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Ext 0°C Reference
Ext 0°C Reference.
ing as a 0 Volt reference so the voltage reading from the thermocouple can be passed di-
rectly to the tables where the corresponding temperature reading can be found.
Diagram shows passive burnout, for active burnout replace the + for *.
External with a Specified Temperature
Thermocouple
cable
Measuring
junction
External Reference with a specified temperature.
stant known temperature other than 0°C. This temperature can be specified in the setup
menus. This reference temperature is then used in the same way as the reading from the
temperature sensor using the
Diagram shows passive burnout, for active burnout replace the + for *.
43-TV-25-35 GLO Iss.4 Dec 06 UK
A5E01001767-04
Thermocouple CJC Compensation
Thermocouple
Copper wire
cable
°
0
C
Measuring
junction
Reference
junction held
°
at 0
C
By keeping the reference junction at 0 °C then the negative input is act-
Copper wire
°
0 Volts
45
C
Input
terminals
on rear
Reference
panel of
junction held
°
recorder
at 45
C
-
0 Volts
V
+
Input
terminals
on rear
panel of
recorder
-
D
V
+
C
Reading in volts
Thermocouple
Table
Ref
temp
method.
Internal Reference
Look-up table
(converts volt-
(Volts)
age reading to
temperature)
Temperature reading
to maths expression
Inputs
Look-up table
(Volts)
added
(converts
(C+D)
voltage read-
ing to tem-
perature)
Temperature
reading to
maths
expression
The reference junction is kept at a con-
249
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