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Model 9110T NOx Analyzer Instrument Maintenance
Teledyne Analytical Instruments 250
IMPORTANT
IMPACT ON READINGS OR DATA
This procedure can be carried out while the instrument is running,
however ensure that the analyzer is not in ZERO calibration mode.
1. Locate the scrubber on the outside rear panel; Figure 11-4 shows the exploded
assembly.
2. Remove the old scrubber by disconnecting the 1/4” plastic tubing from the DFU
particle filter using 9/16” and 1/2" wrenches.
3. Remove the DFU particle filter from the cartridge using 9/16” wrenches.
4. Unscrew the top of the scrubber canister and discard the Purafil
©
and charcoal
contents.
Ensure to abide to local laws about discarding these chemicals.
The rebuild kit (listed in Appendix B) comes with a Material and Safety Data
Sheet, which contains more information on these chemicals.
5. It is not necessary to remove the insert from the barrel, but if removed, perform the
following procedure:
Coat the threads of the insert with epoxy (TAI P/N CH32).
Hand tighten insert to barrel.
6. It is not necessary to remove the nylon tube fitting from the insert, but if removed,
apply Teflon tape (TAI P/N HW36) to the threads of the nylon tube fitting before
installing on the insert.
7. Refill the scrubber with charcoal at the bottom and the Purafil© chemical at the top.
Use three, white retainer pads to separate the chemicals as shown Figure 11-4
8. Replace the screw-top cap and tighten the cap; hand-tighten only.
9. If necessary, replace the filter with a new unit and discard the old. See Section
11.3.7.1.
The bottom retainer pad should catch most of the dust, the filter should not be
visibly dirty (on the inside).
10. Replace the scrubber assembly into its clips on the rear panel.
11. Reconnect the plastic tubing to the fitting of the DFU particle filter.
12. Adjust the scrubber cartridge such that it does not protrude above or below the
analyzer in case the instrument is mounted in a rack.
CAUTION!
The following procedures apply only to the External Zero Air Scrubber and NOT
to the inline exhaust scrubber cartridge that is part of the pump pack assembly.