19
10.4 Fu
This torqu
monitoring
ransduce
nctio
Measuring Instrument
e mon
Piezo
s in a
iezo-electric effectual dielectric materials are
tals, the centre of
ads. The piezo
erials are deformed, the
ipole
of those polarization changes, loads are being set
ric effect can be used to obtain the load
the deformation. The freed load depends
only on the deformation of the crystal and not on the speed or on the acceleration of the
/ MS25 / MS10) have piezo-quartz
preloading of the cell during manufacturing,
is determined. Since different cell sizes are
oads of the transducers are different.
b)
ton - Meter (N·m). That means if a force of 1 N·m is put to the measuring cell, a
ad is emitted, which is defined by the calibration value.
/ N·m
Pico Coulomb = 0.000 000 000 001 C
The me
le
arge
ed
transforms the
emitted electrical load from
depends on the integrated capacitor, which is
t, i.e. at a range
capacitor of 1000 pC, a load of 2000 pC is converted into 2 V. Each measuring range is
rated to
V.
10.4.3
(Piez
suring Transd
A characteristic of the charge amplifier is the drift. This drift is caused by the input-
resista
the in
nsistor. Throu
voltag
ge amplifier drifts
ion. Therefore, it is import
e measurement
mediately prior to the screw driving.
MS-Br
cal re
ma
he deformed D
of its basic resistance R (no load) and the
onsequential occurring resistance-change
∆
R.
nality of the
itor has been designed and constructed for the sole purpose of
-Transducers-, Strain Gauge Transducers or external Rotary Type
n industrial environment.
r
T
10.4.1 Piezo Electric Effect
The positive and negative loads of the p
distributed unsymmetrical. Because of the molecules and/or the crys
tive lo
gravity of the positive loads does not subsidence with the nega
lectric materials are electronically polarized. When those mat
e
d
moment changes. On account
free on the surface. Therefore, the piezo elect
size from the measurement, which causes
deformation.
10.4.2 Function of Piezo Measuring Transducer
The measuring transducers (MP25 / MP200
measuring cells
the emitting elec
integrated. Because of the
trical load (Coulomb)
h
itting electrical l
available, t e em
The engraved calibration value on the transducer defines the emitted load (Coulom
per New
lo
Example for the calibration value: 172 pC
1
asuring e ctronic has a ch
the transducer into an elec
amplifier integrat
tronic voltage. The voltage
on the measuring inpu
, which
+/- 5
Drift
o Mea
ucers)
nce of
put-tra
gh this input-
e, the ch
ant, to start th
ar
into a positive or negative direct
im
10.4.4 D
The electri
deformatio
idge
sistance of each strain changes when deformed. The cause of this
y be power, pressure, torque, deflection, angle etc. The resistance of
MS (strain gauge) consists
n
t
c