Teledyne 9110TH - Nitrogen Oxides Analyzer - Manual (Page 214)

Model 9110TH NOx Analyzer Instrument Maintenance
Teledyne Analytical Instruments 194
6.4.3. MAINTAINING THE EXTERNAL SAMPLE PUMP
6.4.3.1. 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. The part number of the
pump rebuild kit is located on the label of the pump itself. 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.
6.4.3.2. Changing the Inline Exhaust Scrubber
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.
Note The inline exhaust scrubber is strictly intended for Nitric Acid and NO
2
only.
CAUTION!
Do NOT attempt to change the contents of the inline exhaust scrubber
cartridge; change the entire cartridge.