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Dual redundant output rotary position sensor for safety critical systems

16 April 2010

Penny + Giles has introduced the SRH220DR, a dual redundant output contactless rotary position sensor based on proven, non-contact programmable Hall-effect technology and providing reliable and accurate rotary measurement in extreme industrial and off-highway environments. 

This new sensor, with a choice of integrated 6-way connectors, provides numerous programmable options. Designed for operation in extreme temperatures, the SRH220DR enables system designers to quickly and easily improve the safety and integrity of their control systems by using the dual independent power supply and output signals, allowing compliance with SIL-2 requirements for systematic safety as defined in IEC 61508.

Penny + Giles’ configurable SRH220DR provides OEMs with a wide selection of parameter options including measurement range, and clockwise or anticlockwise direction output. This flexibility provides OEMs with a greater amount of control to configure the sensor to best suit their needs and achieve maximum performance.

Unlike conventional shaft-operated rotary position sensors, the SRH220DR has an integrated shaft and magnet assembly that activates the Hall-effect sensor through a hermetically sealed chamber.  This allows the sensor to be used in extreme environments that are subjected to high shock and vibration, and endure immersion in fluids for short periods (IP68 protected).

The sensor’s moulded housing includes a crush-proof mounting flange detail which has stainless steel inserts, allowing fitting and re-fitting of the sensor without damage to the flange. The housing also includes a choice of integrated 6-way connectors compatible with AMP Superseal 1.5 or Deutsch DT06 profiles. 

The SRH220DR can operate from either a 5Vdc regulated or 9-30Vdc unregulated power supply and has over-voltage protection to 40Vdc.  Each of its output channels can be supplied programmed with any one of 341 different angles in the range 0-20 to 0-360 degrees, in one degree increments, and features a 12-bit resolution (0.025%) over the selected angular range.

To ease configuration, SRH220DR can be factory-configured with either analog (0.5 to 4.5Vdc) or digital (Pulse Width Modulated) signal outputs as standard. It can also be factory programmed to offer 0.1 to 4.9Vdc output range, matching the equivalent signals from a potentiometer. The SRH220DR’s two outputs can be used for error checking if they are set up to be opposed (clockwise on the first signal and anticlockwise on the second signal) and the output summed.

SRH220DR features electromagnetic immunity to 100V/m and it has a very low maximum output signal noise of less than 1mV.  This means that no additional signal filtering is required on the output signal. It also has a class-leading non-linearity of ±0.4%.  When powered with 5Vdc, the SRH220DR has an operating temperature range from -40 to +140ºC, with a stability of less than ±30ppm/ºC.  An optional lever arm kit can be supplied, where installations require this feature.

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