SMART Position Sensor, 75 mm and 225 mm

Honeywell Sensing and Productivity Solutions SMART position sensor, with either a 75 mm or 225 mm linear configuration, is a non-contacting sensing solution for linear absolute position sensing with enhanced speed and accuracy. It senses the position of a magnet relative to the sensor from 0 mm to 75 mm [0" to 3.0"] or from 0 mm to 225 mm (0" to 8.86").

Why is the SMART position sensor smart? SMART means that this is a sensor that can essentially think for itself. The SMART position sensor has the ability to self-calibrate, because it uses a patented combination of an ASIC (Application-Specific Integrated Circuit) and an array of MR (magnetoresistive) sensors to accurately and reliably determine the position of a magnet attached to a moving object (e.g. elevator, valve, machinery, etc.) so that the object's position can be determined.

Overview

The MR array measures the output of the MR sensors mounted along the magnet's direction of travel. The output and the MR sensor sequence determine the nearest pair of MR sensors to the center of the magnet location. The output of these two MR sensors is then used to determine the position of the magnet between them.

With this sensor, Honeywell has utilized MR technology through the ASIC at a level never before accomplished.