Crowcon Gasman Single Gas Detector

Code: Gasman II
  • Single gas monitor
  • Robust
  • Ultra-lightweight

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The Crowcon Gasman is a single gas detector with a choice of sensors, including Combustible, Toxic and Oxygen. Compact and designed for use in harsh environments.  Data and event logging are included on all models.  A Carbon Dioxide instrument measuring 0-5% using an infrared sensor is also available, for use in safe areas only. 

Toxic gas and oxygen versions are available in rechargeable and non-rechargeable variants. The flammable gas models are rechargeable only. The Gasman is the perfect choice for detecting specific gases with a monitor that can be serviced to extend its lifetime.  Equipped with loud and bright alarms built in an unobtrusive compact and lightweight design. Single-button operation minimises training time.

Suitable for use in a range of industries including oil and gas, chemical plants (exotic gases), steelworks (CO compensated sensor) hospitality (CO2) and the water industry.


  • Tough polycarbonate housing
  • Water and dust resistant to IP65
  • Full over-moulding – high impact resistance


  • Two levels of instantaneous alarm and TWA alarms for toxic versions
  • 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


  • Backlit display for gas diagnostics and operating status – easy to read
  • Ultra-lightweight; just 85g for toxic versions – comfortable to wear
  • Real-time TWA and peak display options
  • Calibration reminder, 30-day advance warning
  • Fully interchangeable intelligent sensor modules
  • Approvals; ATEX, IECEx, INMETRO & CSA

Gasman supplied with a calibration flow cap, alligator clip and instruction manual.

Gas Range Typical Alarms
Ammonia (NH3) 0-1000ppm 25ppm
Carbon monoxide (CO) 0-1500ppm 30ppm
Carbon dioxide (CO2) 0-5% 0.5%
Carbon monoxide (H2 filtered) 0-500ppm 30ppm
Chlorine (CL2) 0-20ppm 0.3ppm
Chlorine Dioxide (CIO2) 0-1ppm 0.1ppm
Ethylene Oxide (ETO) 0-10ppm 3ppm
Flammable 0-100% LEL 20% LEL
Fluorine (F2) 0-1ppm 0.5ppm
Hydrogen (H2) 0-2000ppm N/A
Hydrogen cyanide (HCN) 0-25ppm 5ppm
Hydrogen fluoride (HF) 0-10 ppm 1ppm
Hydrogen sulphide (H2S) 0-250 ppm 5ppm
Nitric oxide (NO) 0-100 ppm 25ppm
Nitrogen dioxide (NO2) 0-20 ppm 1ppm
Oxygen (O2) 0-25% 19.5%/23.5%
Ozone (O3) 0-1 ppm 0.1ppm
Phosphine (PH3) 0-5 ppm 0.1ppm
Phosgene (COCI2) 0-1 ppm 0.1ppm
Sulphur dioxide (SO2) 0-20 ppm 1ppm

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Title Size
Gasman-Datasheet 336 KB
Gasman-User-Manual-Issue-11 888 KB

Additional information

Weight 0.190 kg

Ordering Information

Rechargeable single-use shortcodes, common models
GSR-01-XX-Z Rechargeable, 0-100% LEL methane (CH4)
GSR-02-XX-Z Rechargeable, 0-25% vol. oxygen (O2)
GSR-03-XX-Z Rechargeable, 0-500ppm carbon monoxide (CO)
GSR-04-XX-Z Rechargeable, 0-100ppm hydrogen sulphide (H2S)
GSR-05-XX-Z Rechargeable, 0-5% vol. CO2 IR safe area
Non-rechargeable single-use shortcodes, common models
GSA-02-XX-Z Non-rechargeable, 0-25% vol. oxygen (O2)
GSA-03-XX-Z Non-rechargeable, 0-500ppm carbon monoxide (CO)
GSA-04-XX-Z Non-rechargeable, 0-100ppm hydrogen sulphide (H2S)
Gasman Flammable Calibrations


Sensor code Description
AA 0-100% LEL methane
AB 0-100% LEL propane
AC 0-100% LEL pentane
AE 0-100% LEL ethylene
AF 0-100% LEL hydrogen
AD 0-100% LEL butane
BC 0-100% LEL methane (unfiltered)
BD 0-100% LEL ethanol (unfiltered)
BE 0-100% LEL IPA (unfiltered)
KF 0-100% LEL pentane (unfiltered)


C03334 Torx T6 tool for star headed screw
C02132 Gasman external filter
C01937 Aspirator assembly
C01952 Harness plate – use with the shoulder strap or chest harness straps
C01843 Shoulder strap
C01844 Chest harness strap kit – consists of two straps (harness plate sold separately)
C011304 Chest harness kit (harness plate and two straps)
C01983 Leather carry case – either wear on a belt or use with shoulder strap
C01953 Hard hat clip
C01892 Gas test kit (includes trigger regulator with 1m gas supply tube, flow cap, magnet and 2m gas vent tube)
Battery Chargers/Interfaces


C011318 Single way charger with multi-region power supply
C01296 Charging lead for vehicle lighter socket lead
C01940 Single way charger/interface 12Vdc input
C01941 Single way charger 12Vdc input
C011305 Charger interface kit (includes single way charger/interface, USB-RS232 adaptor and PC lead, multi-region power supply )
C011319 Single way charger/interface with multi-region power supply
Multiway Chargers/Interfaces


C01951 5-way multiway charger without power supply
C011041 5-way multiway charger with 90-260V in-line power supply, US power supply
C011042 5-way multiway charger with 90-260V in-line power supply, UK power supply
C011043 5-way multiway charger with 90-260V in-line power supply, EU power supply
PC Interface


E07532 PC lead (9 way D, female to female)
C02097 USB to RS232 adaptor
Gasman Charger Power Supplies


C03580 Multi-region power supply (includes UK, EU, US and Australian plug adaptors)
E07693 Power supply for multiway charger 90-260V
Gasman calibration docks


GT-GM-03 Gasman Calibrator

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