Preventive Maintenance

Thermal conductivity detector (TCD)

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:

Table 8-2. HP 5890 Radioactivity Leak Test (Wipe Test) Kit

Item

Description

Part No.

Qty

 

 

 

 

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

 

 

 

 

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.

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