Cold-Junction Sensor; Open Thermocouple Detection; Power Requirement - National Instruments SCC-TC Series User Manual

Thermocouple
Type
K
N
R
S
T

Cold-Junction Sensor

Note The accuracy specification includes the combined effects of the temperature sensor
accuracy and the temperature difference between the temperature sensor and any
thermocouple connector. The temperature sensor accuracy includes component tolerances,
temperature drifts, and self-heating effects. It does not include measurement device errors.

Open Thermocouple Detection

Power Requirement

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Temperature
Range (°C)
–200 to –100
–100 to 600
600 to 1,200
–200 to –100
–100 to 1,300
–50 to 0
0 to 100
100 to1,600
–50 to 0
0 to 1,400
1,400 to 1,600
–200 to –100
–100 to 400
Cold-junction sensor accuracy ............... ±0.4 °C max from 15 to 35 °C,
Output..................................................... 1.91 V (0 °C) to 0.58 V (55 °C)
Pull-up resistor ....................................... 10 MΩ
Bias resistor............................................ 10 MΩ
Maximum field wire gauge .................... 16 AWG
Analog power ......................................... 60 mW max
+15 V .............................................. 2 mA max
–15 V............................................... 2 mA max
Digital power (+5 V).............................. 0.0 mW
Maximum
Inaccuracy (±°C)
2.5
1.25
2
2.5
2
3
2
1.75
3
2
2.5
2.5
1
±0.75 °C max from 0 to 15 °C
and 35 to 55 °C
15 SCC-TC Series Thermocouple Input Modules User Guide
Typical
Inaccuracy (±°C)
1.25
0.67
0.45
2
0.7
1.24
0.82
0.4
1.3
1
1
2
0.9