Crowcon are an industry leading brand for single and multi-gas detectors, known for their reliability and robustness.

About Crowcon

Recognisable by their orange and blue casing, Crowcon products are used throughout industry to protect workers’ personal safety. Crowcon’s range of fixed gas detectors including the MPS is now the most advanced sensor for the Hydrogen detection market.

Site Survey

Whether you’re unsure of which equipment you need or how best to use it, a1-cbiss can conduct a site survey and by working on a range of factors we’ll calculate what you need

Fast Delivery

With stock items and small lead times, expect a fast delivery from a1-cbiss

Preventative Maintenance

Problems are less likely to arise if your equipment has a regular service plan.


Get the skills to work safely with our accredited 3M training courses

Total Personal Safety

a1-cbiss can supply a wide range of products for everything related to gas detection – Personal gas detectors, Spot Check Tubes, Respirators, Harnesses, Fixed gas detection systems and more

Crowcon T4 Gas Detector


The Crowcon T4 portable multigas detector provides effective protection against 4 common gas hazards: carbon monoxide, hydrogen sulphide, flammable gases and oxygen depletion. Now with improved detection of pentane, hexane and other long-chain hydrocarbons.

As a user of T4, it’s good to know that it’s Crowcon’s toughest portable yet. The T4 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, T4 allows uninterrupted working in the most demanding environments.

TWA Resume

If you have a responsibility relating to health & safety, take note of this unique feature specific to the T4. The TWA Resume function ensures toxic gas exposure is calculated accurately over an entire shift, even if T4 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.

Crowcon T4 Gas Detector

The Crowcon T4 Gas Detector is complemented by a range of accessories including:

    Multiple charging options
    Portables Pro 2.0 software for accessing advanced T4 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 T4s