Hydrocont K
page 8 of 16
Operation elements - adjustment
Adjustment trimmer zero value resp. end value
For adjustment of the measuring range at zero and end value.
For simplifying the procedure a current measuring device can be connected to the terminals 1 and 2 without the
need to disconnect the measuring circuit.
A turn to the right increases the output current. At a turn to the left the output current will be decreased.
Procedure at adjustment:
Set liquid to the minimum filling level and adjust a signal current of 4mA with the zero value trimmer
(zero).
Set liquid to the maximum filling level and adjust a signal current of 20mA with the end value trimmer
(span).
At large measuring range variations it could be necessary to repeat the zero and end value adjustment
one or two times, because the variation of the potentiometer adjustment at zero and end value
produces additionally an influence the respectively other value.
The adjustment range is limited to
Maximum zero value increasement to 25 % of the nominal measuring range
Minimum measuring range 25 % of the nominal measuring range
Adjustment trimmer damping
For adjustment of the damping of the measuring signal.
For neutralization of short pressure blows or also for calming down cyclic fluctuating pressure signals, produced
by mixing machines or also at fill-in.
A turn to the right increases the damping time constant.
At a turn to the left the damping time constant will be decreased.
Without damping the device responses to pressure changes within milliseconds.
At the maximum damping the complete transmission of a pressure change to the output signal can be delayed
by approx. 25 seconds in an exponential function.
- V
s
+V
s
V = 12,5...45V DC
s
Zero
adjustment trimmer
zero value
adjustment trimmer
end value / span
adjustment trimmer
damping
1 2 3 4
