Housing; Measuring Process, Output Signal; Disturbance Variables - HBM C6A Notice De Montage

C6A

3.2 Housing

The housing protects the application from moisture and aggressive media. No
load or force may be initiated in the transducer via the housing.
The cable box is cast using a special casting compound and must not be
opened.

3.3 Measuring process, output signal

The force acting in the direction of measurement elastically deforms the
measuring spring and thus the S/G. The S/G changes its ohmic resistance in
proportion to the change in its length. The Wheatstone bridge is thereby
staggered. If an excitation voltage is applied the circuit provides an output
signal which is proportional to the change in resistance and thus also
proportional to the force applied.
The electrical connection of the transducer is executed in a six wire circuit
(see page 19).

3.4 Disturbance variables

Torsion, bending and transverse load are disturbance variables and are
therefore to be avoided. If necessary they can be remedied with HBM
mounting accessories (section 5.3).
The effects of temperature on the zero signal (S/G bridge and housing) and
on the sensitivity are compensated.
Changes in the ambient pressure act as additive (subtractive) forces. These
are scarcely of importance when compared with large nominal loads.
A0638−2.3 en/de/fr
9
HBM