Vibrating-wire strain gauge for long-term strain monitoring of concrete, rock and steel structures, with built-in temperature measurement.
Overview
A vibrating-wire strain gauge is an embedment sensor for long-term monitoring of strain in concrete, rock/soil and steel structures. A tensioned steel wire in an electromagnetic coil changes its tension and hence its resonant frequency as the host structure deforms; strain is derived from the measured frequency, while a built-in thermistor provides temperature compensation. The gauge consists of a stainless-steel protective tube, end anchor blocks, the wire, an electromagnetic exciter/receiver coil and a signal cable. It can be embedded in concrete or welded to steel, offering long-term stability, noise immunity and long signal-transmission distance. Widely used for long-term safety monitoring of dams, bridges, high-rises, metro tunnels, excavations and piles.
Applications
• Road and highway engineering laboratory testing
• Construction material quality control and acceptance
• Research and teaching laboratories
• Third-party inspection and certification bodies
Features
• Robust construction suitable for both laboratory and field use
• Compliant with relevant Chinese and international testing standards
• Complete with calibration certificate and operation manual
Technical Specifications
| Item | Specification |
| Principle | vibrating-wire (frequency output) |
| Standard range | 3000 με (±1500 με) |
| Typical frequency range | approx. 500–1000 Hz |
| Non-linearity | ≤0.1% FS (polynomial) |
| Resolution | approx. 0.1% FS |
| Gauge length | 150 mm |
| Operating temp. | -20 to +80°C |
| Built-in temp. | thermistor |
| Construction | stainless tube, end anchors, cable |
| Mounting | embed in concrete / weld to steel |
| Output | frequency signal, long-distance transmission |
| EMI | good noise immunity, long-term stability |
| Applications | dams, bridges, high-rises, tunnels, excavations, piles |
Standards
GB/T, JTG, ASTM
Standard Delivery
• Main instrument unit
• Power cable
• Operation manual
• Spare parts kit
FAQ
Q1: What standards does the Vibrating-Wire Strain Gauge comply with?
A1: The Vibrating-Wire Strain Gauge is designed and manufactured in accordance with relevant Chinese national (GB) and transport industry (JTG) standards, as well as applicable ASTM and AASHTO international standards. A calibration certificate traceable to national standards is provided with each unit.
Q2: How often should the Vibrating-Wire Strain Gauge be calibrated?
A2: We recommend annual calibration by authorized technicians or by iRoad after-sales service center. For high-frequency laboratory use, semi-annual calibration is advised. The instrument is supplied with a factory calibration certificate.
Q3: What is the lead time and do you provide training?
A3: Standard units are usually shipped within 7-15 working days. Custom configurations may require 20-30 days. iRoad provides on-site installation, commissioning and operator training for major equipment; remote video guidance is available for standard laboratory instruments.
Overview
A vibrating-wire strain gauge is an embedment sensor for long-term monitoring of strain in concrete, rock/soil and steel structures. A tensioned steel wire in an electromagnetic coil changes its tension and hence its resonant frequency as the host structure deforms; strain is derived from the measured frequency, while a built-in thermistor provides temperature compensation. The gauge consists of a stainless-steel protective tube, end anchor blocks, the wire, an electromagnetic exciter/receiver coil and a signal cable. It can be embedded in concrete or welded to steel, offering long-term stability, noise immunity and long signal-transmission distance. Widely used for long-term safety monitoring of dams, bridges, high-rises, metro tunnels, excavations and piles.
Applications
• Road and highway engineering laboratory testing
• Construction material quality control and acceptance
• Research and teaching laboratories
• Third-party inspection and certification bodies
Features
• Robust construction suitable for both laboratory and field use
• Compliant with relevant Chinese and international testing standards
• Complete with calibration certificate and operation manual
Technical Specifications
| Item | Specification |
| Principle | vibrating-wire (frequency output) |
| Standard range | 3000 με (±1500 με) |
| Typical frequency range | approx. 500–1000 Hz |
| Non-linearity | ≤0.1% FS (polynomial) |
| Resolution | approx. 0.1% FS |
| Gauge length | 150 mm |
| Operating temp. | -20 to +80°C |
| Built-in temp. | thermistor |
| Construction | stainless tube, end anchors, cable |
| Mounting | embed in concrete / weld to steel |
| Output | frequency signal, long-distance transmission |
| EMI | good noise immunity, long-term stability |
| Applications | dams, bridges, high-rises, tunnels, excavations, piles |
Standards
GB/T, JTG, ASTM
Standard Delivery
• Main instrument unit
• Power cable
• Operation manual
• Spare parts kit
FAQ
Q1: What standards does the Vibrating-Wire Strain Gauge comply with?
A1: The Vibrating-Wire Strain Gauge is designed and manufactured in accordance with relevant Chinese national (GB) and transport industry (JTG) standards, as well as applicable ASTM and AASHTO international standards. A calibration certificate traceable to national standards is provided with each unit.
Q2: How often should the Vibrating-Wire Strain Gauge be calibrated?
A2: We recommend annual calibration by authorized technicians or by iRoad after-sales service center. For high-frequency laboratory use, semi-annual calibration is advised. The instrument is supplied with a factory calibration certificate.
Q3: What is the lead time and do you provide training?
A3: Standard units are usually shipped within 7-15 working days. Custom configurations may require 20-30 days. iRoad provides on-site installation, commissioning and operator training for major equipment; remote video guidance is available for standard laboratory instruments.
