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Pepperl+Fuchs Blog

What Makes a PMI Inductive Sensor Better than a Cylindrical Sensor?

Posted by David Rubinski on Thu, May 29, 2014

Why would someone choose a PMI analog inductive sensor over an analog cylindrical inductive sensor?

Choosing a PMI Inductive SensorThe PMI analog inductive sensor offers some real advantages over an analog cylindrical inductive sensor. Among these advantages are improved linearity and longer analog measurement range.

For example, an analog cylindrical sensor may typically have 5 mm … 10 mm of sensing range. Linearity is reduced as the target moves farther from the sensor face (full scale accuracy: +/-4%, +/-0.2 mm, distance 5 mm) and the linear range is not expandable by the single coil sensing technology.

Analog cylindrical sensor

Alternatively, the PMI sensors have a multi-coil technology, which allows them to have consistent linearity over the complete range because the target never moves farther away from the sensor’s measurement coils.

Here are two examples, one with a PMI14V-F112-U-V3 (+/-0.3 mm linearity, distance 14 mm) and one with a PMI40-F90-U-V15 (+/-0.4 mm linearity, distance 40 mm).

PMI inductive sensorThe PMI40-F90-I-V15 allows for even more linear sensing range. With a range of 40 mm, it provides an ideal analog measurement distance for many applications.

Linear sensing rangeQuestions about Inductive Sensors?  Get the Quick Select Product Guide

Topics: Inductive Sensors

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