Omron E5GC User Manual

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7 User Calibration
E5@C Digital Temperature Controllers User’s Manual (H174)
7-3 Thermocouple Calibration
7
Additional Information
Connecting the Cold Junction Compensator
Correct process values cannot be obtained if you touch the contact ends of the compensating
conductor during calibration of a thermocouple. Accordingly, short-circuit (enable) or open
(disable) the tip of the thermocouple inside the cold junction compensator as shown in the figure
below to create a contact or non-contact state for the cold junction compensator.
In this example, calibration is shown for a Digital Controller with thermocouple/infrared temperature
sensor set as the input type.
1. Connect the power supply.
2. Connect a standard DC current/voltage source (STV), precision digital multimeter
(DMM), and contact junction compensator (e.g., a zero controller as in the figure)
to the thermocouple input terminals, as shown in the figure below. When you
calibrate the E5@C-B or E5GC, connect STV and DMM through the terminal
block.
3. Turn the power ON.
4. Move to the Calibration Level.
This starts the 30-minute aging timer. This timer provides an approximate timer for
aging. After 30 minutes have elapsed, the No. 2 display changes to 0. You can
advance to the next step in this procedure even if 0 is not displayed.
• Input types 5, 7, 11, 12,
15, 19, 20:
• Input types 6, 8, 9, 10, 13,
14, 16, 17, 18, 21, 22, 23,
24:
5. When the M Key is pressed, the status changes as shown to the left.
The No. 2 display at this time shows the currently entered count value in
hexadecimal. Set the STV as follows:
• Input types 5, 7, 11, 12, 15, 19, 20: Set to 54 mV.
• Input types 6, 8, 9, 10, 13, 14, 16, 17, 18, 21, 22, 23, 24: Set to 24 mV.
Allow the count value on the No. 2 display to fully stabilize, then press the D Key
to temporarily register the calibration settings.
If this count value is outside of the specified range, the No. 2 display will flash and
the count value will not be temporarily registered.
E5@C
0°C/32°F
0°C/32°F
Compensating conductor
Compensating conductor
Cold junction compensator
Cold junction compensator
Short-circuit
Open
E5@C
STV
DMM
Zero controller
−
+
OUTPUT INPUT
STV
DMM
Zero controller
−
+
OUTPUT INPUT
Leave open.
Leave open.
Relay terminal block
E5CC, E5CC-U, E5EC, E5AC, or E5DC
E5@C-B or E5GC
Compensating conductor of currently selected
thermocouple
Use K thermocouple compensating conductor for E, R,
S, B, W, and PLII thermocouples and for an infrared
temperature sensor.
adj
30
t 54
69as
t 24
e220

Omron E5GC Specifications

General

Brand	Omron
Model	E5GC
Category	Temperature Controller
Language	English