Geosense Template - MGS

DATASHEETMulti-point VW PiezometerFULLY GROUTEDApplicationsFully grouted installation permits multiple piezometers to be simply andreliably installed in a single borehole. The piezometer string and groutpipe are placed in the borehole and cement-bentonite grout is pumpeduntil the borehole is filled.Multi-point Piezometer Strings allow for multiple Vibrating WirePiezometers to be connected on a single cable. This facilitates theinstallation of fully grouted multiple piezometers. The single cableprevents vertical void channels. Tough urethane jacketed, Kevlar ®reinforced, non-stretch cable is employed to withstand the rigors ofinstallation and is entirely water-blocked to minimize any leakage. Noconductors are shared to maximize independent reliability of eachsensor.Vibrating Wire Piezometers provide excellent long-term accuracy,stability of readings and reliability under demanding geotechnicalconditions. Vibrating Wire Piezometers are the electrical piezometers ofchoice as the frequency output of vibrating wire devices is immune toexternal electrical noise, and able to tolerate wet wiring common ingeotechnical applications.Fully-Grouted PiezometersTraditionally, multiple piezometer installations in a borehole were slow,complex, and subject to unintended communication betweenpiezometers.Grouted piezometers are quick and easy to install, have excellent zoneisolation, and have rapid response to pore pressure changes.The fully grouted method is increasingly the preferred standardapproach for installing piezometers in boreholes.~ Ideal when more than onepiezometer reading is needed atvarious depths - at the samelocation~ Assessing performance andinvestigating stability of:- earth fill dams & embankments- slope stability~ Monitoring of:- pressures behind retainingwalls and diaphragm walls- pore pressures during fill orexcavation- pore pressure in landreclamation applicationsFeatures~ No inter-zone leakage~ Simple installation~ Field proven reliability & accuracy~ Will tolerate wet wiring commonin geotechncial applications~ Immune from external electricalnoise~ Signal transmission of severalkilometers~ Cable lengths can be changedwithout affecting the calibration.~ Thermistor for temperaturemeasurement is standard~ Negligible displacement of porewater during the measurementprocess~ Hermetically sealed,stainlesssteel construction~ Heavy case to minimise readingerrors caused by overburdenpressure~ Data logger compatibleA division ofMarton Geotechnical Services LtdNova House, Rougham Industrial Estate, Rougham, Bury St Edmunds, Suffolk IP30 9ND, Englandwww.mgsgeosense.co.uk e info@mgsgeosense.co.uk t +44(0)1359 270457 f +44(0)1359 272860

Multi-point PiezometerVibrating Wire Piezometer SpecsDESCRIPTIONSPECIFICATIONThe following specifications are for an individual vibrating wire piezometer.Over rangeResolutionAccuracy2 X F.S.0.025% F.S. minimum0.1% F.S.Operating Temperature -20 to 80°CDiaphragm DisplacementThermal Zero ShiftMaterials