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Model 9110T NOx Analyzer Instrument Maintenance
Teledyne Analytical Instruments 247
If necessary, tighten the fittings some more but do not over-tighten.
17. Restart the analyzer and pump and continue operation.
18. Recalibrate the analyzer after one hour (Section 9).
If Auto Zero is high or is changing/not constant, you may have to wait a day until
the silica gel is conditioned before recalibrating the instrument.
11.3.4. MAINTAINING THE EXTERNAL SAMPLE PUMP (PUMP PACK)
11.3.4.1. Rebuilding the Pump
The sample pump head periodically wears out and must be replaced when the RCEL pressure exceeds
10 in-Hg-A (at sea level, adjust this value accordingly for elevated locations).
A pump rebuild kit is available from the factory. Refer to the label on the pump for the part number.
Instructions and diagrams are included in the kit.
A flow and leak check after rebuilding the sample pump is recommended.
A span check and re-calibration after this procedure is necessary as the response of the analyzer
changes with the RCEL pressure.
11.3.4.2. Replacing the Scrubber
CAUTION!
Do NOT attempt to change the contents of the inline exhaust scrubber
cartridge; change the entire cartridge
.
1. Through the SETUP>MORE>DIAG menu turn OFF the OZONE GEN OVERRIDE.
Wait 10 minutes to allow pump to pull room air through scrubber before proceeding
to step 2.
2. Disconnect exhaust line from analyzer.
3. Turn off (unplug) analyzer sample pump.
4. Disconnect tubing from (NOx or charcoal) scrubber cartridge.
5. Remove scrubber from system.
6. Dispose of according to local laws.
7. Install new scrubber into system.
8. Reconnect tubing to scrubber and analyzer.
9. Turn on pump.
10. Through the SETUP menu (per Step 1 above) turn ON the OZONE GEN
OVERRIDE
.
11.3.5. CHANGING THE PUMP DFU FILTER
The exhaust air from the analyzer passes a small particle filter (Dry Filter Unit (DFU - filter), P/N FL3)
before entering the pump. It should be replaced when:
It becomes visibly dirty or;