RST Instruments VW2100-DP User Manual

ELM0005P
All efforts have been made to ensure the accuracy and
completeness of the information contained in this document. RST
Instruments Ltd reserves the right to change the information at any
time and assumes no liability for its accuracy.
Copyright © 2019. RST Instruments Ltd. All rights reserved.
Document Number: ELM0005P
Release Date: July 10, 2019
VW2100 Vibrating Wire
Piezometer
Instruction Manual

RST Instruments VW2100-DP Specifications

General

Model	VW2100-DP
Category	Measuring Instruments
Manufacturer	RST Instruments
Operating Temperature	-20°C to +80°C
Storage Temperature	-40°C to +85°C
Enclosure Rating	IP68
Material	Stainless Steel
Channels	1
Measurement Range	0 to 1000 kPa
Resolution	0.025% FS
Accuracy	±0.1% of reading
Communication	RS-485
Output Signal	Vibrating Wire Frequency
Pressure Range	0 to 1000 kPa

Summary

Vibrating Wire Principle of Operation

Piezometer Calibration Procedures

Reading and Initializing Piezometers

Pressure Calculation Equations

Linear Pressure Equation

Second Order Polynomial Pressure Equation

Piezometer Installation: Filters and Fill

Installation in Fill Materials

Piezometer Installation in Boreholes

Sand/Bentonite and Bentonite Plug Methods

Details borehole installation using Sand/Bentonite and Bentonite Plug methods.

Fully Grouted Method

Describes the installation process using a cement-bentonite grout mixture.

Driving Piezometers in Soft Ground

Soft Ground Installation Procedure

Cable Identification, Routing, and Protection

Lightning and Surge Protection

Piezometer Troubleshooting Guide

No Piezometer Reading

Steps to diagnose and resolve a lack of instrument readings.

Unstable Piezometer Readings

Steps to diagnose and resolve unstable instrument readings.

Thermistor Reading Issues

Troubleshooting low or high thermistor temperature readings.

Appendix A: VW2100 Calibration Sheet

Appendix D: Second Order Polynomial for Accuracy