Taring function PN6
Suitable taring functions can be selected for various applications. These functions differ
essentially in the method of saving the measured offset value. If no taring is selected,
PN6=0
,
the offset value is always taken to be zero.
With permanent taring,
PN6=1
, the measured offset value in program number
PN5
is
permanently saved in the user settings.
With transient taring,
PN6=2
, the offset value is retained only for the time the display is in
operation. It is lost once the voltage is switched off. Since the integrated permanent memory has
only limited writing capacity, this setting is used for very frequent taring operations (>10x a day)
as with recipe balances. The trigger for the taring must be activated for 1-2 seconds.
With fast transient taring without a message using
PN6=3
, the taring is performed within a
measuring cycle, whereby the offset value is lost when the unit is restarted. This mode is
intended for fully automatic processes in which fast, frequent taring is required via a control
system. The taring signal is filtered only with 50 ms and the taring is carried out without any
message.
With the
PN6=4
setting, the taring is performed on the offset calibration point
PN2
. There is no
shift in the offset value, but the linearisation of the sensor is changed directly. The currently set
measurement for
PN2
is taken over. The trigger must previously be activated for at least 1-2
seconds.
With the static taring,
PN6=5
, the taring operation is performed with an upward slope and held
until the signal is taken away again. After that, the absolute value is displayed. This function is
especially suitable for checking tightness where the pressure loss and final pressure have to be
measured.
Set value for taring PN7
For the display, a target value can be determined for the taring operation. As a rule, it is always
calibrated to zero, i.e. zero is shown in the display following a taring operation. However, this
value can also be changed to any other desired value. If 200 is entered under
PN7
, the offset
value will shift so that, after taring, 200 is displayed. Both of these happen, of course, only on
condition that the display is parameterised to the current measurement
PN15=1
. Where no
trigger is selected for a taring (PN8=0), a taring operation is performed during programming.
Trigger for taring PN8
The taring set in the unit via
PN6
can be triggered via several sources and unit states. If
no
trigger
(
PN8=0
) has been selected, but a taring function has been selected, taring is performed
during programming of the target value
PN7
. If the
digital input
is selected
as a trigger
(
PN8=1
), a taring operation is performed when applying a positive voltage. The same applies to
the
4
th
key
on the display front, which can be selected for taring via
PN8=2 as triggering
. Here
aswell, the period of activation depends on the taring function. Another option is for the
system
start-up
(power-up reset) to
trigger
a taring operation (
PN8=4
). For this of course, there is no
activation period!
23
8. Program number description
