Avo Battery BLR121

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Crowcon T4 Gas Detector

£429.60 £358.00
Availability: In stock
Crowcon T4 Gas Detector

The T4 provides advanced protection for those working in harsh environments. This portable Crowcon multigas detector, which is exceptionally easy to use and service, protects against the four most prevalent gas hazards: carbon monoxide (CO), hydrogen sulphide (H2S), flammable gases and oxygen (O2) depletion.

Crowcon T4 Gas Detector with 4 gas sensors fitted H2S, 02, C0, & CH4 supplied with internal rechargeable battery and cradle charger

T4 is supplied complete with Calibration Certificate Traceable to National Standards when purchased new from us at no extra cost.

Other sensor combinations are available please Contact us if you require any further information regarding Crowcon T4 Gas Detector



The T4 is a reliable and robust personal monitor which are sized to be worn and simple to use.
T4 is a portable monitor capable of detecting up to 4 gases in a compact and wearable design. Focused on users and fleet
managers alike, T4 offers application focused solutions giving greater operating time and reduced set up time.
T4 is classified for use in hazardous areas and gives loud and bright audible and visual alarm indications as well as a vibrate
alert. The front mount display is backlit for ease of use, and the simple single button solution makes using and training quick
and easy.

Crowcon T4 Gas Detector is a personal multi gas monitor solution for detecting the four most common gas hazards:

  • carbon monoxide (CO)
  • hydrogen sulphide (H2S)
  • flammable gases 
  • oxygen (O2) depletion

Gases and Ranges:




Oxygen (O2)

0-30% vol.

0.1% vol.


0-100% LEL

1% LEL

Hydrogen sulphide (H2S)

0-100 ppm

1 ppm

Carbon monoxide (CO)

0-1000 ppm

1 ppm

The Crowcon T4 offering you compliance, robustness and low cost of ownership in a simple to use solution, with one sensor for every gas, ensures effective, fast and reliable detection.  The large single button and intuitive menu system allows minimal training and easy operation while wearing gloves.

Durable by design the T4 includes an integrated rubber boot as standard. An optional clip-on filter cover which is easily removed and replaced ensures sensors are protected. Drop tested to 4 metres on concrete and well protected from water and dust ingress through IP65 and IP67 certification. The Crowcon T4 is ATEX approved and UL Class 1 Div 1 for operation in the widest range of environments.


The T4 allows uninterrupted work to make everyday use easier and safer, containing features:

TWA Resume

  • Unique to Crowcon T4 Gas Detector, the TWA Resume function ensures toxic gas exposure is calculated accurately over an entire shift, even if it is switched off for a break or during travel to another site.
  • When most portable detectors are turned off, the algorithm that assesses TWA exposure assumes that it’s the end of the shift. When turned on again, these detectors act as if it is a new work shift, ignoring all previous measurements. The TWA Resume function however, provides the option to include previous measurements from within the correct time frame.

Multiple alarms

  • An audible 95dB alarm with bright red/blue LED’s flashing and vibrating alerts to the provide effective warning to gas hazards.

18-hour battery

  • With a battery life of 18 hours this allows multiple or longer shifts to be worked between recharging.

Positive Safety

  • Crowcon's visual 'traffic light' indication, provides constant visual assurance that the gas detector is operating soundly and conforms to site bump test & calibration policy. The bright green and red Positive Safety LEDs are visible to all and offer a quick, simple and comprehensive indication of monitor status to both the user and others around them.  

Backlit display

  • Large, clear display with backlight and option to flip the screen 180° for easy viewing whilst worn.


  • Multiple charging options
  • Portables Pro 2.0 software for accessing advanced features and data logs
  • Clip on dust filter plates for extra sensor protection in dirtier environments
  • I-Test which makes easy work of calibrating, bump testing and managing larger fleets of Crowcon T4 Gas Detector's
What's Included:
  • Crowcon T4 Gas Detector
  • Cradle Charger
  • Intergrated Alligator clip and Tethering Loop
  • Bump/Calibration Plate


135 x 80 x 35mm


282 grams


Drop tested 4m onto concrete







Bright red & blue LED’s


Front mounted, backlit, 180° flip for easy viewing while worn




130 Hrs of data at 10s intervals



Rechargeable Li-on

Up to 18 Hr runtime; 5.5 hr recharge


Operating temp


Ingress protection

-20 to +55°C*

10-95% RH @ 40°C non-condensing

Independently tested to IP65 and IP67



Directive 2014/30/EU






Ex db ia IIC T4 Gb -20°C ≤ Ta ≤ +55°C

Ex d ia IIC T4 Gb Tamb -20°C to +55°C

Use in hazardous locations Class 1 Div 1 groups A, B, C, D only as to intrinsic safety

Ex db ia IIC T4 Gb -20°C ≤ Ta ≤ +55°C



Included with T4

Integrated alligator clip and tethering loop

Bump/calibration plate

Available separately

Single unit cradle charger, 10-unit cradle charger, Vehicle charger

Clip on dust filter plate

I-Test automated bump test and calibration station

*Toxin & oxygen sensors are not rated for continuous operation above 50°C

Glanford Electronics are Crowcon Approved Distributors

Crowcon T4 is supplied complete with Calibration Certificates Traceable to National Standards when purchased new from us at no extra cost.

Contact us if you require any further information regarding Crowcon T4 Gas Detectors

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