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Teledyne API Model 200AU NO
X
Analyzer Instruction Manual, 02293, Rev. F
8-7
8.4 Cleaning the Reaction Cell
The reaction cell should be cleaned whenever troubleshooting points to it as the cause of the
trouble. A dirty cell will cause excessive noise, unstable zero or span, or low response.
To clean the reaction cell it is necessary to remove the reaction cell from the sensor housing. Use
the following guide:
1. Turn off the instrument power and vacuum pump.
2. Loosen the hold down screws for pneumatic sensor assembly and move the assembly to
the side.
3. Disconnect the exhaust fitting and inlet fittings. See Figure 8-3.
4. Loosen four screws holding the reaction cell to the sensor.
5. Disconnect heater/thermistor and lift the cell away.
6. The reaction cell will separate into two halves:
A. The manifold assembly
B. The reaction block with reaction sleeve and window
7. The reaction sleeve and window should be cleaned with methanol and a clean tissue and
dried.
8. Normally it is not necessary to clean the sample and ozone flow orifices since they are
protected by sintered SS filters. If tests shows that cleaning is necessary then do the
following:
A. The manifold O-rings, springs, sintered SS filters, and orifices should be removed
before cleaning. It is suggested that the orifice, filter and o-rings be replaced
unless an ultrasonic cleaner and methanol or methylene chloride is available. Both
orifice and sintered filter may be cleaned with an ultrasonic bath for 30 minutes in
either solvent.
B. After cleaning with solvent, flush copiously with tap waster.
C. Now, rinse parts in either D1 or distilled water.
D. Dry parts prior to re-installation.
9. Do not remove the sample and ozone nozzles. They are Teflon threaded and require a
special tool for re-assembly. If necessary, the manifold with nozzles attached can be
cleaned in an ultrasonic bath.
10. Reassemble in proper order and re-attach onto sensor housing. Reconnect pneumatics and
heater connections, then re-attach the pneumatic sensor assembly and the cleaning
procedure is complete.
11. After cleaning, the analyzer span response may drop 10 - 12% in the first 1-2 days as the
reaction cell window conditions.