Application & Design
04.06.2014
Operation Manual
NC: 6110-00125
7 Application
Chapter 3: Application & Design
3.1 Application
The inductive transducers PR 9350 or the set K 20 315 serve the measurement of static and
dynamic displacements and - in connection with carrier frequency measuring bridges - of
physical quantities (tensile and compressive forces, pressure of gases and liquids, thickness
of materials, transverse moments) which may in any way be converted to linear movements
by using relevant accessories.
The special features of these transducers are a high resolution over the entire measuring
range, small hysteresis, compact construction and the little mass of the tracing pin (solenoid
plunger). Thus, the controlling forces on the measuring target may be neglected.
The temperature drift is extremely small because the compensation coil is wound directly
over the measuring coil.
Installation of these transducers are imaginably easy. The transducer permits dynamic
measurements up to 1250Hz.
The differential coil of the PR 9350 series consists of a coil form with two windings and a
tracing pin with a ferromagnetic core which moves within the coil. If the tracing pin is placed
precisely in the middle of the coil, the impedance of both windings are identical. The
impedance of the windings will increase on one side and decrease on the other side - if the
tracing pin with the ferromagnetic core moves from the middle position to one end of the
transducer.
By complementing the windings with resistors to a Wheatstone bridge, and by supplying this
bridge with a carrier frequency, the measuring output of the bridge reads a voltage which is
proportional to the displacement of the tracing pin. The tracing pin is freely movable and has
a threaded rod (M3) for the mechanical adaptation to the measuring target. On top of the
housing there is a 3-pole Cannon socket for the electric connection. Inductive transducers of
type PR 9350 or the set K 20 315 are preferably used with the MMS 3410 transmitter or with
the A 6410 monitor.
The PR 9350 is available with several measuring ranges from ±12mm up to ±150mm.
The set K 20 315 consists of a PR 9350 sensor mounted in a housing inclusive connection
cable.
