Vibrating Wire Displacement Transducers

MODEL DP44k

Dustin vibrating wire displacement transducers are designed to measure displacements across joints and cracks in concrete, rock, soil and structural members.
In essence, the transducer consists of a vibrating wire in series with a tension spring. Displacements are accommodated by a stretching of the tension spring, which produces a commensurate increase in wire tension.

The wire and spring are connected
to a free-sliding rod which protrudes
from, and is free to slide inside, a
protective outer tube. An O-ring seal
prevents water from entering.
The frequency signal is transmitted
through the cable to the readout
location, conditioned, and displayed
on portable readouts or dataloggers.