Description3.6 Combined operationOperating with the Local User Interface34 Operating Manual, 06/2017, A5E31930478-05NoteMode-dependent parameter assignment of the gas path in serial/parallel operationAnalyzer modules can be operated in series or in parallel.• If you are only using one analyzer module or want to operate two analyzer modules inseries, set the value "Shared" in the "Gas path" parameter field.• If you are operating two analyzer modules in parallel, however, select the setting"Separate".You can find the corresponding setting options in the menu → [2.12].3.6.2.2 Operating modes: Serial/parallel operationSerial/parallel operationIf you are using two analyzer modules in a rack-mounted or wall-mounted device, theanalyzer modules can be operated in series or in parallel:● In serial operation, the analyzer modules are connected to the sample gas line in such away that the sample gas flows through the analyzer modules one after the other. For thispurpose, you have to connect the sample gas outlet of the primarily supplied analyzermodule to the sample gas inlet of the second analyzer module operated in series.● In parallel operation, the analyzer modules of the device are connected in such a way thatthe analyzer modules are supplied independently with sample gas.See alsoReferences (Page 281)Pressure operation/Suction operationThe analyzer modules can also be operated in pressure operation and in suction operation:● Pressure operation: For sample gas supply, only the overpressure of the sample gas fromthe gas line or gas cylinder is used.● Suction operation: The sample gas is sucked away by a downstream pump.The mounting position of the sample gas restrictor can be derived from the operating modesselected for the specific application. Supplementary information on avoiding pressure surgescan be found under → "Unstable measured value display (Page 35)".