Commissioning: Preparation7.3 OXYMAT 7Quick Start82 Compact Operating Instructions, 06/2017, A5E31805656-05● Make sure that the sample gas does not condense in the gas preparation unit and in theanalyzer itself. Appropriate measures include heated sample gas lines, a heatedanalyzer, or a compressor cooler.● You can install the following devices upstream of the sample gas inlet for gas preparation:– A gas sampling device– A sample gas cooler– A filter– A gas suction pumpDepending on the composition of the sample gas, you may need additional equipment suchas a wash bottle, additional filters and pressure reducers.Ensure that gas sampling devices, gas cooling devices, condensate vessels, filters and anyconnected controllers, recorders or indicators are ready to operate (see the associatedoperating instructions).7.3 OXYMAT 77.3.1 Introduction of reference gasNoteComposition of the reference gasUsing an unsuitable reference gas can cause the reference gas throttle (capillary tube) to beclosed. The device is then no longer capable of measuring.Therefore, use dust-free reference gas or a standard dust filter with a mean pore width of<5 μm in the reference gas inlet.● Always introduce the reference gas before introducing the sample gas.● In the case of temporary interruption of the measurements, reference gas should alsoalways flow. This prevents the sample gas remaining in the measuring chamber fromdiffusing to the microflow sensors and possibly destroying them.