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Model 400E Ozone Analyzer
Instruction Manual
11.6. Repair Procedures
This section contains procedures that might need to be performed on rare occasions
when a major component of the analyzer requires repair or replacement.
11.6.1. Repairing Sample Flow Control Assembly
The Critical Flow Orifice is part of the Flow Control Assembly located on the sample
pump assembly or optionally in the ozone generator for instruments with the IZS
option. The jewel orifice is protected by a sintered filter, so it is unusual for the
orifice to need replacing, but it is possible for the sintered filter and o-rings to need
replacing. See the Spare Parts list in Appendix B for part numbers and kits.
Procedure:
1. Turn off Power to the analyzer.
2. Locate the assembly attached to the sample pump. See Figure 3-5.
3. Disconnect the pneumatic fittings.
4. Remove the assembly from the sample pump by disconnecting the ¼" tube
fitting on the pump inlet elbow.
5. The inlet end of the assembly is the straight ¼" tube to 1/8" male NPT fitting.
Remove the fitting and the components as shown in the exploded view in Figure
11-1.
6. Replace the o-rings and the sintered filter.
7. If you are replacing the Critical Flow Orifice itself, make sure that the side with
the red colored sapphire jewel is facing downstream to the flow gas flow.
8. Re-assemble in reverse order. See the Spares List in Appendix B for part
numbers.
9. After re-connecting the power and pneumatic lines, verify flow rate is between
720 and 880 cc/min.
P/N 04316 Rev: B
TROUBLESHOOTING & REPAIR PROCEDURES
265
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