341 Micro-cell Electron Capture Detector (µ-ECD)
Theory of operation
2 of 26
Jun 2001
Detectors
Agilent 6890 Gas Chromatograph Service Manual
EPC detector
The EPC version of the µ-ECD detector has one flow line for the anode purge/
makeup gas. After an initial filter frit, the line has a proportional valve
controlled by a pressure sensor. The line splits into two paths, each containing
a non-adjustable restrictor frit. The makeup gas line sweeps past the end of
the column and carries the column effluent into the ECD micro-cell. The
anode purge flow sweeps the upper part of the µ-ECD and cleans sample
deposition from the detector.
Figure 341-2 EPC µ-ECD flow diagram
Capillary
adapter
Column
Makeup gas
restrictor
Anode gas
Pressure
control
loop
Filter
frit
PS
Proportional
valve
Pressure
sensor
restrictor
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