Teledyne 9110TH - Nitrogen Oxides Analyzer - Manual (Page 307)

Troubleshooting & Repair Model 9110TH NOx Analyzer
Teledyne Analytical Instruments 287
Thermistor(s) – Low Temperature Sensing:
(e.g. Sample Chamber and Reaction
Cell temperatures)
RELAY PCA
DC
Control
Logic
Solid State
AC Relays
Preamplifiers
and Signal
Conditioning
MOTHER BOARD
A/D
Converter
(V/F)
CPU
Themocouple(s)
(High Temperature Sensing;
e.g. Moly and HiCon
Converter temperatures)
AC HEATERS DC HEATERS
THERMOCOUPLE
CONFIGURATION
JUMPER
(JP5)
Cold Junction
Compensation
Figure 8-21: Heater Control Loop Block Diagram.
8.5.7.3. Thermocouple Inputs and Configuration Jumper (JP5)
Although the relay PCA supports two thermocouple inputs, the current 9110TH/M
series analyzers only utilize one. By default, this single thermocouple input is plugged
into the TC1 input (J15). TC2 (J16) is currently not used. See Figure 7-4 for location of
J15 and J16
CAUTION
Avoid damage to the unit: use only the recommended thermocouple type and its specific
settings. If in doubt, call T-API Technical Support for information about the correct part.