Model 100E Instruction Manual Instrument Maintenance
045150102 Rev XB1 161
• Adjust the scrubber cartridge such that it does not protrude above or below the
analyzer in case the instrument is mounted in a rack. If necessary, squeeze the
clips for a tighter grip on the cartridge.
9.3.4. Cleaning the Sample chamber
The sample chamber should be cleaned whenever troubleshooting suggests. A dirty
sample chamber will cause excessive noise, drifting zero or span values or low response.
To clean the sample chamber, it is necessary to remove it from the sensor housing. Use
the following guide:
1. Turn off the instrument power and vacuum pump.
2. Disconnect the black 1/4" exhaust tube and the 1/8” sample and ozone air tubes
from the sample chamber. Disconnect the heater/thermistor cable.
3. Remove four screws holding the sample chamber to the PMT housing and lift the
cell and manifold out.
4. The sample chamber will separate into two halves, the stainless steel manifold
assembly and the black plastic sample chamber with window, stainless steel
cylinder and O-rings.
5. The sample chamber (both plastic part and stainless steel cylinder) and glass
window should be cleaned with methanol and a clean tissue and dried thereafter.
6. Usually it is not necessary to clean the sample and ozone flow orifices since they
are protected by sintered filters. If tests show that cleaning is necessary, refer to
section 9.3.5. below on how to clean the critical flow orifice.
7. Do not remove the sample and ozone nozzles. They are Teflon threaded and
require a special tool for reassembly. If necessary, the manifold with nozzles
attached can b cleaned in an ultrasonic bath.
8. 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.
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