Operation Page 15/16
6.7 Offset Menu (Zero-Point Displacement)
The distance from container bottom up to the 4-mA-point of
the level sensor is called the “Offset".
The distance is set in 1-millimetre steps. The units inches, per-
cent and milliamperes are calculated and displayed for infor-
mation.
Enter with the functions
[+] PLUS and
[–] MINUS
the desired value.
Confirm your entry with RETURN [ ].
Figure 9: "Offset" display
Changing the offset 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“. They must not be below 4 mA and not above 20 mA.
Example:
The container height is set to 3000 mm and the offset is set to 300 mm - which corresponds
to 10%. Since the relay switching points are set in percentage, these points can also be below
10% and therefore less than 4 mA.
With the device variants UM-O and UM-O Ex (overfill protection devices) you
need a password to change the container height.
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