Preventive Maintenance
Thermal conductivity detector (TCD)
192
Radioactivity leak test (wipe test)
ECDs must be tested for radioactive leakage at least every six 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 ECD. Its contents are listed in
Table 8•2:
Part No.
1 Envelope 05750-80036 4
2 Envelope 05890-90920 4
3 Information Card 18713-90040 12
4 Filter Paper, Circular 3150-0429 12
5 Service Note 5950-3586 1
6 Plastic Bag 9222-0308 12
Item Description Qty
Table 8-2. HP 5890 Radioactivity Leak Test (Wipe Test) Kit
Thermal conductivity detector (TCD)
Cleaning
Cleaning by bake•out of the detector is performed only after verification
that carrier supply gas and flow system components, are leak•and
contaminant•free.
1. Turn off the detector!
DET A
( or
B
)
OFF
2. Remove the column from the detector; cap the detector column fitting.
