Cleaning The Reaction Cell - Teledyne 9110AH Instruction Manual

TELEDYNE Model 9110AH NO

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 and window will cause excessive noise, unstable span or zero, 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 & 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. Push the reaction sleeve and window gently out of the reaction cell. Clean the assembly
with any of the following:
A. Ammonia free glass cleaner.
B. Baking soda (sodium bicarbonate) and water solution.
C. Simple Green 10:1 dilution.
Rinse with distilled or de-ionized water, wipe with a clean tissue, and dry. It is normally not
necessary to clean the ozone flow or sample flow orifices because they are protected by fritted
filters. However, the following procedure is included here for completeness.
8. The manifold assembly should be cleaned by removing the o-ringed fittings, springs, fritted
filter, orifices and O-rings from the ozone inlet. (NOTE: That the sample inlet does not
contain a sample flow control orifice. The sample flow control orifice is located in a heated
block at the rear of the instrument.) 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 in either solvent by an ultrasonic bath for 30
minutes. Replace o-rings.
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.
Analyzer Operator Manual, 01620, Rev. F
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