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Combustible gas detector – Explosimeter

The explosimeter, or combustible gas detector is a device for detecting explosive or combustible gas leaks in ambient air. It is most often a portable device using the principle of catalytic combustion calibrated with methane, hexane or pentane, gases present in gasoline vapors whose lower explosive limits are among the lowest.

Explosimeter combustible gas detector for explosive, flammable and oxidizer gas leak LEL monitoring
  • Detection of explosive combustible gas

    Explosive gases, also known as EXPLO gases or combustible gases, detected by explosimeters collect a large number of gases that can ignite or explode at certain concentrations. Among the most known are natural gas, LPG (butane, propane), pentane, hydrogen, hydrocarbons, alcohols, solvents, ammonia, etc.

    The detection of combustible gas is measured from 0 to 100% LEL (Lower Explosive Limit: minimum concentration that can cause the gas to ignite or explode) and the explosimeter generally indicates the concentration in 1% steps. Depending on the substance, the LEL value differs: for example 2.5% for methane, 4% for hydrogen, 3.3% for ethanol or 15% for ammonia.

  • Combustible gas leak detector measurement technology

    An explosimeter or a fixed combustible gas detector mainly uses 2 types of technologies:

    The catalytic sensor explosimeter

    Catalytic diffusion gas detection sensors are the most widely used devices for the detection of combustible gases and vapors. This excellent value for money measurement technology has three main disadvantages:

    • Can only operate with a minimum oxygen concentration greater than 10% (totally ineffective in an inert environment).
    • Premature wear in case of frequent or permanent combustible gas detection (even in case of low LEL values).
    • High sensitivity to poisons like silicone, lead or sulfur compounds.

    The infrared combustible gas detector

    The infrared absorption sensors are mainly used for the detection of certain combustible gases (when the IR curve is available). This is a more expensive technology than the catalytic diffusion technology but it has many technical advantages:

    • Very long lifetime.
    • Immunity against catalytic poisons.
    • Operating in inert atmospheres (without oxygen).

  • The ATEX explosimeter

    The ATEX certification indicates the ability of equipment to integrate a so-called ATEX zone (for EXplosive ATmosphere), with a high risk of explosion requiring secure equipment (not promoting incident triggering: flame, spark, etc. ). An ATEX explosimeter (or an ATEX combustible gas detector) approved for use in an explosive atmosphere guarantees maximum safety for all teams working in at-risk areas.

    A combustible gas monitor, or LEL detector is a personal protective equipment used in many areas classified as ATEX zones such as certain manufacturing or oil and gas industries. These PPE are also used to secure an operation when entering confined spaces. The explosimeter is also an integral part of the firefighting equipment.

    At the same time, in many applications a fixed combustible gas detector is very often deployed in a complete system connected to a gas controller. The ATEX explosive gas transmitter makes it possible to secure entire installations subject to this type of risk. These fixed gas detectors are found, for example, in refineries, factories manufacturing solvents or paints, in distilleries, etc.

Portable combustible gas detectors - Explosimeters

ATEX modular explosimeter to monitor combustible gases (natural gas, butane, propane, hydrocarbons, solvents…) with the opprtunity to add additional O2, CO, H2S sensors.

MX4-EXPLO combustible gases detector (explosimeter)

ATEX modular explosimeter to monitor combustible gases (natural gas, butane, propane, hydrocarbons, solvents…) with the opprtunity to add additional O2, CO, H2S sensors.

Portable gas detector MX4-Explo
  • Gas detection: combustible gases from 0 to 100 % LEL
  • Polycarbonate materials with robust and waterproof overmold.
  • Audible (95 dB at 30 cm), visual and vibrating alarm.
  • Longlenght battery, 12 hours continuous.
  • Optional slide on pump to draw samples.
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The X-am 2500 portable 4 gas monitor has been especially designed to accurately monitor concentrations of 1 up to 4 gases:  combustible gas (0 - 100% LEL) oxygen (O2), carbon monoxide (CO), hydrogen sulfide (H2S), nitrogen dioxide (NO2) and sulfur dioxide (SO2). The device is guaranteed for 3 years.

  • 4 gas monitor: Drager portable multi gas detector for oxygen O2,CO, H2S, NO2, and SO2 monitoring

Portable 4 gas monitor X-am 2500

The X-am 2500 portable 4 gas monitor has been especially designed to accurately monitor concentrations of 1 up to 4 gases:  combustible gas (0 - 100% LEL) oxygen (O2), carbon monoxide (CO), hydrogen sulfide (H2S), nitrogen dioxide (NO2) and sulfur dioxide (SO2). The device is guaranteed for 3 years.

