Packed Column; Capillary Column - HP 5890 Series II Plus Reference Manual

Preventive Maintenance
Electron capture detector (ECD)

Packed column:

1. Close the anode purge on/off valve.
2. Remove the column from the detector; install in its place an empty
glass column.
3. Establish normal carrier gas flow rate (20 to 30 ml/min); set oven
temperature to 250 C.
4. Open the anode purge on/off valve.
5. Heat the ECD to 350 C. Allow thermal cleaning to continue for 3 to
12 hours. If the displayed value does not drop below 60 (600Hz),
indicating a high background signal, it is recommended that the
detector be returned to Hewlett-Packard for cleaning.

Capillary column:

1. Close the makeup gas and anode purge on/off valve.
2. Remove the column from the makeup gas detector.
3. Install a paper clip or similar gauge wire in the same manner as a
capillary column.
4. Open the makeup gas on/off valve and establish a makeup gas flow
rate of 50 to 60 ml/min.
5. Open the anode purge on/off valve.
6. Set the oven temperature to 250 C.
7. Heat the ECD to 350 C. Allow thermal cleaning to continue for 3 to
12 hours. If the displayed value does not drop below 60 (600Hz),
indicating a high background signal, it is recommended that the
detector be returned to Hewlett•Packardfor cleaning.
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