341
Micro-cell Electron Capture Detector (µ-ECD)
Maintaining a µ-ECD detector
It is good practice to monitor the progress of the thermal cleaning by
plotting the µ-ECD signal. Over time, the signal baseline signal should
change as shown in Figure 341-18.
Baseline before cleaning
Figure 341-18
7.
Check the ECD "output" value from the GC display. It should be lower
than the first reading.
Performing a radioactivity leak test (wipe test)
Micro-cell ECDs must be tested for radioactive leakage at least every 6 months.
Records of tests and results must be maintained for possible inspection by
the Nuclear Regulatory Commission and/or responsible state agency. More
frequent tests may be conducted when necessary.
The procedure used is the wipe test. A Wipe Test Kit (part no. 18713-60050)
is supplied with each new µ-ECD. Refer to the information card supplied in
the Wipe Test Kit for instructions on performing the wipe test.
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Start of thermal cleaning
Time
Detectors
Agilent 6890 Gas Chromatograph Service Manual
Baseline after
cleaning
Jun 2001