80
•
Do not touch input terminals 3 or 4 or compensating conductor during calibra-
tion.
Preparation
•
Connect an STV (standard voltage/current generator) to input terminals 3 and
4.
•
Prepare a cold junction compensator with a built-in thermocouple that is the
same type as the calibrating thermocouple, and set the compensator to 0
°
C
with the built-in thermocouple disabled (i.e., the terminals left open).
Compensating
conductors
Cold junction
compensator
0
°
C/32
°
F
100 to 240 VAC
12 to 24 VDC
Note Connection of Cold Junction Compensator
The thermocouple cannot be calibrated correctly if the connecting points of the
compensating conductors come into contact with the human body. Therefore,
be sure to enable the built-in thermocouple by short-circuiting the thermocouple
or disable the thermocouple by keeping the thermocouple terminals open to
connect or disconnect the cold junction compensator as shown in the following
illustration.
Cold junction compensator
Compensating conductor
Short-cir-
cuiting
Open
Cold junction compensator
Compensating conductor
K3NH
K3NH
Thermocouple Group 1 Calibration
1, 2, 3...
1. First, the
sUre
alarm display will appear. This will not appear once field cal-
ibration is performed.
Set Value LED Display Model
Basic Model
2. Press the Mode Key to display
1ts0
. The teaching indicator will be lit. Then
calibrate the main input.
Set Value LED Display Model
Basic Model
3. Press the RESET/TEACH Key to display the calibration value setting. Then
set the output of the STV to 50 mV. The teaching indicator will flash. After the
Maintenance Mode
Section 5-3
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