Vibrating Wire Strain Gauges(Embedment Type)

Type VWS-EM vibrating wire embedded strain gauge can be buried in beam piles, pile foundations, supports, hydraulic structures, linings, piers and bedrock of various concrete structures for a long time to monitor its stress and strain. The build-in temperature sensor can simultaneously measure the temperature of the measure point, which is used for temperature correction of the embedded strain gauge. The biggest advantage of the vibrating wire strain gauge is that the sensor is simple in structure, reliable in operation, the output signal is a frequency signal, and the frequency output is not affected by electrical noise, and it can be transmitted for several kilometers without losing the signal. The sensor is mainly used for strain measurement inside concrete structures such as buildings, bridges, highways, railways, subways, tunnels,dams, foundation piles, etc.

Overview

The vibrating wire embedded strain gauge is mainly composed of left and right end supports, steel strings and excitation coils. When the measured structure is strained, the left and right end supports of the vibrating wire strain gauge produce relative displacement and transmit it to the steel string, so that the force on the steel string changes, thereby changing the natural frequency of the steel string. The measuring instrument outputs a pulse or sweep frequency excitation signal, excites the steel string through the coil and detects the vibration frequency of the steel string induced by the coil. The square of the vibration frequency is proportional to the strain of the strain gauge, and the strain of the measured structure is obtained through conversion.

Characteristic:

Vibrating wire theory;
Super strong steel wire;
High stability and precision;
Built-in temperature sensor;
Waterproof up to 2.0MPa;

Application scenarios:

Concrete strain;
Bridge strain;
Building strain;
Tunnel liners strain;
Dam strain;
Steel structure surfaces;

Specifications

Type	VWS-EM15	VWS-EM15A	VWS-EM15M	VWS-EM15H	VWS-EM30
Description	Embedment	Embedment	Embedment	Embedment	Embedment
Active gauge Length(mm)	100	100	100	146	100
Measuring Range(με)	±1500	±1500	±1500	±1500	±3000
Accuracy*	1.0%F.S	0.5%F.S	0.5%F.S	0.5%F.S	1.0%F.S
Sensitivity	1.0με/F	0.5με/F	0.5με/F	0.1με/F	1.0με/F
Resolution	1.0με	1.0με	1.0με	1.0με	1.0με
Coil Resistance	190Ω	190Ω	190Ω	190Ω	190Ω
Build-in TemperatureSensor	NTC3kΩ	NTC3kΩ	NTC3kΩ	NTC3kΩ	NTC3kΩ
TemperatureAccuracy	0.5℃(@-10~70℃)	0.5℃(@-10~70℃)	0.5℃(@-10~70℃)	0.5℃(@-10~70℃)	0.5℃(@-10~70℃)
Temperature Range	-20~80℃	-40~80℃	-40~80℃	-40~80℃	-20~80℃
Waterproof	≥0.2MPa	≥1.0MPa	≥2.0MPa	≥1.0MPa	≥0.2MPa

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