Omron E5EK DEVICENET User Manual page 120

CHAPTER 7 CALIBRATION
7.2 Calibrating Thermocouple
F Preparations
Connecting the
Cold Junction
Compensator
7--4
• Calibrate according to the type of thermocouple, thermocouple group
1 and 2.
Thermocouple group 1
K: -200 to 1300°C, J: -100 to 850°C, L: -100 to 850°C, E, N, W, PLII
Thermocouple group 2
K: 0.0 to 500.0°C, J: 0.0 to 400.0°C, L: 0.0 to 400.0°C, R, S, B, T, U
• When calibrating, do not cover the bottom of the controller. Also, do
not touch the input terminals (Nos.11 and 12) and compensating con-
ductor on the E5EK-DRT.
10
21 22
SOURCE
9
8
7
6
5
4
3
2
23
1
• Set the cold junction compensator to 0_C. However, make sure that
internal thermocouples are disabled (tips are open).
• In the above figure, STV refers to a standard DC current/voltage
source.
• Use the compensating conductor selected thermocouple. However,
note that when thermocouple R, S, E, B, W or PLII is used, the cold
junction compensator and the compensating conductor can be substi-
tuted with the cold junction compensator and the compensating con-
ductor for thermocouple K.
Correct process values cannot be obtained if you touch the contact ends of the
compensating conductor during calibration of a thermocouple. Accordingly, short
(enable) or open (disable) the tip of the compensating conductor inside the cold
junction compensator as shown in the figure below to create a contact or non-
contact state for the cold junction compensator.
Cold junction
compensator
E5EK-DRT
0°C/32°F
controller
Compensating conductor
20
19
18
17
16
STV
15
14
13
Cold junction
12
compensator
11
Compensating
conductor
Short
E5EK-DRT
controller
Compensating conductor
0_C/32_F
Cold junction
compensator
0°C/32°F
Open