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Crowcon Gasman Single Gas Personal Gas Detector - Rechargeable Version

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Note: this version of the Crowcon Gasman has a rechargeable battery, but does NOT include the charger as standard. You can order this separately by following this link. A separate, non-rechargeable version for several gases is also available.

Sensor Information

The six most popular, standard Crowcon Rechargeable Gasman Single Gas Detectors are listed in the above drop-down box. These include:

  • GSR-01-EA-Z: 0-100% LEL Methane (CH4)
  • GSR-02-EA-Z: 0-25% vol. Oxygen (O2)
  • GSR-03-EA-Z 0-500ppm Carbon Monoxide (CO)
  • GSR-04-EA-Z: 0-100ppm Hydrogen Sulphide (H2S)
  • GSR-05-EA-Z: 0-5% vol. CO2 IR Safe Area
  • GS-AS-A-001: 0-1000ppm Ammonia

However further gas sensor options and possible combinations of gas sensors are also available. The table below details the possible gas sensors available on the Crowcon Rechargeable Gasman. For further information, or to place an order for a Gasman featuring the sensors below, please contact our sales team and we will be more than happy to assist you with your purchase. 

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
AG 0-25% volume oxygen
AI 0-100ppm hydrogen sulphide
BF 0-250ppm hydrogen sulphide
AH 0-500ppm carbon monoxide
CS 0-500ppm carbon monoxide (H2 filtered)
BI 0-1500ppm carbon monoxide
AN 0-20ppm chlorine*
AR 0-100ppm ammonia
AS 0-1000ppm ammonia
AJ 0-20ppm sulphur dioxide
AP 0-1ppm ozone*  (includes ozone specific flow plate)
AL 0-20ppm nitrogen dioxide*
AK 0-2000ppm hydrogen
AQ 0-30ppm hydrogen cyanide
AT 0-5ppm phosphine*
AV 0-10ppm hydrogen fluoride*
AU 0-1ppm fluorine*
BB 0-1ppm phosgene*
CK 0-1ppm chlorine dioxide
CQ 0-100ppm nitric oxide
CI 0-10ppm ethylene oxide (rechargeable only)
HG 0-5% carbon dioxide IR (uncertified, for safe area only)
* Reactive gases - extra care is required during sampling and calibration due to the nature of these gases. Contact Crowcon technical support or review the product manual for further detail. 


Please note that as standard all our Crowcon Rechargeable Gasman Detectors are configured to comply with the English ATEX region and standard, however other configurations are available, please contact our sales team for more information, or to place an order for a Gasman configured to one of the regions and standards below. 

Region Code  Description
001 English ATEX 
012 N American CSA
015 Br Port INMETRO
004 Spanish ATEX 
006 German ATEX
007 Dutch ATEX 
008 Italian ATEX 
003 French ATEX 
017 Polish ATEX 

 Crowcon Rechargeable Single Gas Personal Gas Detector Description

The Crowcon Gasman is an intrinsically safe personal gas monitor designed to alert you to the presence of a single gas.

Every Gasman is configured with 2 levels of instant response alarms, ensuring you can evacuate quickly, as soon as gas content is present. When gas is detected, the Gasman will use a combination of three different alarms to ensure you are alerted instantly. The following alarms are included:

  • 95dB loud audible alarm
  • Vivid twin red/blue visual alarms
  • Internal vibrating alarm

Crowcon's Gasman detectors are made tough - they have a rugged polycarbonate housing designed for use in demanding conditions. The case is water and dust resistant to IP65 and has full overmoulding to protect against impact damage. At the back of the case, the Gasman includes a clip which you can use to attach the detector to your clothing for comfortable, hands-free instant gas detection.

The Gasman is controlled by a single button for ease of use - using this, you can select between standard display of gas content, peak display (shows the highest value of gas detected), reset the peak function and also zero the unit in clean air to maintain overall accuracy.

By combining the Gasman together with Crowcon's optional RS232 communications link (available with the single way charger interface, part no. CO1940), you can also access logged gas readings over a period of time. The Gasman is configured to record data every minute (can be adjusted with the PC software) and up to 900 hours of data can be stored (assumes 1 minute intervals). The logging facility can also store switch on/switch off, level 1 and level 2 alarms, alarm off, peak level during alarm, zero, calibration, gas tests and other parameters!

Intrinsic Safety Rating

The Crowcon Gasman is designed to be used in potential hazardous environments where there is a risk of igniting the atmosphere.

