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Redundant sensors boost safety in critical apps

Posted: 18 May 2007 ?? ?Print Version ?Bookmark and Share

Keywords:high linearity sensors? compact redundant version? safety critical apps?

MTS Systems Corp. Sensors Division has introduced a redundant version of its G-Series Temposonics sensors to offer maximum safety in critical applications. The GT sensor measures critical variables with two or three independent and identical measurement systems in a single sensor housing.

The GT sensors provide linearity better than 0.02 percent and repeatability better than 0.001 percent. Due to the high linearity, even minimum measurement differences are identified, whereby the error tolerance can be adjusted individually and adapted to the application, said MTS Sensors. The stroke length is also selectable within 25-1,500mm.

The GT sensor is compact with a 70mm hex electronics housing and 10mm measuring rod and standard mounting. Electrical connection options include the use of either three independent integral M16 connectors or three pigtail terminated integral cables.

Designed for applications where a failure could have disastrous effects on safety as well as costs, the GT sensor's measurement systems are completely independent and can be switched on individually. The sensor version with three redundant measurement systems allows redundant measurement without the need for immediate replacement.

The GT sensor is suitable for measurement of linear movements in drives and fluid cylinders or in machine operation including motor-actuated positioning at power station, water, gas or steam turbines, pitch adjustment of wind turbines or marine screw propellers, as well as marine control systems and flood gates.

Each measurement system is comprised of a basic sensor element, and evaluation electronics with separate output signal and supply voltage. The two or three sensor elements are all housed in a standard size pressure-resistant stainless steel pipe for direct stroke measurement in the hydraulic cylinders.

The sensor's pressure rod installs into an industry standard cylinder end cap and piston rod assembly. A position magnet marker, secured to the piston head, travels along the sensor rod without making contact. The resulting sensing system provides highly accurate and reliable piston rod position feedback for the life of the hydraulic cylinder, said MTS Sensor. The GT sensor package can be installed external to cylinders or machine surfaces by means of simple mounting brackets.

- Gina Roos

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