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

  • Industry’s first 5-year 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 overmoulding – 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


Size90 x 48 x 24 mm (3.5 x 1.9 x 0.95 ins)
WeightFlammable: 138g (4.9oz)
Toxic: 118g (4.1oz)
Oxygen: 129g (4.6oz)
Carbon monoxide: 139g (4.9oz)
Typical response times (T90)Flammable: 15s
Flammable (MPS): 17s
Toxic gas: 20s
Oxygen: 10s
Oxygen (Long-Life): 10s
AlarmsAudible: 95dB; Multiple alarm options let you select distinctive tones for different alarm levels
Visible: Dual colours red/ blue flashing LEDs in a gas hazard
Internal vibrating alarm
DisplayCustom 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 loggingFull 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
BatteryRechargeable 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)
Humidity5 – 95% RH
0 – 99% RH (O2 LL)
Ingress protectionIP65
ApprovalsEurope: 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) 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
StandardsEurope: EN60079-0, EN60079-11, EN60079-1, ATEX 2014/34/EU
North America: CSA22.2, 152EN50270, EN50271, EN61779, EN45544
PC InterfaceRS232 connection from interface module in charger
RS232/USB converter available
CalibrationGasman can be routinely calibrated using Portables PC software or by using Checkbox IMH
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.

GasRangeStandard Alarm (UK)
Ammonia (NH3) 0-100 ppm 25 ppm
Carbon monoxide (CO) 0-500 ppm 30 ppm
Carbon dioxide (CO2) 0-5% vol. 0.5% vol.
Chlorine (Cl2) 0-20 ppm 0.5 ppm
Flammable 0 – 100% LEL 20% LEL
Fluorine (F2)0-1 ppm 0.1 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)0-100 ppm 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 0.2 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.

Portables PC Software CD


Enables data download, calibration and changes to instrument settings. Requires PC Interface Kit (See C011305).

Gasman Interface Kit Including Multi PSU


Gasman Interface Kit includes single way charger/interface, USB-RS232 adaptor, PC lead and multi-region PSU (Portables PC software CD [C01832] must be ordered seperately)

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.





Product Presentation