The Siemens C79458-L2428-A1 is a TCD (Thermal Conductivity Detector) board used in the Siemens PGC302 process gas chromatograph. It is the dedicated electronic board responsible for processing the signal from the TCD cell, which is the core detector used in gas chromatography to analyze the concentration of gas components.
According to a Siemens PGC302 manual excerpt, the board is explicitly listed under "Detector boards" as the "TCD-board C79458-L2428-A1" . Aftermarket spare parts suppliers describe it as an "electronic board for TCD" or "WLD P302 E-1 electronic board for TCD".
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