DM200 Series Vibrating Wire Rebar Stress Meter

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DM200 Series Vibrating Wire Rebar Stress Meter

Product ID：CLQTlxlcly037

Price: US$120.00 ~ US$280.00 PDF Format

Supply Ability:50 SETS/MON

Port:SHENZHEN

Product Introduction
Other information

Model NumberDM200

Brand NameNJDANMO

Payment TermsTT，PAYPAL，Alibaba.com Pay

DM200 Series Vibrating Wire Rebar Stress Meter
Product Overview
The DM200 Series Vibrating Wire Rebar Stress Meter is a high-precision sensor designed for long-term monitoring of stress in reinforcing steel bars embedded in concrete structures. Based on reliable vibrating wire technology, the instrument converts mechanical stress into stable frequency signals for accurate digital measurement over long cable distances.
With an expanded measuring range of up to 500 MPa in both tension and compression, the DM200 Series is widely used in structural health monitoring (SHM), geotechnical engineering, and civil infrastructure projects. It also measures installation-point temperature, allowing automatic temperature compensation for improved stress measurement accuracy.
The sensor features an integrated force transmission structure, high waterproof performance, and excellent long-term stability, making it suitable for permanent installation in harsh underground and outdoor environments.

Key Features
• Measuring range up to 500 MPa for both tensile and compressive stress
• High sensitivity with excellent long-term measurement stability
• Integrated sensing element and force transmission structure for improved accuracy
• Mechanical sealing, penetration connection, and resin encapsulation for superior waterproof protection
• Vibrating wire technology with stable digital frequency output
• Long-distance signal transmission with cable lengths up to 1000 m
• Built-in temperature measurement for accurate temperature compensation
• Suitable for permanent embedded installation in concrete structures

Working Principle
The DM200 Series utilizes vibrating wire sensing technology to measure stress in reinforcing steel bars. As external loads cause deformation of the reinforcement, the tension of the internal vibrating wire changes accordingly. These changes are converted into frequency signals, which are measured by a compatible vibrating wire data logger.
Since frequency signals are highly resistant to electrical interference and signal attenuation, the system provides reliable long-term monitoring even with extended cable lengths. The integrated temperature sensor records ambient temperature simultaneously, enabling accurate correction of stress measurements caused by thermal expansion.

Technical Specifications

Parameter	Specification
Model	DM200 Series
Sensor Type	Vibrating Wire Rebar Stress Meter
Measuring Range	Up to 500 MPa (Tension & Compression)
Measurement Principle	Vibrating Wire Frequency
Output Signal	Digital Frequency Output
Temperature Measurement	Integrated Temperature Sensor
Temperature Compensation	Supported
Waterproof Design	Mechanical sealing + penetration connection + resin encapsulation
Maximum Cable Length	Up to 1000 m
Installation	Embedded in reinforced concrete

Customized specifications are available upon request.

Typical Applications
The DM200 Series is widely used in structural safety monitoring and geotechnical engineering projects, including:
• Building foundations
• Pile foundations
• Diaphragm walls
• Deep foundation pit excavation
• Tunnel linings
• Bridges
• Slopes and retaining structures
• Wharves and docks
• Shipyards
• Hydraulic gates
• Concrete retaining walls
• Anchor force monitoring
• Rock bolt monitoring
• Pullout force testing
• Long-term structural health monitoring (SHM)

DM200 Series vs Conventional Electrical Strain Sensors

Feature	DM200 Vibrating Wire Rebar Stress Meter	Conventional Electrical Strain Sensor
Measurement Principle	Vibrating wire frequency	Resistance strain
Long-Term Stability	Excellent	Moderate
Electromagnetic Interference Resistance	Very high	Lower
Cable Transmission Distance	Up to 1000 m	Typically much shorter
Waterproof Performance	Excellent	Moderate
Temperature Compensation	Integrated	Often external
Permanent Monitoring	Ideal	Limited
Civil Engineering Applications	Excellent	Suitable for short-term testing

Frequently Asked Questions
What does the DM200 Series measure?
It measures the stress in reinforcing steel embedded in concrete structures and can also monitor anchor force and pullout force.
What is the maximum stress range?
The sensor supports tensile and compressive stress measurements up to 500 MPa.
Can the sensor measure temperature?
Yes. An integrated temperature sensor enables accurate temperature compensation for stress measurements.
Is the sensor suitable for long-term embedded monitoring?
Yes. The waterproof construction and vibrating wire technology make it ideal for permanent installation in concrete structures.
How far can the signal be transmitted?
The digital frequency output supports cable extensions of up to 1000 meters, making it suitable for large infrastructure projects.
Where is the DM200 Series commonly used?
It is widely applied in bridges, tunnels, foundations, diaphragm walls, deep excavations, slopes, docks, hydraulic structures, and other civil engineering projects requiring long-term structural monitoring.

Why Choose the DM200 Series Vibrating Wire Rebar Stress Meter?
The DM200 Series combines high measurement accuracy, exceptional long-term stability, and robust environmental protection in a compact embedded sensor. With a wide 500 MPa measuring range, integrated temperature compensation, long-distance digital transmission, and reliable waterproof design, it provides an ideal solution for structural health monitoring, geotechnical instrumentation, and infrastructure safety assessment across demanding engineering applications.

Frequently Asked Questions
What does the DM200 Series measure?
It measures the stress in reinforcing steel embedded in concrete structures and can also monitor anchor force and pullout force.
What is the maximum stress range?
The sensor supports tensile and compressive stress measurements up to 500 MPa.
Can the sensor measure temperature?
Yes. An integrated temperature sensor enables accurate temperature compensation for stress measurements.
Is the sensor suitable for long-term embedded monitoring?
Yes. The waterproof construction and vibrating wire technology make it ideal for permanent installation in concrete structures.
How far can the signal be transmitted?
The digital frequency output supports cable extensions of up to 1000 meters, making it suitable for large infrastructure projects.
Where is the DM200 Series commonly used?
It is widely applied in bridges, tunnels, foundations, diaphragm walls, deep excavations, slopes, docks, hydraulic structures, and other civil engineering projects requiring long-term structural monitoring.