VW Embedment Jointmeter

Applications

The VW embedment jointmeter is used to monitor movement at joints in mass-concrete structures such as abutments, foundations, and dams.

Installation and Operation

Components of the embedment jointmeter include a socket, a transducer housing, and a submersible VW displacement transducer. The socket is plugged and embedded in the first pour. When the forms are removed, the transducer housing is inserted through the adjacent forms and the transducer shaft is screwed to the base of the socket. The housing is then embedded in the adjacent pour of concrete.

A change in the distance across the joint causes a change in the frequency signal produced by the VW displacement transducer when excited by a readout or data logger. The readout processes the signal, applies calibration factors, and displays a reading in millimeters or inches. The initial reading is used as a datum. Subsequent readings are compared to the datum to calculate the magnitude, rate, and acceleration of movement at the joint.

Advantages

High Accuracy: The VW jointmeter provides an accuracy of 0.5% full scale and a repeatability of ±0.3 mm.

Easy Installation: The target and the transducer are installed in separate pours. The transducer housing simply screws into the target.

Accommodates Shear: The transducer is mounted on universal joints that allow approximately 10 mm of shear movement in any direction.

Temperature Measurement: The VW jointmeter is equipped with a temperature sensor.

Manual or Automatic Readings: The jointmeter connects easily to a data logger for unattended monitoring.

For more information

Please download the data sheet and manual for the VW Embedment Jointmeter. The data sheet can be viewed and printed with Adobe Acrobat Reader.

 

VW Embedment Jointmeter Specifications

VW EMBEDMENT JOINTMETER
Jointmeter52632244The VW embedment jointmeter includes a VW submersible displacement transducer with built-in thermistor or RTD, a transducer housing, and a socket with plug for installation.Signal cable is ordered separately.
Range50 mm (2")*
Resolution0.025% FS
Calibration Accuracy±0.1% FS
Repeatability±0.5% FS
Waterproof17 bar (250 psi)*
Materials300-series stainless steel
Socket Size51 mm diameter, 90 mm long (2 x 3.5"), Stainless Steel
Transducer Housing51 mm diameter, 420 mm long (2 x 16.5"), PVC
*Other ranges and waterproof ratings can be quoted on request
Signal Cable
Signal Cable50613824Shielded cable with four 22-gauge tinned copper conductors and polyvinyl chloride (PVC) jacket
Universal Terminal Box57711600Provides connections for 12 sensors and an indicator. Sensors selected by rotary switch. Weatherproof fiberglass box measures 290 x 345 x 135 mm deep (11.5 x 13.5 x 5.25")
Universal Connector57705001Optional connector. Not used when signal cable
is terminated at data logger or terminal box
READOUTS & DATA LOGGERS
ReadoutsVW Data Recorder and other pluck-type VW
readouts. See separate data sheets
VW MiniLogger for 1 Sensor52613310
4-Channel V-Logger52615140
Campbell Scientific Data LoggersVW displacement transducers connect directly to the VW MiniLogger, V-Logger and Campbell Scientific CR6. Campbell Scientific CR800 or CR1000 require an AVW200 vibrating wire adapter. See separate data sheets.