CHAPTER 7 CALIBRATION
E5CK
7–4
7.2 Calibrating Thermocouples
Ă• Calibrate according to the type of thermocouple, thermocouple 1 group
(K1, J1, L1, E, N, W, PLII) and thermocouple 2 group (K2, K2, L2, R, S,
B, T, U).
Ă• When calibrating, do not cover the bottom of the controller. Also, do not
touch the input terminals (Nos.6 and 7) or compensating conductor on
the E5CKĆT controller.
F Preparations
5
4
3
2
1
1211
DMM
STV
Cold junction
compensator
0C/32F
Compensating
conductor
10
9
8
7
6
1413
AC100-240V
(AC/DC24V )
~
SOURCE
Ă• Set the cold junction compensator designed for compensation of interĆ
nal thrmocuples to 0C. However, make sure that internal thermocouĆ
ples are disabled (tips are open).
Ă• In the above figure, STV refers to a standard DC current/voltage source,
and DMM refers to a precision digital multimeter.
However, note that DMM is required only when the transfer output
function is supported.
Ă• Use the compensating conductor on the selected thermocouple. HowevĆ
er, note that when thermocouple R, S, E, B, W and PLII is used, the cold
junction compensator and the compensating conductor can be substiĆ
tuted with the cold junction compensator and the compensating conducĆ
tor for thermocouple K.
Correct process values cannot be obtained if you touch the contact ends of the comĆ
pensating conductor during calibration of a thermocouple. Accordingly, short (enĆ
able) or open (disable) the tip of the thermocouple inside the cold junction compenĆ
sator as shown in the figure below to create a contact or nonĆcontact state for the
cold junction compensator.
Connecting the
Cold Junction
Compensator
0°C/32°F0°C/32°F
Cold junction
compensator
Cold junction
compensator
E5CK-T E5CK-T
Compensating conductor Compensating conductor
Short
Open
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