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Cold-Junction Sensor
Note
NI-DAQ includes thermistor conversion utilities that implement the equations listed
below. Refer to your software documentation for more information on these utilities.
V
Note
TEMPOUT
the maximum gain for this range on the analog input channel.
© National Instruments Corporation
The cold-junction sensor voltage output varies from 1.91 to 0.58 V over a
0 to 55 °C temperature range.
You can use the following formulas to convert the cold-junction sensor
voltage to cold-junction temperature:
where T
is the temperature in kelvin.
K
T
where
a = 1.295361 × 10
b = 2.343159 × 10
c = 1.018703 × 10
R
is the resistance of the thermistor in ohms.
T
R
where V
is the output voltage of the cold-junction sensor.
TEMPOUT
where T(°F) and T(°C) are the temperature readings in degrees Fahrenheit
and Celsius, respectively.
varies from 1.91 V (at 0 °C) to 0.58 V (at 55 °C). For best resolution, use
For the cold-junction sensor measurement accuracy, refer to the
Specifications
section.
For more information about how to configure the SCC-TC using
NI-DAQmx, refer to the SCC Quick Start Guide.
T °C
(
)
T
273.15
=
–
K
1
=
------------------------------------------------------------- -
K
[
(
)
a
b
ln
R
c
+
+
T
–3
–4
–7
V
TEMPOUT
,
5 000
------------------------------------- -
=
T
2.5 V
–
TEMPOUT
[
T °C
(
) ]9
T °F
(
)
=
----------------------- -
5
9
SCC-TC Series Thermocouple Input Modules User Guide
3
(
)
]
ln
R
T
32
+
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