Page 10
Safety
induSENSOR DTD / MSC7xxx
2.
Functional Principle, Technical Data
2.1
Functional Principle
The DTD / MSC 7401 / 7802 / 7602 series are single- and multi-channel miniature sensor controllers for the
operation of inductive displacement sensors based on the LVDT principle (full bridge) and for half-bridge
sensors.
An electronic oscillator supplies the primary coil with an alternating current of constant frequency and ampli-
tude. For optimal control of the respective sensors, the frequency and the supply voltage can be set
The demodulator electronics transforms the signal of the two (secondary) coils into the set output signal. With
the setting possibilities for zero point and gain, the user can adapt the equipment to the task to be performed
The output signal increases, when the plunger is moved into the sensor. If the reverse effective direction is
required (i.e. the signal becomes smaller when the plunger is inserted), replace the connections
Sec and Secondary -, or make the according setting in the controller
.
20 mA 10 V
6 V
2 V
0 %
50 %
100 %
Measuring range
12 mA
4 mA
Signal
Plunger
Sensor
Fig. 1 Measuring principle