4 gas monitor: Drager portable multi gas detector for oxygen O2,CO, H2S, NO2, and SO2 monitoring
  • Large LCD display for easy concentrations reading
  • High capacity battery for over 12 hours operation
  • Ergonomic and robust design, ATEX approved
  • Long-lasting specific sensors
  • Available with optional pump for remote sampling
Additional information

Especially designed for use in hazardous atmospheres, the X-am 2500 portable multi gas detector is ATEX approved for zone 0 (permanent explosive atmosphere). This small 4 gas monitor can accurately and reliably detect the presence of up to 4 gases among O2 (oxygen), CO (carbon monoxide), H2S (hydrogen sulfide), NO2 (nitrogen dioxide) and SO2 (sulfur dioxide).

The powerful tiny sensors of the X-am 2500 multi gas detector allow safe and reliable detection of hazardous gases concentrations. Thus these high performance gas detection sensors are ideally well-suited for industrial applications and refineries. Moreover, thanks to their unique design, these gas detection sensors feature a long-lasting shelf life – up to 5 years for O2, CO and H2S sensors. This high sensor durability then enables reduction of gas detection related operating costs.

Thanks to its compact and lightweight design associated to a robust crocodile clip, the X-am 2500 portable 4 gas monitor can be easily and comfortably worn on a belt or on a collar without disturbing the user. Moreover, this portable multi gas  detector features several gas entries on the top and on the front in order to properly operate even if the device is inside a pocket or if one of the entries is accidentally covered. As a safety device against potentially dangerous gas concentrations, the X-am 2500 has a 3 years guarentee to ensure maximum security to its user.

The X-am 2500 portable gas monitor  features a large easy to read LCD display. All of the target gases are simultaneously displayed on the screen and once a gas alarm occurs, the hazardous target gas is highlighted for fast recognition of the hazard. The ultra-bright visual alarm can be seen at 360° and is coupled with acoustic 90 dB at 30 cm and vibrating alarms.

An optional gas sampling pump is available to draw remote samples up to 30 meters in order to get sure of gases concentrations in confined spaces like tanks or pits before any intervention. This gas sampling pump, designed for this 4 gas monitor, automatically triggers upon the device start-up and it is very easy for the user to switch from pump mode to diffusion mode without any tool.

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Ultra-compact and lightweight, the X-am 5600 multi gas meter has been especially designed to detect the following gases: O2, Cl2, CO, CO2, H2, H2S, HCN, NH3, NO, NO2, PH3, SO2, amines, odorants, COCl2, ozone and different organic vapors.

  • Drager x am 5600 multi gas meter with electrochemical and infrared gas sensors

Multi gas meter X-am 5600

Ultra-compact and lightweight, the X-am 5600 multi gas meter has been especially designed to detect the following gases: O2, Cl2, CO, CO2, H2, H2S, HCN, NH3, NO, NO2, PH3, SO2, amines, odorants, COCl2, ozone and different organic vapors.

Drager x am 5600 multi gas meter with electrochemical and infrared gas sensors
  • Rugged design with ultra-compact size
  • Infrared gas detection technology
  • Hydrogen detection with electrochemical sensor
  • Opportunity to connect an external sampling pump
  • ATEX approved for use in zone 0
Additional information

The X-am 5600 portable multi gas detector is a personal protective equipment that has been especially designed to simultaneously detect from 1 up to 6 gases. Thanks to an innovative combination of infrared and electrochemical gas detection sensors, this portable gas detector can quickly, reliably and accurately detect the following gases: O2, Cl2, CO, CO2, H2, H2S, HCN, NH3, NO, NO2, PH3, SO2, amines, Odorants, COCl2, Ozone and different organic vapors.

The X-am 5600 has been designed to combine performance and discretion. This way, thanks to a compact size and a light weight, it won’t annoy its user. Easy to wear and to use, this portable multi gas meter is robust and can be used in hostile industrial environments. IP67 certified, it is resistant to water and dust. Moreover, thanks to its rubber housing, this personal gas monitor features an increased resistance to impacts and shocks for use in difficult conditions. As it also features a crocodile clip, it can be easily be attached to a pocket or a collar in order to monitor concentrations inhaled by the operator.

