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Model 9110T NOx Analyzer Principles of Operation
Teledyne Analytical Instruments 350
Note The PMT temperature is maintained by a separate control loop that does
not involve the relay PCA (see Section 13.5.2).
13.3.4.5. Thermocouple Inputs and Configuration Jumper (JP5)
Although the relay PCA supports two thermocouple inputs, the current 9110T analyzers only utilize one.
It is used to sense the temperature of the NO
2
NO converter.
This single thermocouple input is plugged into the TC1 input (J15).
TC2 (J16) is currently not used (see Figure 13-15 for location of J15 and J16).
The type and operating parameters of this thermocouple are set using a jumper plug (JP5).
The default configuration for this thermocouple is:
Type-K
Temperature compensated for Type-K
Isolated
Table 13-5: Thermocouple Configuration Jumper (JP5) Pin-Outs
TC INPUT
JUMPER
PAIR
DESCRIPTION FUNCTION
TC1
1 – 11
Gain Selector
Selects preamp gain factor for J or K TC
OUT = K TC gain factor;
IN = J TC gain factor
2 – 12
Output Scale Selector
Selects preamp gain factor for J or K TC
OUT = 10 mV / °C; IN = 5 mV / °C
3 – 13 Type J Compensation
When present, sets Cold Junction
Compensation for J type Thermocouple
4 – 14
Type K
Compensation
When present, sets Cold Junction
Compensation for K type Thermocouple
5 – 15
Termination
Selector
Selects between Isolated and grounded TC
IN = Isolate TC;
OUT = Grounded TC
TC2
NOT USED
ATTENTION
COULD DAMAGE INSTRUMENT AND VOID WARRANTY
The correct Thermocouple Type must be used if there is ever the need for
replacement. If in doubt please consult Teledyne Customer Service.