Digital position readouts from BW Electronics

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The Micro Position Sensor 2

The Micro Position Sensor 2 (MPS2) combines the best in modern electronics with a miniature position sensor to give a complete digital position readout in one tiny unit.

• The MPS2's robust die-cast aluminium enclosure is only 92mm wide, 38mm deep and 31mm high.
• The MPS2 is sealed to IP54 standards, and includes a PTFE seal at the measuring wire exit; this enables the MPS2 to be used in positions subject to collant and swarf.
• The MPS2 has a bright sign and five-digit 0.3" 7.6mm red LED display with anti-reflection filter, reading to ±999.99mm or 99.9995".
• The MPS2's measuring range is 500mm or 20"
• At the touch of a key, the MPS2 can display a position in inches or millimetres; it can also be set to power up in either inches or millimetres.
• The MPS2's display can be zeroed at any time by the zero key to set a datum point; the direction of movement for a positive distance reading can also be set.

The MPS2 is available with the measuring wire extending from any one of three sides. Looking at the display, these are the top, bottom and left sides. The wire emerges 4mm above the base of the MPS2.

How the sensor works

All the sensors from BW Electronics use a similar measuring method, based on an extending stranded stainless-steel wire, much like a tape measure. The measuring wire is wound around a small drum inside the sensor, which also has a restoring spring. As the wire is pulled out or returned under the spring tension, the wire winds off or on the drum. The drum has a thread cut on its outside diameter to ensure the wire winds cleanly on and off, with no overlapped turns. Attached to the drum is a rotary optical encoder that measures the rotation; signals from the encoder are counted to give the distance moved.

This method of measuring makes it particularly easy to fit sensors on smaller machine tools.

• The measuring wire has minimal cross-sectional area, so it can be squeezed into very restricted spaces.
• Being flexible, the wire can be taken around pulleys to change direction, avoid obstacles etc.

BW Electronics, 12 Mussons Close, Corby Glen, Grantham, Lincolnshire, NG33 4NY, Great Britain
Tel/fax: +44(0)1476-550826
e-mail: sales@bwelectronics.co.uk