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WAGO-I/O-SYSTEM 750
Commissioning 135
750-489 4AI RTD/TC/Strain Gauge Ex i
Manual
Version 1.1.0, valid from FW Version 02
7.1.2.4 Calibration
The I/O module can be recalibrated to correct the effects of long-term drift or to
optimize accuracy in a thermally stable state. Calibration is dependent on the
signal type previously set for the respective channel (see Section “Channel
Setting”).
Before calibration, please note the following information:
•
Use a low-noise, high-precision calibrator for the calibration.
The accuracy of the calibrator must be higher than that of the device to be
calibrated by a factor of ten.
•
Disconnect all cables (if there are any) from the I/O module to the system.
•
Use a separate 24 V power supply to supply the node.
•
Use short shielded cables to connect to the calibrator.
•
Calibrate each channel separately.
Requirement for “SG - U
ref
” voltage:
To calibrate the “SG - U
ref
: 2.4 V” measurement range, the −E1 and −I1
(Channel 1) or −E3 and −I3 (Channel 3) connections must be connected!
Figure 31: “Calibration” Menu Item (Example Channel 1)