O2), Long-Life  0-25% vol.  19.5% / 23.5% vol.
Oxygen (O2)  0-25% vol.  19.5% / 23.5% vol.
Ozone (O3)  0-1 ppm  0.1 ppm
Phosphine (PH3)  0-5 ppm  0.1 ppm
Phosgene (COCL2)  0-1 ppm  0.1 ppm
Sulphur Dioxide (SO2)  0-20 ppm  1 ppm


Below is a small selection of the accessories available for the Gasman.

Gasman External Filter


For use in high dust environments such as steel plants.

Leather carry case


Enables unit to be worn either on a belt or with a shoulder strap.

Gas test kit


Allows calibration and gas testing. Includes – Trigger regulator with 1m gas supply tube, flow cap, magnet and 2m gas vent tube

Single Way Charger


Charger cradle. Select power supply option.

Charging lead for vehicle lighter socket


Use with 12V DC input charger cradles C01941 or C01940.


Gasman interface kit

Gasman interface kit


Gasman Interface Kit includes single way charger/interface, USB-RS232 adaptor, PC lead and multi-region PSU

5 Way Multi-Charger

5 Way Multi-Charger


To recharge 5 Gasman units at once. Select power supply option.


Single Way PC Interface Charger


Charger cradle with PC interface connection to allow data download and instrument configuration. Requires F-F PC lead (E07532) and either an RS 232 connection or RS 232 to USB convertor (C02097). Select power supply option.





Additional information

Sensor type

Electrochemical, Infra-red, Long Life O2, MPS, Pellistor


Basic Operation:

  Home screen

Includes: What the Gasman Home Screen looks like and understanding the icons. Duration: 28 seconds

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Includes: Using the Gasman cradle charger. Duration: 24 seconds

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Includes: How to activate the backlight for viewing in poor lighting conditions. Duration: 19secs

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  Gasman Menu Function Overview

Includes: Navigating Gasman menus. Duration: 54secs

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  Gasman Field Calibration

Includes: How to calibrate the Crowcon Gasman using a flow plate. Duration: 1m:57secs

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  Gasman Alarm

Includes: Gasman’s alarm display. Duration: 39secs

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  Gasman CO2 Activation

Includes: Switching Gasman CO2 on. Duration: 49secs

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  Gasman CO Activation

Includes: Switching Gasman CO on and sensor zero function. Duration: 52secs

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Advanced Features:


Includes: How to view average gas exposure measurements on a Gasman (TWA = Time Weighted Average). Duration: 46secs

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  Gasman Manual Zero

Includes: How to perform a sensor zero when in clean air. Duration: 50secs

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  Gasman Peak Mode

Includes: How to switch the display to show peak gas level readings. Duration: 31secs

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