Temposonics linear-position sensors use the time-based magnetostrictive position sensing principle developed by Temposonics. Within the sensing element, a sonic-strain pulse is induced in a specially designed magnetostrictive waveguide by the momentary interaction of two magnetic fields. One field comes from a movable permanent magnet that passes along the outside of the sensor. The other field comes from an “interrogation” current pulse applied along the waveguide. The resulting strain pulse travels at sonic speed along the waveguide and is detected at the head of the sensing element.

The position of the magnet is determined with high precision and speed by accurately measuring the elapsed time between the application of the interrogation pulse and the arrival of the resulting strain pulse with a high-speed counter. The elapsed time measurement is directly proportional to the position of the permanent magnet and is an absolute value. Therefore, the sensor's output signal corresponds to absolute position, instead of incremental, and never requires recalibration or re-homing after a power loss. Absolute, non-contact sensing eliminates wear, and guarantees the best durability and output repeatability.

Temposonics continues to establish new performance standards for low-cost, fully-industrial, durable position sensors using the widely preferred magnetostrictive technology. This principle for accurate and non-contact measurement of linear-position sensing was developed 30 years ago by Temposonics and is used with outstanding success in a large variety of industrial applications.

The innovative Temposonics model ER sensor brings proven benefits of magnetostrictive feedback to the versatile rod-and-cylinder sensor package.

It is ideal for demanding industrial applications where high performance non-contact feedback is essential for maximum productivity and overall reliability. The model ER sensor’s rod-and-cylinder design has a rod that can extend from the sensor housing. As the rod is extended and retracted, the sensing magnet remains completely contained and protected at all times, ensuring reliable sensor performance in the toughest industrial environments.