Siemens SIPROCESS GA700 Quick Start Manual

Also see for SIPROCESS GA700: Compact operating instructions Quick start Operating instructions Operating instructions Compact operating 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 always use dust-free reference gas as far as possible (particle size < 10 μm).● Always introduce the reference gas before beginning the measurements.● 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.7.3.2 Reference gas from the gas cylinderThe reference gas pressure must be 2 000 hPa above the sample gas pressure for sufficientmeasuring ability.1. Use a reference gas line with the following characteristics at measuring spans of < 2%oxygen:– Small cross-section, e.g. pipe diameter 2 mm– Made of metal, e.g., stainless steel2. Flush the reference gas line thoroughly with reference gas before commissioning.3. Check the reference gas line for leaks to avoid unnecessary losses:– Close the valve at the gas cylinder.– If the pressure display on the pressure reducer does not drop by more than 1 000 hPa/min, the gas connection is sufficiently tight.In the case of two-stage pressure reducers, the inlet pressure must not drop by morethan 1 000 hPa/min.7.3.3 Checking the reference gas flow1. Close the sample gas inlet.2. Lay a hose with an internal diameter of 4 mm from the sample gas outlet into a beaker filledwith water.3. Apply reference gas to the analyzer module.Commissioning: Preparation7.3 OXYMAT 7Quick Start88 Compact Operating Instructions, 05/2015, A5E31805656-03