Fully Grouted Multi-Point Piezometer String

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Fully grouted installation permits multiple piezometers to be simply and reliably installed in a single borehole. The piezometer string and grout pipe are placed in the borehole and cement-bentonite grout is pumped until the borehole is filled.

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Overview

Fully grouted installation permits multiple piezometers to be simply and reliably installed in a single borehole. The piezometer string and grout pipe are placed in the borehole and cement-bentonite grout is pumped until the borehole is filled.

Multi-point Piezometer Strings allow for multiple Vibrating Wire Piezometers to be connected on a single cable. This facilitates the installation of fully grouted multiple piezometers. The single cable prevents vertical void channels. Tough polyurethane jacketed, Kevlar® (Kevlar® is a registered trademark of E.I. duPont de Nemours and Company or its affiliates) reinforced, non-stretch cable is employed to withstand the rigors of installation and is entirely water-blocked to minimize any leakage. No conductors are shared to maximize independent reliability of each sensor.

RST Vibrating Wire Piezometers provide excellent long-term accuracy, stability of readings, and reliability under demanding geotechnical conditions. Vibrating Wire Piezometers are the electrical piezometers of choice as the frequency output of vibrating wire devices is immune to external electrical noise and able to tolerate wet wiring common in geotechnical applications.


Fully Grouted Multi-Point Piezometer String Specifications

*The following specifications are for an individual vibrating wire piezometer.

ITEM SPECIFICATION
Over range 2 X F.S.
Resolution 0.025% F.S. minimum
Accuracy 0.1% F.S.
Operating Temperature -20 to 80°C (-4 to 176°F)
Diaphragm Displacement <0.001 cc at F.S.
Thermal Zero Shift <0.05% F.S./°C
Materials Hermetically sealed stainless steel housing
Thermistor Type NTC 3K Ohms @ 25°C
Thermistor Interchangeability ±0.2°C (optional ±0.1°C)
Thermistor Resolution 0.1°C
Filter 50 micron sintered filter.


Electrical Cable Specifications

NUMBER OF PIEZOMETERS PART # DESCRIPTION
2-3 Piezometers EL380012 12 conductor, Kevlar® wire with water-blocked polyurethane jacket
4-6 Piezometers EL380013P 13 pair, Kevlar® wire with water-blocked polyurethane jacket

Fully Grouted Multi-Point Piezometer Strings are commonly used for:

  • When more than one piezometer reading is needed at various depths – at the same location.
  • Assessing performance and investigating stability of:
    – earth-fill dams & embankments
    – slope stability
  • Monitoring of:
    – pressures behind retaining walls and diaphragm walls
    – pore pressures during fill or excavation
    – pore pressure in land reclamation applications

Fully Grouted Multi-Point Piezometer String Ordering Info

Due to the semi-custom nature of Multi-Point Piezometer Strings, please contact RST Instruments for complete ordering info. Ordering info will be dependent on re-quired cable depth, number of piezometers per string and measurement parameters regarding pressure and/or temperature.

PART # DESCRIPTION PRESSURE RANGES DIMENSION
VW2100MP-XXXX Multi-Point Piezometer String 0.35, 0.7, 1.0, 2.0, 3.0, 5.0, 7.0, and 10.0 MPa (Standard model vibrating wire piezometer ranges shown). Dimensions dependant on cable and pressure ranges chosen.

 

File Name

Fully Grouted Multi-Point Piezometer String

Resource Type

Brochure
Language Version Download
English MIB0051E

Speak with an Expert

I’m very happy with the quality of the instrumentation and technical support from RST, as always. They worked with us from the initial stages of the project to ensure that we were fully prepared and equipped to use the RSTAR network for the first time. They delivered everything within the tight project time frame to ensure that there were no delays on site, and the submersible tilt meters looked like new even after over twelve months of being submerged in Thames water!
 
-Richard Lipscombe, BEng (Hons), Director & Principle Consultant - RL Geotechnical Ltd