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Thermocouple CJC Compensation
The different methods for connecting thermocouples according to the type of reference are
shown below.
Internal Automatic
Internal Auto
at this junction is being measured by a temperature sensor on the rear panel of the recorder.
The reading from this sensor is read off against a value taken from the thermocouple table,
which corresponds to the type of thermocouple being used. The corresponding reading in
volts for the temperature measured by the sensor is then used as a reference for the reading
from the thermocouple.
Diagram shows passive burnout, for active burnout replace the + for *.
248
Thermocouple CJC Compensation
Input terminals
on rear panel of
recorder
Measuring
junction
-
+
Thermocouple
cable
. This is connected to the input terminals of the recorder, and the temperature
Inputs
D
added
V
(C+D)
C
CJC Reading
in volts
A
Thermocouple
Table
Reading
°
in
C
Look-up table
(Volts)
(converts
voltage read-
ing to tem-
perature)
Temperature
reading to
maths
expression
43-TV-25-35 GLO Iss.4 Dec 06 UK
A5E01001767-04
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