These units have the following ATEX and IECEx classifications (please ensure the environment you're working in is compliant with these regs).


  • ATEX II 1G Ex ia IIC T4 Ga, (-20°C ≥Ta≥ +65°C) Toxic/Oxygen
  • ATEX II 2G Ex ia d IIC T4 Gb, (-20°C ≥Ta≥ +65°C) Flammable
  • Class I Division 1, Groups A, B, C and D
  • Class I Division 1, Groups A, B, C and D


  • IECExBAS05.0038 Flammable Gas
    ECExBAS05.0039 Oxygen or Toxic Gas

Crowcon Gasman Single Gas Detector Key Features

  • Portable, wearable gas detector made for the detection of a single gas
  • Made tough - rugged polycarbonate housing with IP65 water/dust resistance and overmoulded case to protect against impact
  • Clip on the back for easy attachment to your clothes
  • 2 levels of instantaneous alarms - ensure you are alerted straight away when gas levels rise
  • Triple alarms ensure you never miss an alert - audible tone at 95dB, flashing red/blue LED indicators plus vibration
  • Rechargeable battery inside (please note that the charger is sold separately)
  • One button operation - easily switch between different settings
  • ATEX/IECEx compliant for use within hazardous environment
  • Fully interchangeable intelligent sensor modules
  • Backlit display - ideal for gas diagnostics and operating status
  • Ultra lightweight, comfortable design
  • Data logging capabilities with adjustable sampling rate (requires PC interface kit, sold separately)
  • 12 hour minimum battery life

Optional Accessories

Need the charger for your Gasman or other accessories? Please call our sales team quoting one of the part numbers below and they can add it to your order!

For a more comprehensive breakdown of the accessories, please download the manual available further below.

Part Number  Description
C02132 Gasman External Filter
M04851 Flow Cap Assembly
C01937 Aspirator Assembly
C01843 Shoulder Strap
C01844 Chest Harness Strap Kit - consists of two straps (harness plate sold separately)
C011304 Chest Harness Kit (harness plate and 2 straps)
C01983 Leather Carry Case - either wear on belt or use with shoulder strap
C01892 Gas Test Kit (includes trigger regulator with 1m gas supply tube, flow cap, magnet and 2m gas vent tube)
E07532 PC Lead (9 way D, female to female)
C02097 USB to RS232 Adaptor
C011318 Single Way Charger with Multi-Region Power Supply
C01296 Charging Lead for Vehicle Lighter Socket Lead
C01940 Single Way Charger/Interface 12V DC Input
C01941 Single Way Charger 12V DC Input
Part CodeGSR-02-EA-Z

Crowcon Gasman Technical Specifications

Dimensions 90 x 48 x 24mm (3 1/2 x 1.9 x 1 inches)
Weight 138g (Flammable)
129g (Oxygen)
118g (Toxic)
Housing, Degree of Protection Ingress Protection IP65 (NEMA 4)
Operating Temperature -20 to 55°C (-4 to 131°F)
Humidity 20-99% RH, non-condensing for continuous operation
Display Custom LCD with backlight. Starburst characters for number and text display, plus screen icons for status and mode
Warm-Up Time 90 seconds maximum
Response Time (Typical) Approx 20 seconds for most toxic and flammable sensors, 10 seconds for oxygen
Audible Alarms 95dBa (multiple alarm sounds allow selection of distinctive tones for different alarms)
Visible Alarms Dual colour red/blue flashing LEDs in gas hazard
Vibrating Alarm Internal vibrating alarm
Repeatability ±2% FSD, 6 months
ATEX Essential Health and Safety Requirement, clause 15.9
Safety Certificate No. BASEEFA04ATEX0383 Flammable Gas
BASEEFA04ATEX0384 Oxygen or Toxic Gas
IECEx IECExBAS05.0038 Flammable Gas
IECExBAS05.0039 Oxygen or Toxic Gas
European Approval Codes ATEX II 1G Ex ia IIC T4 Ga, (-20°C ≥Ta≥ +65°C)
ATEX II 2G Ex ia d IIC T4 Gb, (-20°C ≥Ta≥ +65°C)
USA Approval Codes Class I Division 1, Groups A, B, C and D
Canadian Approval Codes Class I Division 1, Groups A, B, C and D
Standards (Safety) EN60079-0, EN60079-1, EN60076-11, 94/9/EC
Standards (Safety) Canada CSA22.2, 152
Operation EN50270, EN50271, IEC61508, EN61779
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