Teledyne 9110EH - Nitrogen Oxides Analyzer - Manual (Page 169)

Model 9110EH Instruction Manual Instrument Maintenance
• Remove the converter assembly (cartridge and band heater) from the can. Make a
note of the orientation of the tubes relative to the heater cartridge.
• Unscrew the band heater and loosen it, take out the old converter cartridge.
Figure 9-5: NO
2
Converter Assembly
• Wrap the band heater around the new replacement cartridge and tighten the screws
using a high-temperature anti-seize agent such as copper paste. Make sure to use
proper alignment of the heater with respect to the converter tubes.
• Replace the converter assembly, route the cables through the holes in the can and
reconnect them properly. Reconnect the grounding clamp around the heater leads
for safe operation.
• Re-attach the tube fittings to the converter and replace the insulation and cover.
• Replace the instrument cover and power up the analyzer.
• Allow the converter to burn-in for 24 hours, then re-calibrate the instrument.
9.3.9. 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, it is necessary to remove it from the sensor housing. refer to
Section 11.6.6. for an overview of the entire sensor assembly. Use the following guide to
clean the reaction cell:
• Turn off the instrument power and vacuum pump. Refer to the Figure 9-6for the
following procedure.
M9110EH Rev 0 155