Magnetostrictive linear position sensors have a number of attractive features that distinguish their fit in the position sensing marketplace. The first is that they offer superior precision and reproducibility, often in the range of 0.001% across the measured depths. This high precision is unaffected by changes in time and temperature thus providing consistent measurement in any operating condition. The contact-free operation prevents mechanical wear and ensures low maintenance, as well as long service life of the sensor. These sensors are designed for absolute position measurement and do not require a reference run or use a start-up procedure to “find” a reference position but rather immediately provides the actual position without the need for additional acquisition time. They are so tough that they can withstand almost anything, such as shock, vibration, and environmental extremes from dust and moisture to reaching temperatures of 70C to dropping to almost -40C. The resolution of sensors is also extremely good, sometimes in the micrometer range, so they can be used in precision applications. They run at high speeds, issuing position feedback in real time with low latency. The system’s natural electromagnetic immunity allows for reliable operation in electrically noisy industrial areas. These sensors also offer flexibility in that they are capable of measuring a position over long distances while still providing accuracy across the entire range of travel. Their output signals are easily compatible with many control systems, and can be interfaced in several forms such as, analog, digital and industrial fieldbus. Their reliable and maintenance-free operation and long life make them an economical solution for long-term industrial use.
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