Jointmeters and Crackmeters

Wire Displacement Sensor

///Wire Displacement Sensor

Description

L’estensimetro a filo viene solitamente utilizzato per controllare e misurare movimenti in frane e comunque fra due punti distanti fra loro.
The wire deformometer is usually used to monitor and measure movements in landslides by measuring two points distant from each other. The instrument is made from the protected sensor in a sturdy aluminum box, by a non-deformable wire constantly kept in tense by a tensioning device and a fixing device to fix the other end of the wire to the measuring point.
The instrument is composed of a sensor protected by a sturdy aluminum box, and a non-deformable wire constantly kept tense by a tensioning device and a fixture securing one end of the wire to the measuring point.
The crackmeters or wire deformometers made by Pizzi Instruments are both with a potentiometric sensors and vibrating wire sensors.
Pizzi Instruments offers both wire deformometers with potentiometric sensors or with vibrating wire sensorsThe choice of sensor depends on the specific requirements of the monitoring project and the type of application
If required by our customers, we are able to suggest the best solution for a specific application
Instruments with different wire lengths are available, depending on the specific requirements of the installation site.
The wire deformometer, connected to an automatic acquisition system, allows real time monitoring and measuring of landslide movements, together with the possibility of managing local and remote alarms if thresholds are exceeded.
The wire deformometers can be read manually with our portable units (DEC 3000 and handheld unit Dec5 for vibrating wire sensors) or automatically with our dataloggers (CUM3000 or /and VW Brick 2 or VW Brick 8, or CRio VW, depending on sensor type). For specific needs and requests, we are able to develop and manufacture customized products with different characteristics from standard.

Applications

Typical applications include:

  • Earthslides or rockslides
  • Monitoring of large displacements and fractures
  • Bridges and viaducts
  • Dams
  • Walls and diaphragms
  • Galleries
  • Excavations
  • Poles
  • Buildings

Features and Benefits

  • Large measuring range
  • Large distance between measuring points
  • Rugged for outdoor applications
  • Easy to use
  • Automatable
  • Built-in automatic monitoring systems

Measurement Principle

The instrument is made of a sturdy body containing both the sensor and the tensioning systemThe sensors used are both vibrating wire and potentiometric; for the latter converters are integrated into the body of the instrument for 4-20mA output or in voltage. The strain gauge wire, connected to an automatic acquisition system, allows real time measuring and monitoring of landslide movements with the possibility of managing local and remote alarms if thresholds are exceeded.
Special wire hooking systems are available and produced on demand

Technical Specifications

Potentiometer Wire Displacement

Technology Potentiometer
Range  (mm) 50 mm ÷ 2000 mm
Resolution Infinite
Linearity From 0,02%F.S. to 1%F.S. (depend by range)
Repeatibility ±0,02% F.S.
Output Potentiometer; 4-20mA; voltage
Power Supply 9 ÷ 35 Vdc @ 4-20mA; max 30 Vdc @ potentiometer
Material of the sensor Thermoplastic
Wire Stainless steel  –  diameter 0,46 mm
Maximum length of the wire 15 mt with kit of wire extension
Protection IP65
Temperature of operation -25°C ÷ +75 °C

Vibrating Wire Extensometer

Technology Vibrating Wire
Range 10;20;50;100 mm
Resolution < 0,02% f.s.
Linearity < 0,2% f.s.
Repeatibility ± 0,02% f.s.
Output Frequency
Power Supply
Material of the sensor Stainless steeel
Wire Stainless stessl ; diameter 2mm
Maximum length of the wire Up to 30 mt
Protection IP65
Temperature of operation -25°C ÷ +60 °C

Accessories and related products

Fixing Kit of the wire
Junction Boxes
Multipolar cable
DEC 5
DEC 3000
CUM 3000
MUX
Selection and Measure Box
Measure Box

Technical Assistance

If you have any requests or questions about our instruments or if you have special needs that require different solutions from the standard, please contact us. Our team will provide all the necessary information and will be very happy to work with you to study, develop and customize instruments and solutions suitable for your specific needs.
All information in our datasheet is subject to change without prior notice.
Please check the datasheet/details carefully and contact Pizzi Instruments for further information