Calibrating Thermocouples - Omron E5CN User Manual

Calibrating Thermocouples

1,2,3...
Input type 0, 2, 5, 6, 8
Input type, 1, 3, 4, 7, 9,
10, 11, 12, 13, 14, 15
This example describes how to calibrate the E5CN when thermocouple input
is currently selected on an E5CN supporting thermocouple input.
1. Connect the power supply.
2. Connect a standard DC current/voltage source (STV), precision digital
multimeter (DMM) and contact junction compensator (e.g. zero controller
as in figure) to the thermocouple input terminals, as shown in the figure be-
low.
STV
DMM
Leave open.
Zero
controller
OUTPUT
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, the No.2 display changes to "0". You can
advance to the next step in this procedure even if "0" is not displayed.
5. Press the key to set the E5CN to the state on the left.
The No.2 display at this time displays the currently entered count value en-
tered in Hexadecimal. Set the STV as follows:
• Input types 0, 2, 5, 6, 8 : Set to "54 mV".
• Input types 1, 3, 4, 7, 9, 10, 11, 12, 13, 14, 15: Set to "24 mV".
Allow the count value on the No.2 display to fully stabilize, then press the
key to temporarily register the calibration setup.
−
+
INPUT
Compensating conductor of
currently selected thermocouple
Use K thermocouple
compensating conductor for E, R,
S and B thermocouples and
infrared temperature sensor.
Section 6-3
111