Portable Gas Detector - CROWCON (UK)


Portable multigas detector provides effective protection against 4 common gas hazards: carbon monoxide, hydrogen sulphide, flammable gases and oxygen depletion.

Offering you compliance, robustness and low cost of ownership in a simple to use solution. T4 contains a wide range of powerful features to make everyday use easier and safer.

T4 is Crowcon's personal protection solution for detecting the four most common gas hazards:

  • carbon monoxide
  • hydrogen sulphide
  • flammable gases 
  • oxygen depletion

Offering you compliance, robustness and low cost of ownership in a simple to use solution. The large single button and intuitive menu system allows T4 to be operated wearing gloves with minimal training.

Crowcon's toughest portable yet, 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, well protected from water ingress through IP65 and IP67 certification and ATEX Zone 0 approved, T4 allows uninterrupted working in the most demanding environments.

T4 contains a wide range of powerful features to make everyday use easier and safer:


Gas Pro

Crowcon Gas-Pro is a confined space entry monitoring solution for workers and fleet managers, and is now supported by the Crowcon I-Test bump test and calibration station.

Offering detection of up to 5 gases in a compact and rugged solution, Gas-Pro has an easy-to-read top mount display combining ease of use and user focused features.

An optional internal pump, activated with the flow plate, takes the pain out of pre-entry testing and allows Gas-Pro to be worn either in pumped or diffusion modes


Gas-Pro IR detects potentially explosive gases in conditions where a pellistor-based catalytic sensor may struggle, especially in a low oxygen environment. The infrared measurement gives improved reliability and measures gas in two different wavelengths: one that absorbs gas and the other does not. With little chance of being poisoned, the Gas-Pro IR is inherently safer and saves the need of regular and expensive pellistor replacement when used in likely contaminated environments.


Gas-Pro IR

The Gas-Pro IR is ideal for the oil and gas industry. This personal multigas monitor can detect methane, pentane or propane using infrared (IR) sensor technology. The Gas-Pro IR is ideal for detecting potentially explosive gases where traditional, ”pellistor”, catalytic sensors will struggle - especially in a low oxygen environment.


The infrared measurement gives improved reliability and measures gas in two different wavelengths: one that absorbs gas and the other does not. With little chance of being poisoned, the Gas-Pro IR is inherently safer and saves the need of regular and expensive pellistor replacement when used in likely contaminated environments.

The Gas-Pro Range is known for its simple use and functionality as well as easy testing and calibration. The Gas-Pro IR now completes the Gas-Pro range and gives greater flexibility for sensor selection in this 5-gas multigas detector.

Gas-Pro PID

Gas-Pro PID gives you full flexibility with a wide range of gas types to choose from. With an optional pump, the Gas-Pro PID is the perfect product addressing the requirements of a wide range of applications..

Gas-Pro PID utilises the Photo Ionization Detection technology to allow you to detect hundreds of Volatile Organic Compounds (VOCs). If you are working in an environment that is high in levels of solvents, glues, paints and general VOCs, the Gas-Pro PID will monitor your safety. With its dual-coloured display, the monitor will alert the user with its 95db audible alarm and its dual-coloured visual alarm bars.

PID Technology

Crowcon's PID works with a 10.6 electron volt lamp. This sensor is the most stable sensor on the market and offers the detection of a wide range of VOCs. The sensor has an internal UV light source, which the gas sample passes through. An electron is released for gases with an ionization potential of 10.6


Tetra 3

The Tetra:3 multigas monitor is a compact, robust and easy-to-use diffusion based detector. Single button operation, small size and clear top-mounted display make it a favourite in the market amongst those working in demanding industrial environments, such as those in the water, telecoms, food, brewing or hydrocarbons sectors..

Gases include the most common four (carbon monoxide, methane, oxygen and hydrogen sulphide), but also an expanded range: ammonia, ozone, sulphur dioxide, H2 filtered CO (for steel plants) and IR carbon dioxide (for safe area use only).


Crowcon Clip

Reliable and durable fixed life monitoring in a compact and maintenance-free package, the Crowcon Clip has a 2-year life and is available for hydrogen sulphide (H2S), carbon monoxide (CO) or oxygen (O2).


