KROHNE SU 600 EN User Manual

Page 21

measuring range is shifted slightly. The zero point is

readjusted by carrying out the oﬀset correction in

uncovered (unpressurised) condition. The complete

measuring range will be shifted by the deviating amount.

Make sure that the pressure transmitter is completely

unpressurised, uncovered (unimmersed) and moun-

ted in its ﬁnal position.

Set the function switch to position [ A ]. The display

indicates now the actual sensor current in mA. Save

the current status by pushing the [ +/- ] keys

simultaneously.

For this adjustment procedure, two sensor current

values (4 … 20 mA) must be entered corresponding to

the levels 0 % and 100 %.
When using a pressure transmitter, an oﬀset correction

should be carried out to reach maximum accuracy.

Carry out this oﬀset correction before adjustment and

with the sensor uncovered (unimmersed).

Select now position [D] or [E] on the function switch,

enter the current values in mA for min. or max.

adjustment and save your settings.

During this adjustment procedure, the current level is

assigned to a certain percentage value. For this reason,

percentage values that correspond to the actual ﬁlling

levels must be entered for the min. and max. adjust-

ment. The ideal calibration is at 0 % and 100 %.

Because it is not always possible to empty or ﬁll a vessel

completely, any value can of course be entered. The

greater the diﬀerence between the two adjustment

points, the more precise the measurement. It does not

matter which value is entered ﬁrst.

Select position [B] or [C] on the function switch, enter

the percentage values for the min. and max.

adjustment and save your settings.

Two operating relays are integrated inSU 600 for level

detection. First of all, determine at which switching

points the relays should switch on and oﬀ again.

Adjustment in mA without

changing the level

Adjustment in % by chan-

ging the level

Relay outputs

SU 600 - 4 … 20 mA signal conditioning

Setup with the integrated indicating and adjustment unit

30652

-EN

-050525