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Instrument Maintenance Teledyne API - Model 200EH/EM Operation Manual
180
9.3.3. MAINTAINING THE EXTERNAL SAMPLE PUMP
9.3.3.1. 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. Appendix B of this manual lists the part numbers of the pump rebuild kit. 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.
9.3.3.2. 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 NO2 only.
9.3.4. CHANGING THE PUMP AND IZS DUST FILTERS
The exhaust air from the analyzer passes a small particle filter (DFU filter, part # FL3) before entering the pump.
When this particle filter becomes visibly dirty or the pressure drop between SAMP and RCEL pressure
increases significantly, it needs replacement in order to prevent a large pressure drop with degraded analyzer
performance.
CAUTION!
Do NOT attempt to change the contents of the inline exhaust scrubber cartridge; change the entire cartridge.
04521C (DCN5731)