T4x is Crowcon’s zone 0 approved personal protection solution for detecting the four most common gas hazards:

      • Carbon Monoxide (CO)
      • Hydrogen Sulphide (H2S)
      • Flammable Gases (MPS)
      • Oxygen Depletion (O2)

Now with improved detection of pentane, hexane and other long chain hydrocarbons.

Offering you compliance and low cost of ownership in a simple to use solution. The large single button and intuitive menu system allows T4x to be operated wearing gloves with minimal training.

T4x is durable by design and includes an integrated rubber boot as standard. An optional clip-on filter cover, which is easily removed and replaced, ensures sensors are protected in the dirtiest environments. Drop tested to 4m and well protected from water ingress through IP65 and IP67 certification, T4x allows uninterrupted working in the most demanding environments.

Eliminates poisoning and cuts number of sensor replacements

Achieve more with less resources, T4x eliminates poisoning and cuts number of sensor replacements by 75% only 1 sensor needs replacing over the device’s lifetime.

Go to gas detector for all confined spaces involving oxygen

T4x is the only go to gas detector for all confined spaces involving oxygen, as it detects over 15 flammable gases at once straight out the box, as well as O2, and H2S and CO.

Enhanced battery life

35+ hours battery life (double the battery life of our original T4) allows multiple or longer shifts to be worked between recharging.

Sensor types

MPS: Advances molecular property spectrometer (MPS™) sensor technology that detects and accurately identifies over 15 different flammable gases in one device.

Dual Toxic: Utilising a 3 year life dual toxic sensor (CO and H2S). You get the same performance of individual sensors in one package reducing costly replacements with tried and tested technology.

Long-life Oxygen: This long-life Oxygen sensor with 5 year warranty and RoHS lead free compliance saves you money and delivers on safety and environmental regulation.


Size W135 x H80 x D35 mm (5.3 x 3.1 x 1.4in)
Weight 282g (9.9oz)
Durability Drop tested to 4m onto concrete
Alarms Audible >95dB
Bright red/blue visual LEDs
Integrated vibrating alert
Display Front mounted, backlit. Optional 180° flip for easy viewing whilst worn
Logging 130 hours of data logging; Up to 3500 events
Battery Rechargeable Li-ion
Up to 18 hour typical runtime (Standard sensor option)Up to 35 hours runtime (MPS and LLO2 options)
5.5 hour recharge
Operating temperature -20°C to +55°C (-4°F to +131°F)*
Humidity 10 to 95% RH @ 40°C non-condensing
Ingress protection Independently tested to IP65 and IP67
Approvals ATEX and UKCA II 1 G Ex ia IIC T4 Ga -20°C ≤ Ta ≤ +55°C (T4 Type 1)

IECEx Ex ia IIC T4 Ga -20°C ≤ Ta ≤ +55°C (T4 Type 1)

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

MED Directive 2014/90/EU (Pending)

Interface USB communications lead
Accessories 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 filter plate for sensor protection in dusty environments
I-Test automated bump and calibration station

Crowcon Connect Compatible? Yes

* Toxic and oxygen sensors are not rated for continuous operation above 50°C (122°F)

Gases and Ranges

Gas Range Resolution
Long-Life Oxygen (O2)  0-30% Vol.  0.1% Vol.
Flammable (MPS)  0-100% LEL  1% LEL
Hydrogen sulfide (H2S)  0-100ppm  1ppm
Carbon monoxide (CO) 0-1000ppm  1ppm


Below is a small selection of the accessories available for the T4x.

Bump/Calibration plate


For applying test gas to T4x

External filter plate


Clip-on filter for additional protection in dusty environments. Protects the sensors from contamination.



Easy automated bump testing and calibration solution.

Cradle charger


Docking station for easy charging. Includes multi region power supply.

10 way charger


Charge and store up to 10 units. Requires only a single power outlet.
*Not available for UL certified products.

Vehicle charger


Charge and store securely during transit.

*NEW* Portables Pro software


Newer version – clean, easy and intuitive to use.
Service edition makes servicing T4x very easy.
Visit software downloads to download.

USB communications lead


For PC connection to T4x





Power and Communication Cables


Basic Operation:


Includes: Switching T4 on, sensor zero and TWA Resume functions. Duration: 1m:37secs

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  Home screen

Includes: T4 gas level display home screen. Duration: 18secs

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Includes: Switching T4 off. Duration: 22secs

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Includes: Using the T4 cradle charger, 10 way charger and vehicle charger. Duration: 45secs

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Includes: Activating the display backlight. Duration: 19secs

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Advanced Features:

  Quick view

Includes: View status information without switching T4 on. Duration: 1m:02secs

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  Information screen

Includes: View status information during operation. Duration: 1m:01secs

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Includes: View average gas exposure measurements. Duration: 37secs

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Includes: View average gas exposure measurements. Duration: 40secs

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  Peak mode

Includes: Switch display to peak level readings. Duration: 57secs

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  Manual zeroing

Includes: Perform a sensor zero when in clean air. Duration: 31secs

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  Gas sampling

Includes: Using the T4 aspirator plate and hand bulb to sample gas. Duration: 1min19secs

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Bump Testing:

  Manual bump

Includes: Bump test T4 using the clip-on bump/calibration plate. Duration: 1m:10secs

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  I-test bump

Includes: Bump test T4 using the automated I-Test bump and calibration station. Duration: 1m:12secs

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Additional Information:

T4 user manuals and datasheets can be found in our downloads