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Redundant sensor suits space-limited apps

Posted: 19 Jun 2007 ?? ?Print Version ?Bookmark and Share

Keywords:hydraulic position sensor? mobile equipment sensors? redundant sensors?

MTS Systems Corp., Sensors Division, has expanded its mobile hydraulic position sensor technology with a product that provides fully redundant measurement capabilities. The Temposonics MT sensor is a magnetostrictive position sensor specifically designed to be embedded in welded and tie-rod style cylinders or any space-limited cylinder application. This fully redundant sensing solution offers an additional level of inherent safety, said MTS.

The MT sensor provides a measuring range of 50-1,500mm, while maintaining high levels of accuracy and repeatability, said MTS. Linearity is less than 0.04 percent and repeatability is less than 0.005 percent. The sensor operates over the full temperature range of -40C to 105C required by mobile hydraulics applications and comes standard with a cable connection that is compatible with typical mobile equipment electrical connector requirements.

Each measurement system is comprised of a basic sensor element and evaluation electronics with separate output signal and supply voltage. The two sensor elements are 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 redundant sensor outputs allow for the position measurement validity to be checked by total formation with inverse output signal programming. Alternatively, the sensor interface electronics or control system can monitor the difference between the measured position values. If variations are detected, remedial measures can be taken immediately. The measurement systems are completely independent and can be switched on individually. The sensor version with two redundant measurement systems allows redundant measurement without the need for immediate replacement.

- Gina Roos

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