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Model 9110T NOx Analyzer Instrument Maintenance
Teledyne Analytical Instruments 252
11.3.8. CHANGING THE NO
2
CONVERTER
The NO
2
converter is located in the center of the instrument, Figure 3-5 for the location, and Figure 11-5
for the assembly.
The converter is designed for replacement of the cartridge only; the heater with built-in thermocouple is
to be reused.
1. Turn off the analyzer power.
2. Remove the instrument cover and allow the converter to cool.
3. Remove the converter assembly cover as well as the Moly insulation (top layer and
corner cut out layers) until the Moly converter assembly can be seen.
CAUTION
HOT SURFACE HAZARD
The converter operates at 315º C. Severe burns can result if the assembly is not
allowed to cool.
Do not handle the assembly until it is at room temperature. This may take several
hours
4. Remove the tube fittings from the Moly converter assembly.
5. Disconnect the power and the thermocouple from the Moly converter assembly.
6. Unscrew the steel cable clamp (for the power leads) from the converter housing
with a Phillips-head screw driver.
7. Remove the Moly converter assembly (converter cartridge and band heater) from
the converter housing.
Make a note of the orientation of the tubes relative to the heater cartridge.
8. Unscrew the band heater and loosen it.
9. Remove the old converter cartridge.
CAUTION!
Wear gloves prior to changing the NO
2
Converter to ensure that the fiberglass
insulation does not come into contact with your skin.