Press Force Sensor
Type 9323AA, 9323A, 9333A, 9343A, 9363A, 9383A, 9393A
Page 44 9323A_002-476e-11.24
7. Calibration and maintenance
The Press Force Sensors Type 9323AAA ... 9393A are
reliable instruments, which require practically no
maintenance. Please study the following two sections in
order to maintain long and reliable operation.
7.1 In-situ calibration of force sensors
Absolute measurement results can only be made if the
complete measurement assembly, e.g. the press force
sensor and its mounting fixtures, has been calibrated.
If it is possible to remove the force measurement assembly,
without influencing the pretension and load distributing of
the force sensor, the assembly can be sent to a Kistler
Calibration Centre for recalibration. If, however, the sensor
is integrated into the machine structure, it normally is not
possible to remove the force measurement assembly for
recalibration. In this case an in-situ calibration must be
performed.
7.1.1 Working point calibration by peak value comparison
The test system is calibrated by comparing its output with
that of a reference measurement chain at loads around a
specific working point. An average sensitivity is calculated
from the peak values of both the reference and test
systems recorded over multiple load cycles.
It is important to note the calculated sensitivity, S*, is valid
for a specific measurement chain, i.e. sensor, charge
amplifier and display unit. Exchanging sensors or amplifiers
will make the calibration invalid.
Furthermore, the sensitivity S* is calculated around a
specific working point and will invariably differ slightly
from any works calibration results, which would have been
derived using a standard continuous calibration procedure.
It is generally also recommended to check the distribution
of the average sensitivity by calculating the standard
deviation of the sensitivity S*.
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