The positioner portfolio of the Industry Automation Division of Siemens has recently been supplemented by a rugged new device, the Sitrans VP300. Simple and easy to handle, the Sitrans VP300 is especially designed for use in the paper, mining and oil and gas industries. Developed according to safety integrity level (SIL) guidelines the unit features SIL-certified partial stroke testing (PST).
Air exhausting in the single-acting device is SIL 2 rated. Both the single-acting and double-acting versions of the positioner feature aluminium housing with high protection IP66/NEMA 4x and are especially resistant to vibrations. The device can be used in applications down to -40°C and can even operate in damp air which is contaminated with oil or particles.
A rugged mechanical Opos interface connection can be used for fast and simple installation. Only two screws are required on the front of the positioner to attach it to the drive. The ‘blocking function’ enabled by the drive and installation set facilitates replacement of the positioner during operation.
Another new feature is the contact-free position detection which uses the giant magneto-resistance (GMR) principle and makes the measurements particularly resistant to magnetic field and temperature fluctuations. Since only one magnet is required, installation is quick and easy as the Sitrans VP300 has a travel distance of up to 150 millimetres and can be rotated by up to 120°.
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