Teledyne 9110AH - Nitrogen oxides analyzer - Manual (Page 106)

TELEDYNE Model 9110AH NO
X
Analyzer Operator Manual, 01620, Rev. F
8-4
8.3 Replacing the Converter
The Converter is located in the center of the instrument, refer to Figure 2-5 for its location. The
heater, thermocouple, ozone scrubber and converter are designed to be replaced as a single
unit.
1. Turn off the power to the M9110AH and allow the converter to cool.
2. Remove the entire assembly from the chassis:
CAUTION
The converter operates at about 700 C. Severe burns can result if
not enough time is allowed for the assembly to cool. Do not
handle assembly until it is at room temperature.
A. Remove the pneumatic fittings from the valves.
B. Remove the Molex connectors to the valve bracket, thermocouple wire and cartridge
heater.
C. Remove the converter assembly from the chassis by loosening the 4 captive screws that
secure the assembly to the chassis.
3. Disconnect the gas fittings and power cable grounding from the can.
4. Remove the valve assembly and bottom bracket and re-attach those two parts to the
replacement converter assembly.
5. Re-attach the pneumatic fittings and valve assembly to the can.
6. Install the assembly back into the analyzer. Re-attach the electrical and pneumatic fittings.
Leak check the assembly when completed.
7. Turn the power back on. The insulation can emit a burnt odor for the first 24 hours, this is
normal. Allow the converter to burn-in for 24 hours, then re-calibrate the instrument.