Section 7 Calibration
69
b) Tare Measurement via Belt Length
If you know the total belt length (upper and lower belt), you can
run a tare measurement by entering the belt length in meters.
If it is possible to run the conveyor without load for the respective
time, tare measurement can be performed.
At the end of the tare measurement, store the averaged value with
<enter>. If the same count rate is measured again later during
normal operation, the computer knows that the conveyor is empty.
Tare measurement must not exceed 2 hours.
CAUTION! If material is suddenly conveyed during tare
weighing, the result will be falsified. In this case, the tare
measurement has to be started all over again.
Starting the Tare Measurement
Push <run> to start the tare measurement. The tare count rate is
displayed. In addition, if you have selected Time, the remaining
measuring time, if you have selected Length, the remaining belt
length is displayed.
Storing the Tare Count Rate
Push the <enter> button when the measuring time or the belt
length is over to store the tare count rate and the calibration date
(cannot be viewed).
Interrupting the Tare Measurement
The tare measurement can be interrupted and started again any
time by pressing <run> once more.
If a tare measurement has been stopped, the averaged value re-
mains stored and the measurement can be continued any time as
if no interruption had occurred.
However, if you confirm the interruption with <enter>, the tare
count rate is stored together with the calibration date. If you con-
tinue the tare measurement with <run>, the count rate is aver-
aged only over the second part of the measurement; i.e. the stored
mean is not taken into account for the further measurement. This
means: if you quit the tare measurement without pushing <en-
ter>, the mean from the first partial measurement is still valid. If
you quit the tare measurement via <enter>, the mean resulting
from the second partial measurement is stored.
External Start of Tare Measurement
The external tare measurement is started and performed auto-
matically by short-circuiting terminals 20a and 20c and the result
is stored with date. For example, if you start an external tare
measurement during measurement, this measurement will be in-
terrupted and the tare measurement started. After the specified
time has elapsed or the belt length is over, the tare count rate and
the calibration date is stored. Then the system returns to the nor-
mal operating mode.
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