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Load cell amplifier enables tunnel monitoring system

05 October 2014

Instrumentation to monitor the displacement on the joints within a major new tunnel is enabled with Mantracourt's SGA load cell amplifiers.

Applied Measurements created a bespoke bridge monitoring system using three 50mm displacement transducers, forming a triaxial measurement of each joint

Load cell amplifiers from the specialist electronic instrumentation manufacturer, Mantracourt Electronics, are being used within the monitoring systems of the Marmaray Project, a major new rail tunnel project in Turkey. The 76.3km long tunnel is the deepest immersed tunnel in the world and is regarded as the foremost challenging infrastructure project in Turkey.

The Marmaray development team needed to monitor the displacement of the joints within the tunnel. Mantracourt's technical partner, Applied Measurements, created a bespoke bridge monitoring system using three 50mm displacement transducers, forming a triaxial measurement of each joint.

Applied Measurements provides a comprehensive range of load cell and force sensors for use in a broad range of applications. They also provide a design service for applications needing bespoke features and special performance requirements - the Marmaray Project being a good example.

The displacement transducers used in this application are based on strain gauge technology that converts the linear movement of the joints within the tunnel into an analogue electrical signal. Mantracourt’s SGA load cell amplifiers are used to amplify the transducers signals, enabling the Marmaray team to accurately monitor joint displacement within the tunnel.  

The SGA series of load cell amplifiers from Mantracourt are capable of delivering highly stable, high speed, industry standard analogue outputs, such as 0-10Vdc or 4-20mA, from very low-level input signals.

“We chose Mantracourt's SGA load cell amplifiers for this project, due to their high stability and accuracy,” recalls Applied Measurements' Darren Skipp. “This level of performance is essential for such a major project, and we are very pleased with the way the system is performing.”

“We are very proud to once again see our technology playing a vital role in a major infrastructure project,” says Mantracourt's Louise Stubbs. “This project also demonstrates the value of our global network of technical partners, and how they are able to work at a local level to create bespoke instrumentation solutions.”

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