Piezoelectric Measurement Chains - HBM MP85A Series Operating Manual

Screw terminal 3
External
power supply
Screw terminal 5
Screw terminal 6
Fig. 5.8 Power supply of active sensors (schematic diagram)
Important
The amplitudes of the measurement signal and zero index signal must each be
at least 1.2 V.
The voltage to measurement ground must not exceed 14 V in any line. If
necessary, the voltage must be reduced by means of a voltage divider.
5.5.4

Piezoelectric measurement chains

A charge amplifier is required to operate the piezoelectric sensors on the
MP85A process controller, which converts the electrical charge generated by
the sensor into a 10 V voltage signal.
MP85A
GND_ext 5
24 V_ext 6
Internal MP85A
wiring
A0293_06_E00_03 HBM: public
Electrical connection
GND_int 5 V_int
S1
7 8
GND +5 V (int)/24 V (ext.)
7 8
33