Now supported by the Crowcon C-Test which provides bump testing, event management and calibration from a simple to use wall mount station and gives fleet or safety managers the ability to update configurations on large fleets. It also maintains the all important event logs that demonstrate users are working within the company requirements. See datasheet for more info.


The Gasman full function personal single gas monitor is compact and lightweight yet is fully ruggedised for the toughest of industrial environments. Featuring simple single button operation, it has a large easy-to-read display of gas concentration, and audible, visual and vibrating alarms

Gasman is a range of rugged, compact single gas personal monitors designed for use in the toughest environments. Its stunningly compact and lightweight design makes it ideal for use in industries such as oil and gas, chemical plants (with exotic gases), steel works (special CO sensor), hospitality (CO2) and waste and water works.

Weighing just 130g, it is extremely durable, with high impact resistance and dust/water ingress protection, loud 95 dB alarms, a vivid red/ blue visual warning, single-button control and an easy-to-read, backlit LCD display to ensure clear viewing of gas level readings, alarm conditions and battery life. Data and event logging are available as standard, and there is a built-in 30 day advance warning when calibration is due.

Gasman is also available in a safe area CO2 version offering 0-5% carbon dioxide measurement


Laser Methane Mini

The LaserMethane mini (LMm) is a long-range Methane detector. An innovative portable detector which allows methane gas to be detected from a distance of up to 100m. This enables easy access to hard-to-reach locations, such as elevated piping or locked premises, and helps keep the operator away from potential leak sources..

Laser Methane mini (LMm) is a compact handheld detector that can detect methane gas from a safe distance. Utilising laser technology, methane leaks can be quickly confirmed by pointing the laser beam towards the suspected leak, or along the survey line. This revolutionary technology removes the need to access elevated places, under floor or other hard to reach areas. It is also ideal for surveying large open spaces e.g. landfills or along pipelines.

NEW LMMm-Green

LMm is now available with a green laser guide light which is more visible especially under strong sunlight. The Laser Methane Mini-Green (LMm-G) combines the benefit of LMm with additional data storage functions and comes with Bluetooth capability, which can be connected to any android device (through the Gasviewer app) for a variety of data storage functions. Important data like location, gas levels and time can also be saved or emailed to a central point.


Triple Plus+

Triple Plus+ is the latest generation of the respected "Triple" family of toxic, oxygen and flammable gas detectors. With over 90,000 units sold to oil and gas, chemical, utility and manufacturing companies worldwide, their combination of ruggedness, reliability, ease of use and sensor flexibility has set the standard for multigas portables.

Today's TriplePlus+ builds on this pedigree by inclusion of unique LIBRA lithium-ion battery technology and the option of infrared (IR) sensors for the measurement of flammable hydrocarbons or carbon dioxide.

Intrinsically safe, the Triple Plus+ provides enhanced facilities for safety and detector fleet managers including selection of flammable gas correction factors (so one unit can be used in several locations across a site) and annotation of the data file with user names and site names selected from pre-configured files in the unit.


Designed for group protection, area monitoring and providing a virtual fenceline, Detective+ is a rugged, interconnectable, multigas temporary area monitor. Building on Crowcon's experience in pioneering this category of detector, Detective+ has earned a reputation for reliability and versatility in demanding environments stretching from offshore platforms to the sands of the Middle East.

Rugged and robust, Detective+ features either fixed or folding legs and a protective frame that allows stacking for easier storage.

Available with an optional internal pump for sampling versatility, alarms are announced with an extremely loud sounder, while multiple beacons ensure 360 degree visibility.

Detective+ may now also be equipped with infra-red (IR) sensors, providing either CO2 detection, or allowing higher levels of flammable gas monitoring. IR sensors also provide immunity to the poisoning effects which standard flammable gas sensors can suffer from. This extends sensor life and further increases measurement confidence in tough applications such as water treatment plants and certain chemical or hydrocarbon processing facilities.


Detective Wireless

Detective Wireless is a module that can replace interconnecting cables for Detective+. Detective Wireless will transmit gas alert signals and other alarms wirelessly between Detective units using a 433MHz signal up to 100 metres in distance.

Detective Wireless uses the proven RICOCHET mesh network. When establishing a mesh network, Detective Wireless automatically selects the best line to give strongest interconnections. Should wireless connection between two devices weaken, the network will ‘self-heal’ and automatically re-route communications via alternate RICOCHET enabled devices, creating a mesh type network that provides a more robust and efficient wireless network.

