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Model 9110T NOx Analyzer Instrument Maintenance
Teledyne Analytical Instruments 246
The maintenance cycle of this item is dependent on ambient moisture, sub-micron particle load and other
factors and may differ from that shown in Table 11-1.
7. Discard the used silica gel desiccant without touching it. It may contain nitric acid,
which is a corrosive and highly irritating substance.
CAUTION – GENERAL SAFETY HAZARD
Immediately wash your hands after contact with the silica gel disiccant.
8. Using a small powder funnel, fill the cartridge with about 10 g new silica gel
desiccant (TAI P/N CH43) so that it is level on both legs of the cartridge.
Slight vibration is required to settle the chemical into the cartridge and achieve
tightest packing, which increases performance and lifetime of the filter.
Ensure that the level of the chemical does not protrude farther than the first two
threads of the NPT fitting.
IMPORTANT
IMPACT ON READINGS OR DATA
Use only genuine, pre-conditioned Teledyne refill kits for this procedure.
Teledyne refill kits have been properly conditioned to prevent a significant
increase of the 9110T’s Auto Zero value which can cause large negative
offsets, which may take 2-3 weeks to disappear.
Do not leave this material uncovered for more than a few seconds, as it
will absorb contaminants from ambient air. Always store unused, well-
covered refill material in a cool dry place.
9. Seal the silica gel desiccant with 1 cm
3
of glass wool on each well.
Ensure that the plug is large enough and compressed into the cartridge so that
the chemical is securely held in place.
10. Add new Teflon tape (P/N HN000036) to the NPT fittings.
11. Screw the NPT fittings back into the scrubber manifold.
12. Screw the cartridge back onto the chassis; orientation is not important.
13. Evaluate the ferrules on the tubing.
If the ferrules are too old, we recommend replacing them with new ferrules.
14. Reconnect the tubing using 7/16” and 9/16” wrenches.
Do not over-tighten the fittings.
15. If the service interval for this item has been exceeded, it may also be necessary to
clean the reaction cell as described in Section 11.3.9.
16. Leak check the system using the pressurized approach described in Section
11.3.12.2.