7. Replace the sintered filter and O-ring. If you were getting the incorrect flow check the orifice
isolated from the instrument. If flow of the isolated orifice is still bad clean or replace orifice. Ideally
the orifice should be cleaned in a sonic bath with lab detergent and water.
8. Ensure the sintered filter, O-ring, orifice and spring go back in the fitting in the correct order.
9. Screw the fitting back into the measurement cell.
10. Replace the Kynar nut.
11. Perform a leak check (refer to Section 6.4.4).
12. Reconnect the vacuum source to the Exhaust Port.
6.4.7 Trim Pot Tuning Procedure
The following must be performed to ensure the Serinus 30 receives an optimal signal after the cell has
been aligned. If this procedure is not performed, the Serinus 30 is likely to produce unstable results. If
the Input Pot reads less than 180 (refer to Section 3.4.15), this is an indication that this procedure
needs to be performed.
Equipment Required
• Pot Adjustment tool
Procedure
1. Open - Main Menu → Service Menu → Diagnostics Menu.
2. Disable - Control Loop → Disabled.
3. Open - Digital Pots Menu.
4. Edit - Input Pot - (Adjust to 200) - Accept.
5. Refer to Figure 140. Adjust the trim pot on the detector assembly such that the Ref. Voltage reads
4.05 V ± 0.05 V.
Figure 140 – Adjust Trim Pot
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