Compur Gas Detector manual Compur Ex plus 1. Application, Measuring Principle

Compur Ex plus

1. Application

The Compur Ex plus is a handy lightweight gasdetector for the measurement of combustibles in ambient air. Standard measuring range is 0 bis 100 % LEL. The instrument is powered by rechargeable batteries. Since the Compur Ex plus has been designed for use in ambient air, it may not be used in an environment with low oxygen concentrations.

Compur Ex plus comes pre-calibrated to the gas to be monitored. Standard components are: Methane, Natural gas, Hydrogene, Propane, Butane, Pentane, Nonane, Methanol und Xylene. The sensor is a plug- in type and can be easily exchanged. The alarm thresholds are user adjustable. Zero- and span-adjustment are easily performed.

Especially for the detection of Methane and Hydrogene an additional charcoal filter is available. This filter will remove substances which might potentially poison the catalytic bead.

2. Measuring Principle

The sensor used in the Compur Ex plus gasdetector is a catalytic bead sensor (pellistor). With this type of element, combustibles between 0 and 100 % LEL can be monitored.

A detector element and a compensation element are mounted in a capsulated body, sealed with metal sinter. The gas to be detected diffuses through the sinter to the detector element consisting of a heated coil coated with catalytic material.

Illustration of measuring principle

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