Siemens 7MB3000 Series Operating Instructions Manual

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Interference gas H2 equivalent values with 10% inference gasSO2 -1.47%Synthetic air 0.40%H2O (3%) 0.38%If you are using accompanying gas concentrations ≠ 10%, you can use the correspondingmultiples of the respective table value as a good approximation. This procedure appliesdepending on the type of gas for an accompanying gas concentration range up to approx.25%.The thermal conductivity of most gas mixtures has a non-linear response. Even ambiguousresults can occur in specific concentration ranges, e.g. with H2 in He mixtures.In addition to the zero offset, the accompanying gas also affect the characteristic curve. Formost gases, however, the effect on the characteristic curve is negligible.More information on correction of cross-interference is available in the following operatingmanuals:• Operating with the Local User Interface Table A-2 References 1 - Operating Manuals LUI(Page 179)• Operation with SIMATIC PDM Table A-3 References 2 - Operating Manuals PDM (Page 179)See alsoReferences (Page 179)9.6 Checking gas paths for leaks9.6.1 General information on leaksThe analyzers may only be used if all the required gas inlet and outlet lines have been connectedprior to startup and tested with an overpressure for leaks and tightness.The device operator is responsible for the required gas inlet and outlet lines.Checking for leaks1. Perform a leak test with air or nitrogen (test gas) at the operating temperature.2. Determine the leak rate in accordance with the pressure drop method. To do this monitor thepressure of the gas (air or nitrogen) enclosed in the gas line for a defined period. The size ofthe pressure drop is a measure of the tightness of the gas line.For the exact procedure, refer to the sections:• OXYMAT 7 (Page 137)• ULTRAMAT 7 (Page 138)• CALOMAT 7 (Page 139)Commissioning9.6 Checking gas paths for leaksWall-mounted deviceOperating Instructions, 07/2023, A5E31930403-AB 133