HBK HBM CFT+ Montageanleitung Seite 11

5 STRUCTURE AND MODE OF OPERATION
5.1 Force transducer operation
The force transducers of the CMC+ series operate in accordance with the piezoelectric
principle. Compressive forces are transferred via pre-stressed force application surfaces
onto the two measuring elements made of quartz (nominal (rated) forces 50 kN, 70 kN
and 120 kN) or gallium phosphate (nominal (rated) force 25 kN). They separate the elec­
trical charges in proportion to the force curve. Charges are produced on the surface of
the measuring elements that are forwarded by an electrode between the measuring ele­
ment and the sensor housing to the force transducer's male connector. If a charge ampli­
fier is connected via a suitable cable, the charge signal can be converted into a voltage
signal or a digital force signal.
Measuring
elements
Force application surface
Fig. 5.1 Basic layout of CFT+ series force transducers
CFT+
STRUCTURE AND MODE OF OPERATION
Anti-fatigue bolt
Clamping device
Thrust piece
Housing
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