Teledyne 9110E - Nitrogen Oxides Analyzer - Manual (Page 168)

Instrument Maintenance Model 9110E Instruction Manual
154 M9110E Rev B
Figure 9-4: Zero Air Scrubber Assembly
9.3.8. Changing the NO
2
converter
The NO
2
converter is located in the center of the instrument, see Figure 3-2 for location,
and Figure 9-5 for the assembly. The converter is designed for replacement of the cartridge
only, the heater with built-in thermocouple can be reused.
• Turn off the analyzer power, remove the cover and allow the converter to cool.
• Remove the top lid of the converter as well as the top layers of the insulation until
the converter cartridge can be seen.
CAUTION
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.
• Remove the tube fittings from the converter.
• Disconnect the power and the thermocouple of the converter. Unscrew the
grounding clamp of the power leads with a Phillips-head screw driver.