The X-am 5600 multi gas meter can monitor up to 6 gases thanks to electrochemical and infrared sensors. Because of their huge durability and resistance, infrared gas detection sensors can operate for up to 8 years and only require one annual calibration. Thus reducing maintenance and operating costs. This way, this detector can be equipped with an IR Ex sensor to monitor combustible gases (with a measuring range between 0 and 100% of the volume for methane, ethylene and propane for example), an IR CO2 sensor to detect carbon dioxide or an electrochemical sensor for hydrogen detection.

When equipped with an external sampling pump – available in option – the X-am 5600 can draw remote samples up to 30 meters away in order to get hazardous gas concentrations before any intervention. This system is very convenient before any entry in confined spaces like tanks or pits.

Lastly, this lightweight and compact detector is ATEX approved for use in zone 0 - continuous explosive atmosphere.

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The Dräger Xam-EXPLO ATEX combustible gas detector is a portable monitor for explosive gas such as natural gas, butane, propane, hydrocarbons, solvents, alcohols, and some organic vapors. Small, light and with great autonomy, it indicates in real time the lower explosive limit in % LEL.

  • Drager XAM explo combustible gas detector explosimeter

Xam-EXPLO portable combustible gas detector

The Dräger Xam-EXPLO ATEX combustible gas detector is a portable monitor for explosive gas such as natural gas, butane, propane, hydrocarbons, solvents, alcohols, and some organic vapors. Small, light and with great autonomy, it indicates in real time the lower explosive limit in % LEL.

Drager XAM explo combustible gas detector explosimeter
  • Possibility of adding 3 other gas sensors to make a 4 gas detector (EXPLO, O2, CO, H2S)
  • Optional sampling pump for remote sampling (access authorization)
  • Protection against water and dust (IP67)
  • Sensor life of over 4 years
  • 12h autonomy
Additional information

The Dräger combustible gas detector is suitable in many situations. While it is the ultimate tool for firefighters, it is also used in the "oil and gas" sector or in the mining industry.

ATEX zone 0 approved, the Dräger portable combustible gas detector is equipped with an Ex catalytic sensor which has excellent resistance to silicone poisoning and hydrogen sulfide. The sensor has an 4 years lifespan.

The Xam-EXPLO is very light and ergonomic. An external pump can be associated with it, which then makes it possible to detect explosive gases without entering the concerned room.

The Dräger combustible gas detector Xam-EXPLO has a 12 hours autonomy after only a 4 hours charge.

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Fixed combustible gas detectors

Especially designed for use in boiler rooms or parkings, the OLCT10 sensor range is used to monitor presence of explosive vapors and gases or combustion toxic gases in ambient air.

 

  • Fixed gas detector OLCT10

ATEX fixed gas detector – OLCT10

Especially designed for use in boiler rooms or parkings, the OLCT10 sensor range is used to monitor presence of explosive vapors and gases or combustion toxic gases in ambient air.

 

Fixed gas detector OLCT10
  • Detection of the combustible gases, CO, NO, NO2
  • Power supply: 15 to 30 VDC
  • 4-20 mA linear output
  • Robust, user-friendly and easy to install
  • ATEX II 3 G / EEx nA IIC T4 approved
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ATEX gas detector with 4-20 mA linear output, display, 3 relays (alarm 1, alarm 2 and fault) and MODBUS communication. Detection of the combustible gases (IR or catalytic), CO2 (IR) or toxic gases (electrochemical).

  • Fixed gas detector XCD

ATEX Fixed gas detector with display – XCD

ATEX gas detector with 4-20 mA linear output, display, 3 relays (alarm 1, alarm 2 and fault) and MODBUS communication. Detection of the combustible gases (IR or catalytic), CO2 (IR) or toxic gases (electrochemical).

Fixed gas detector XCD
  • Detection of combustible gases, CO, CO2, CH4, H2, H2S, O2
  • Power supply: 15.5 to 32 VDC with 4-20 mA relay output
  • Aluminium or IP 65 stainless steel housing
  • Approval: ATEX II 2G EExd ia d IIC T4
  • Integrated mounting plate with 3 mounting holes – 2 M20 cable gland entries
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Infrared (IR) combustible gas and hydrocarbon detector with 4-20 mA output. ATEX and SIL 2 (EN 50402) approved with many factory configured calibration curbs.

  • Fixed gas detector Optima +

Optima plus combustible gas detector with infrared technology

Infrared (IR) combustible gas and hydrocarbon detector with 4-20 mA output. ATEX and SIL 2 (EN 50402) approved with many factory configured calibration curbs.

