Teledyne 9110TH - Nitrogen Oxides Analyzer - Manual (Page 213)

Instrument Maintenance Model 9110TH NOx Analyzer
Teledyne Analytical Instruments 193
6.4.2. CHANGING THE O
3
DRYER PARTICULATE FILTER
The air for the O
3
generator passes through a Perma Pure © dryer, which is equipped with
a small particulate filter at its inlet. This filter prevents dust from entering the Perma
Pure
© dryer and degrading the dryer’s performance over time. To change the filter
according to the service interval in Table 6-1:
1. Check and write down the average RCEL pressure and the OZONE flow values.
2. Turn off the analyzer, unplug the power cord and remove the cover.
3. Unscrew the nut around the port of the filter using 5/8” and 9/16” wrenches and by
holding the actual fitting body steady with a 7/16” wrench.
Note RISK OF SIGNIFICANT LEAK
Make sure to use proper wrenches and to not turn the fitting against the
Perma Pure
© dryer. This may loosen the inner tubing and cause large
leaks.
4. Take off the old filter element and replace it with a suitable equivalent
(TAPI part# FL-3).
Figure 6-2: Particle Filter on O
3
Supply Air Dryer
5. Holding the fitting steady with a 5/8” wrench, tighten the nut with your hands. If
necessary use a second wrench but do not over-tighten the nut.
6. Replace the cover, plug in the power cord and restart the analyzer.
7. Check the O
3
flow rate, it should be around 250 cm³/min ± 15. Check the RCEL
pressure, it should be the same value as before.