Version 2.1
en MBI 46.31 operating instruction.docx
Issue date: 01/2022
Page 11 of 42
4.3 Suitable displacement sensors
The MBI 46.31 CF measuring amplifier can be used with a variety of inductive
sensors. For details on the requirements, refer to the technical specifications in
chapter 11.
In particular check the following:
•
Electrical design (type of displacement sensor),
•
Required carrier frequency,
•
Excitation voltage and
•
Rated output / sensitivity.
The following chapters describe the electrical design of the three displacement
sensor types offered by MESSOTRON.
4.3.1 Linear Variable Inductance Transducers (LVITs)
Electrically displacement sensors based on the differential inductor principle,
also called LVITs, represent a Wheatstone half-bridge consisting of two
measuring coils. If the core moving inside the coils is in its mid-position
(electrical zero), both measuring coils will show the same impedance. The
bridge circuit is balanced. The measurement voltage is zero.
Figure 2
Measuring amplifier with differential inductor
NOTE
U
Out
A
Immersion-
core
°
°
°
°
U
Exc
0 V
A
B
A
B
Oscillator
Schematic circuit diagram
of CF amplifier
AMP
Filter
U
Meas
-s
0
+s
°
°