Fixed gas detector Optima +
  • Detection of the combustible gases
  • More than 40 specific gas curbs available factory calibrated
  • 4 ray dual source infrared IR technology
  • Very fast response time (T90 < 8 seconds)
  • Very high reliability (MTBF > 28 years)
Additional information

The Optima Plus advanced infrared point gas detector has been especially designed to detect hydrocarbons in potentially explosive certified atmospheres. This fixed gas detector can thus be used in a whole range of applications like offshore drilling platforms, petroleum and gas terminals, refineries, gas turbine-based power plants and so on.

 

Thanks to the integrated infrared gas detection technology, this detector features a very fast response time T50 below 3 seconds and T90 below 4 seconds for methane (CH4) detection. Moreover, the infrared gas detection principle offers a fail-to-safe operation to the detector.

 

As it uses the infrared absorption technology, the Optima Plus is immune to catalytic poisons, can operate in inert atmospheres and features a very long operation life. Moreover, in comparison with classic standard fixed gas detectors, the Optima Plus requires a reduced routine maintenance, which provides low ongoing cost of a gas detection system ownership.

 

In the core of this gas detector, the 4-channel optics block (dual compensated) has been especially engineered to provide the detector with the most stable optics design possible. Its integrated microprocessor controls the signal and offers an optimal safety level and the detector heated optic components reduce risks of condensation. Furthermore, in order to remotely monitor distant or inaccessible sites, the Optima Plus can be integrated into a remote gas sampling system. Its ultra-resistant housing made of stainless steel 316 is IP66 and IP67 approved against dust and water.

 

Lastly, the Optima Plus infrared gas detector features 4-20 mA output signals allowing the device to use the optional HART (Highway Addressable Remote Transducer) protocol. This communication protocol allows among other functions to perform bump tests, simulate alarm, fault or warning, configure alarm thresholds, inhibit, warning and overrange levels and to change target gas.

 

An optional duct mounting kit enables installation of the Optima Plus with a duct/ventilation system. It also enables functional gas testing without removing the detector from the duct system.

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SIL 2 approved ATEX gas detector to detect the combustible gases (IR or catalytic), CO2 (IR), toxic gases (electrochemical), solvents or freons (semiconductor) and asphyxiating gases (oxygen deficiency).

  • Fixed gas detector OLCT100

Fixed gas detector – OLCT100

SIL 2 approved ATEX gas detector to detect the combustible gases (IR or catalytic), CO2 (IR), toxic gases (electrochemical), solvents or freons (semiconductor) and asphyxiating gases (oxygen deficiency).

Fixed gas detector OLCT100
  • Detection of hydrocarbons, solvents, toxic gases, freons, VOC, CO2
  • Housing made of aluminium with epoxy paint (optional 316L Stainless Steel version)
  • Outputs: OLC100: Wheatstone bridge – OLCT100: 4-20 mA linear
  • Power supply: 15.5 to 32 VDC
  • ATEX & SIL 2 approved for catalytic and infrared versions
Additional information

Thanks to the wide variety of sensor technologies that can be used with this monitor, the OLCT100 fixed gas detector can detect a large range of gases. The combustible gases can be detected with a catalytic or infrared sensor, toxic gases with an electrochemical sensor, freons with a semiconductor sensor and carbon dioxide with an infrared sensor.

Two outputs types are available for this fixed gas detector range. The first one is the 4-20 mA analog output. It can be used to detect combustible, toxic and asphyxiating gases but also solvents, freons or carbon dioxide. The second output version is a Wheatstone bridge for the detection of combustible gases (0-100% LEL only).

Many accessories are available for the OLCT100 gas detector to improve sensor response time or to get optimal implementation.

The OLC/OLCT100 range is available under 5 versions:

  • OLC100 : Wheatstone bridge output detector to detect the combustible gases (0-100% LEL only)
  • OLCT 100 XP: Explosion-proof version equipped with a catalytic, electrochemical or semiconductor sensor to detect the combustible or toxic gases or oxygen.
  • OLCT 100 IS: Extremely reliable version to detect toxic gases or oxygen.
  • OLCT 100 XP IR: Explosion-proof version equipped with an infrared sensor to detect the combustible gases or CO2
  • OLCT 100 XP HT: High temperature explosion-proof version to detect combustible gases up to 200 °C
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