Teledyne 9110TH - Nitrogen Oxides Analyzer - Manual (Page 216)

Model 9110TH NOx Analyzer Instrument Maintenance
Teledyne Analytical Instruments 196
9. Re-attach the tube fittings to the converter and replace the insulation and cover.
10. Replace the instrument cover and power up the analyzer.
11. Allow the converter to burn-in for 24 hours, then re-calibrate the instrument.
6.4.5. CLEANING THE REACTION CELL
The reaction cell should be cleaned whenever troubleshooting suggests. A dirty reaction
cell will cause excessive noise, drifting zero or span values, low response or a
combination of all. To clean the reaction cell, remove it from the sensor housing: refer
to Section 7.6.5. for an overview of the entire sensor assembly. Use the following guide
to clean the reaction cell:
1. Turn off the instrument power and vacuum pump. Refer to Figure 6-4 for the
following procedure.
2. Disconnect the black 1/4" exhaust tube and the 1/8” sample and ozone air tubes
from the reaction cell. Disconnect the heater/thermistor cable.
3. Remove four screws holding the reaction cell to the PMT housing and lift the cell
and manifold out as shown in the inset of Figure 6-4.