Draeger Polytron IR Ex

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Dräger Polytron IR Ex is a gas detector for continuous monitoring of flammable gases and vapors in ambient air. It offers all benefits of fail-safe IR measurement technology for applications in rough industrial environments. The transmitter converts the gas concentration signal into a 4 to 20 mA analog output. It is designed for one-man calibration and offers a variety of diagnostics and self test features. The configuration and calibration of the transmitter is menue guided and easy to perform, using the built-in key-pad. With the ATEX-approval (device category II 2G acc. to 94/9/EC) and the IEC-approval for world-wide applications the Dräger Polytron IR Ex is suitable for use in potentially explosive atmospheres zone 1 and zone 2.

Features and benefits

Different versions - The transmitter is available in three different versions: Either the standard version with LC display and keypad, or without display and keypad to be connected to a fix installed remote display unit, or with a plug connector to be connected to a hand-held terminal. With this maintenance and calibration can easily be performed even if the transmitter is hard to access.

Comprehensive explosion protection - The Dräger Polytron transmitters IR Ex are certified acc. to the directive 94/9/EC (ATEX 95) and marked by II 2G, indicating that they are suitable to be operated in zones 1 and 2. Also, Dräger Polytron IR Ex is approved acc. to the IEC standard.

Intrinsic Safety - Knowingly Dräger designed the Dräger Polytron IR Ex without implementing the type protection concept of heavy flameproof encapsulation. This means lightweight enclosure and easy installation and maintenance. Parts of the transmitter such as sensor, LC display and keypad – also the remote display unit and hand-held terminal – are intrinsically safe. No additional zener barriers are necessary.

Systems solutions - The shock-resistant enclosure (EEx e) is made of conductive, glass fibre reinforced polyester. Combined with a suitable 4 to 20 mA controller the Dräger Polytron IR Ex transmitters satisfy the customers’ needs for maximum safety and system availability.


Dräger Polytron IR Ex - The transmitter Dräger Polytron IR Ex is a measuring instrument with an optical system which, based on its 2-fold reflected IR-beam and its optimized IR measuring wave length, is very sensitively reacting on hydrocarbon concentrations. Hence for e.g. propane, butane, gasoline vapors, ethers, alcohols, or amines etc. measuring ranges down to 1000 ppm or 5 % LEL full scale value can be adjusted. Also, measuring ranges up to 100 % by vol. for methane are possible.


Dräger Polytron IR Ex IL - The Dräger Polytron IR Ex IL is an in-lineversion for concentration measurement in a gas stream in close-to-process applications. The enclosed stainless steel optical system can directly be connected to a piping system.


Dräger Polytron IR Ex ES - The Dräger Polytron IR Ex ES is a transmitter with an optimized IR measuring wave length especially for the measurement of ethylene, benzene, butadiene, chlorobenzene, styrene, pyridine, and vinyl acetate, etc. These substances are not – or only poorly – detectable by the Dräger Polytron IR Ex.


Dräger Polytron IR Ex HC - Dräger Polytron IR Ex HC is a transmitter with a small optical system including only one reflector. It is very suitable for hydrocarbons which strongly absorb IR around the 3.4 micrometer band, such as gasoline vapors, alcohols, ethers and cyclo-alcanes. However, the measuring range is 0 to 100 % LEL fix.


All Transmitters - The dual wavelength design compensates for changes in light source, optics and environmental conditions. Especially a certain contamination of the reflectors is tolerated without influencing the measuring signal: Without loss of measuring function in case of dirty mirrors a warning signal (“pre-beam-block-warning”) is generated. The reflectors of the sensor are heated just above ambient temperature (not HC version) to prevent condensation due to sudden environmental changes in temperature and humidity.


Measuring function for explosion protection - Concerning measurement performance acc. to the directive 94/9/EC (Annex II, 1.5.5), Dräger Polytron IR Ex and IR Ex IL are approved acc. to the standards EN 50054, EN 50057, EN 50058, and EN 50271 in respect to the following gases and vapors: Methane, propane, acetone, cyclohexane, cyclopentane, dimethyl ether, ethyl acetate, methylethyl ketone, n-pentane, i-propanol, n-octane, toluene, n-butane, n-butyl acetate, ethanol, methanol, methyl-i-butyl ketone, propylene, xylene, i-butane, and 1-butylene.

Technical Data