Applies to: Chromatography Smart Plus (GC/MS) Tickets Solved: 2 Rank: 5
The Electron Multiplier (EM) collects the signal from the ionized sample. It is comprised of two parts:
A functional EM can be determined by checking the noise versus the EM voltage. The operational range for an EM is 800-2400 volts. As the EM volts increase so should the noise (threshold and baseline). Thus, if the EM voltage is 2400 and the noise is less than 400 the EM should be replaced. If the EM is 2400 and the noise is 1000, then not enough sample is being sent and the ionizer needs to be replaced.
If an instrument has a high EM voltage and low noise value please contact Technical Support. Alternatively, the instrument may display an error stating, “Electron Multiplier Error”. This error can be the result of several items:
If an operator receives this error they should contact technical support for further assistance.
Our SMEs are standing by to assist with issues and repairs.
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Keywords: signal, EM, noise, detection, "EM error", RF, Electrometer, "electron multiplier", quadrupoles