Teledyne 9110TH - Nitrogen Oxides Analyzer - Manual (Page 217)

Instrument Maintenance Model 9110TH NOx Analyzer
Teledyne Analytical Instruments 197
Figure 6-4: Reaction Cell Assembly
4. The reaction cell will separate into two halves, the stainless steel manifold assembly
and the black plastic reaction cell with window, stainless steel cylinder and O-rings.
5. The reaction cell (both plastic part and stainless steel cylinder) and optical glass
filter should be cleaned with methanol and a clean tissue and dried thereafter.
6. Usually it is not necessary to clean the ozone flow orifice since it is protected by a
sintered filter. If tests show that cleaning is necessary, refer to Section 6.4.6 on
how to perform maintenance on 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 be cleaned in an ultrasonic bath.
8. Reassemble in proper order and re-attach the reaction cell to the sensor housing.
Reconnect pneumatics and heater connections, then re-attach the pneumatic
sensor assembly and the cleaning procedure is complete.
9. After cleaning the reaction cell, it is also recommended to exchange the ozone
supply air filter chemical.