EN
14365216.02 08/2020 EN/DE
Operating instructions magnetostrictive level transmitter, models FLM-CA, FLM-CM
6
The measurement procedure shown in the following figure exploits the physical effect of
magnetostriction and is largely independent of the temperature. In the guide tube, a wire
from magnetostrictive material is stretched. Via the sensor electronics, current pulses
are sent through the wire, which generate a circular magnetic field
. A magnet
, which
is built into the float, acts as the level pick-up. Its magnetic field magnetises the wire axially.
Through the interference of the two magnetic fields, in the area of the float magnet, a
torsion wave
is generated, which runs in both directions along the wire. One wave runs
directly to the probe head, the other is reflected off the lower end of the guide tube. The
time between the sending of the current pulse and the arrival of the wave at the probe head
is measured. From the time elapsed, the float position is determined.
2.3 Scope of delivery
Cross-check scope of delivery with delivery note.
2. Design and function
