Page 8/9 Commissioning
(4) Now switch on the power supply.
(5) Set the 4-mA-point (bottom) and the 20-mA-point (top, container height) on the
level sensor.
(6) Now go to the measurement evaluation unit menu. Select the "Height" item and
enter the container height.
(7) If the 4-mA-point is not at the height of the tank bottom, then set the correct level
in the "Offset" menu.
(8) If the 20-mA-point does not correspond to the container height
− fill your container as full as possible (the 20-mA-point must be above the contain-
er height!),
− then measure the filling height with a dipstick,
− and enter the value in the "Span - Change" menu point.
The 20-mA-point must not be below the container height.
With the device variants UM-O and UM-O Ex (overfill protection devices),
the 20-mA-point must correspond to the container height.
(9) Now you can set the relay switching points.
Changing the offset or the span factor can cause a switching point below 4 mA or
above 20 mA. In that case the relays do not switch as desired and malfunctions
can occur.
Check the current values in the menu items "Relays -> K1…K5 -> S-P On and S-P
Off“ . If the current values are outside of the desired range, "< 4.00 mA“ or ">
20.00 mA“ is displayed under the milliampere unit.
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