When Detective+ goes into alarm, the signal will be sent to other units alerting the user to gas being present in the area. If the signal is weak due to heavy metal work being present the Detective Wireless can be used as a repeater to boost the signal between units. In a confined space the unit can use up to 20 metres of cable to position the unit in a location that will increase signal.




Tetra is a flexible multigas monitor for the detection of flammable gases, oxygen and a wide range of toxic gases. Available in rechargeable or disposable battery format and with or without an internal pump, it is used extensively in the utilities, chemicals and hydrocarbon processing markets.

Intrinsically safe, Tetra is one of the only portable gas detectors with embedded software designed to the exacting requirements of IEC 61508-3, guaranteeing reliable and dependable operation.

Features include:

  • Up to four gases measured
  • Infra-red carbon dioxide sensor version for safe area use (ie non-explosion risk areas)
  • Digital interchangeable i-module sensors for full flexibility
  • Loud 94dBA audible alarm with selectable tones
  • Unique dual colour red/blue visual alarm
  • Built in vibrating alarm as standard
  • Rugged and robust, IP65 ingress protection
  • Simultaneous 4 gas display with automatic backlight
  • Peak mode operation
  • TWA reading recall
  • Data & event logging
  • Simple IR interface to PC

Crowcon Pump and Calibration Kit

With regulations driving tighter calibration routines and the requirement for daily bump testing, there is a real need for test gas. Gas detectors play a key part for people and plant safety so equipment cannot afford to be out of service.

We understand our customer's requirements. We now offer a full range of bump and calibration gas with a range of accessories for all your portable and fixed gas detector testing and calibration needs.

Crowcon has gas distribution centres in the UK, mainland Europe, Singapore, UAE and North & South America, so it has never been easier to buy gas you require, ensuring your fleet of fixed and portable devices are compliant.

NEW! Make bump testing easier

Bump testing has always been a challenge for mobile users with the difficulties and cost of transporting gas and regulators. After listening to your needs, Crowcon have found a solution to make bump testing easier.

Crowcon's Bump Gas Spray is a can that comes with a nozzle for easy testing of equipment.Simply attach the straw onto the nozzle and spray a small amount of gas into the unit's calibration cap.

The unit will then go into alarm and show you that it is fully functional with audible and visual checks.




I-Test & I-Test Manager

I-Test is Crowcon's fully automated solution for testing and verifying that your Gas-Pro and T4 are in a compliant state to carry out your daily work. Bump testing standards are getting tighter in all regions and the need for controlled bump and calibration records is a must. I-Test and the accompanying I-Test manager software makes this as easy as can be. It takes less than 1 minute to complete a bump test!


When the Gas-Pro or T4 are inserted inserted into I-Test, no button presses are required and I-Test starts testing automatically. A bump test takes less than 1 minute. The test carries out verification that the sensors are responding to a known value of gas, and filters are clear and good for use. It will also ensure the audible and visual alarms are working, giving the user full confidence that they are compliant for site use. 

I-Test is easy to use with no requirements to turn on and off the gas: the design of the demand flow regulator coupled with the I-Test will allow the automatic pull of the correct required amount and concentration of gas. I-Test can also recognise cylinders that are empty or those that have expired allowing full compliance.

I-Test stores all bump and calibration results and this can then be interrogated using the I-Test Manager software. This powerful software allows you to carry out exception reporting to see who has and hasn’t carried out their bump or calibrations. I-Test Manager also makes it very easy to print both bump and calibration certificates and any tailored reports you have generated.


  • Stand alone calibration allows you to calibrate all sensors in the Gas-Pro and T4, even if the sensors are not due a calibration.
  • I-Test now supports all Gas-Pro flammable sensor configurations, including methane, propane, butane, pentane and hydrogen. Bump testing and calibration can be performed with the target gas, or using methane. So if you have fleet of methane, butane and pentane Gas-Pro, I-Test can bump test them all using methane
  • I-Test automatically updates the date and time in your Gas-Pro and T4. When the clocks change for daylight savings, I-Test will update Gas-Pro and T4 as soon as it sees them.