Wire Deformeters

Reference products codes: D313F, D314F

Wire deformometers allows to monitor the changes in the distance between two anchor points.

Typical applications include measurements of small cracks, convergence monitoring in tunnel and structural deformations.

The USB wire deformometer consist of an aluminium logger and transducer box with a tensioned steel wire having 80mm stroke.

Electrical deformometer, available with both potentiometer or vibrating wire transducer, is composed by a stainless steel body mounted on fixing plate. A kevlar rope realizes the connection between the transducer and the target

A linear potentiometer is a device with a movable slider, usually called wiper, that makes electrical contact along a fixed resistance strip. A regulated DC voltage is applied to the two ends of the resistance strip: the voltage between one end of the strip and the contact point of wiper and strip is measured as the output signal.
Sisgeo instruments that utilize linear the linear potentiometer technology have often a 4-20mA output because electrical (Ampere) signals are more suitable for long distance transmission than tension (Volt) signal.

Vibrating wire transducer is essentially composed by a taut wire clamped at its ends and tensioned so that it is free to vibrate at its natural frequency. The frequency of vibration varies with the wire tension and thus small relative movements between the two end clamps.
With VW transducers frequencies rather than voltage levels are measured, so a dedicated readout/datalogger must be used to measure the resonant frequency. These ones excites the VW transducer, measures the response, performs some calculations on the response, and returns the result.
SISGEO VW transducer uses ‘pluck and read’ method and not ‘auto resonant’ method; when the readout/datalogger plucks the wire a magnetic attraction is created to the coil and the wire start to vibrate and it causes an alternating voltage of the same frequency of the natural frequency of the wire; the voltage signal is transmitted on the cable and read from the readout/datalogger.
VW transducers have a reputation for long expected life and long-term stability.

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Datasheet

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Data processing

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Datasheet

Manual

Data processing

Faq

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