Type / No.
Rev.
Date
Page
Total pages
EW082.695_en
5
02 August 2010
19
28
EsiWelma
s.r.l.
4.7
4…20mA signal calibration mode
To execute this type of calibration, it is necessary to insert in series to the 4...20mA output an
instrument suitable for this magnitude and with a precision of at least 2% on the full scale.
Calibration consists of calibrating two points (one at 4mA, the other at 15 mA)
During the warm-up phase only, enter the monitoring mode and press
9
to enter a menu
where it is possible to directly test the relay outputs, or press
0
to enter the 4…...20mA
output calibration procedure.
The display will show the following:
The two fields XXXX are the A/D Converter values required to generate the output currents.
Press: or to vary the output that generates the 4mA with a delay of about 2
seconds.
Press the key to memorise calibration; the display will show that the new value has been
saved by changing as follows:
Press: or to vary the output that generates the 15mA with a delay of about 2
seconds.
Otherwise, press to terminate the procedure without memorising the new value.
C a l i b . 4 - 2 0 m A : 4 m A
4 = X X X X 1 5 = X X X X
Fig. 4.21
C a l i b . 4 - 2 0 m A : 1 5 m A
4 = X X X X 1 5 = X X X X
Fig. 4.22
