Calibrating Thermocouple - Omron E5CK User Manual

CHAPTER 4 APPLIED OPERATION
F Calibration item
menu
Calibration item
parameter
Process value
F Calibration save
mark
calibration save mark
J Calibrating ther-
mocouple
F Preparations
Connecting the
Cold Junction Con-
ductor
4--12
Parameters are displayed on the No.1 display, and the process value is
displayed in Hexadecimal on the No.2 display.
Normally, the process value changes by several digits. The process value
flashes, for example, when a sensor error causes the process value to
stray from the calibration target range.
When the process value display is flashing, the process value is not saved
as data even if the
Once the E5CK controller has been calibrated by the user, [
ceded by the "." mark when the calibration mode is selected.
Calibrate according to the type of thermocouple, thermocouple 1 group
(K1, J1, L1, E, N, W, PLII) and thermocouple 2 group (K2, J2, L2, R, S,
B, T, U).
When calibrating, do not cover the bottom or top of the controller. Also,
do not touch the input terminals (Nos. 6 and 7) and compensating con-
ductor on the E5CK controller.
AC100-240V
(AC/DC24V )
5
SOURCE
4
3
2
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,
and DMM refers to a precision digital multimeter.
Use a compensating conductor selected thermocouple. However, note
that when thermocouple R, S, E, B, W or PLII is used, the compensating
conductor can be substituted with the cold junction compensator for
thermocouple K and compensating conductor.
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.
E5CK
controller
Compensating conductor
key is pressed.
10
11 12
9
8
7
13 14
6
Compensating
DMM conductor
Cold junction
compensator
Short
0°C/32°F
STV
Cold junction
compensator
0°C/32°F
Cold junction
compensator
E5CK
0°C/32°F
controller
Compensating conductor
] is pre-
Open