5.41
4. Push the top insert (3) up to the stop while holding the bottom insert (4) down.
5. Tilt the tube forwards until the lower end it clear of the bottom insert (4) and with draw
tube.
6. Inserts (3) and (4) can now be lifted out.
7. Clean the tubes by washing them thoroughly with a volatile solvent or with soap and
water.
8. Dry the cleaned tubes thoroughly using instrument quality air.
9. Replace ‘O’ rings as necessary. A complete set are in kit part no. 01161999 (Viton)
10. Replacing the ‘O’ rings should be carried out carefully ensuring that no surfaces are
damaged. Moisten the ‘O’ rings or use a small amount of suitable grease, e.g. Voltalef,
which is suitable for oxygen service.
11. Reassembly is the reverse of this process, using the plastic wedge (2) now as a sliding
wedge.
12. Ensure the sample system is leak tight. See Section 5.3.4.
5.4.1.2 Needle Valve Overhaul
1. Turn off gas supply to analyser.
2. Unscrew and remove valve body assembly.
3. Replace ‘O’ rings as necessary. A complete set are in kit part no. 01161999 (Viton) or
01161998 (EPDM).
4. Replacing the ‘O’ rings should be carried out carefully ensuring that no surfaces are
damaged. Moisten the ‘O’ rings or use a small amount of suitable grease, e.g. Voltalef,
which is suitable for oxygen service.
5. Reassembly is the reverse of the removal process.
6. Ensure the sample system is leak tight. See Section 5.3.4.
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