Thermocouple Sensor
The Thermocouple sensor is a common sensor for temperature readings. This application
note will show operation using the Type K thermocouple.
This sensor outputs a voltage that represents the difference in temperature from the
terminal block to the junction of the wires. Since the voltage is small, typically uV per
degrees Celsius, we will use the differential input to be able to select a smaller scale on
the A/D input, in our example we will - 39mV.
Connect the sensor as follows:
Junction
“DIFF C” input
4 5 6 7
Terminal
Block
Monitor
Description
Thermocouple
Description
4
AGND, wire to DIFF
‘C’ (-)
5
VREF (not used)
6
DIFF ‘C’ (+)
Positive Output
7
DIFF ‘C’ (- )
Negative Output
This MONITOR setup will measure the temperature difference from the sensor in units
of Celsius.
Stage setup
Value
Active
On
Label TDIFF
Meas Type
Analog
Analog Type
Diff C
Input Range
-39 to +39mV
Warmup
1 sec
Averaging Time
00:00:00
Slope 24716
34
