Omron E5EK - MANUAL 2 User Manual page 118

CHAPTER 7 CALIBRATION
7.2 Calibrating Thermocouple
' 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 conductor
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 junetion
compensator and the compensating conductor can be substituted with
the cold junction compensator and the compensating conductor for
thermocouple K.
Correct process values cannot be obtained if you touch the contact ends of the com
pensating conductor during calibration of a thermocouple. Accordingly, short
(enable)or open (disable) the tip of the compensating conductor inside the cold junc
tion 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
15 STV
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