Pepperl+Fuchs Blog

Inductive Proximity Sensor Range Accuracy

Posted by Patricia Stafford on Thu, Jul 25, 2013

Laser sharp from the start

Ever wonder how you can say with confidence that an inductive proximity sensor can detect a target between 1 mm, 8 mm, or even 12 mm away?  

It’s all about precision. In this case, the precision measurement starts while the inductive sensor is being manufactured—halfway through the assembly process, before the exposed circuit board is fully assembled and protected in its final housing.

Proximity sensor range accuracy

A display screen shows the circuit board inside the
laser trimmer machine, where all the magic happens.

During the construction process, the proximity sensor itself is being measured rather than doing the measuring. A laser trimmer is awaiting to fine tune each trimmable resistor to an exact customized value.

The resistor is a component inside the sensor. This component, fitted on a circuit board, determines the sensing distance. And while it’s true that the measuring range of an inductive sensor depends on the overall design of the sensor, the laser trimmer fine tunes that range.  

The laser beam makes microscopic cuts similar to etchings or engravings on the resistor. The resistor can be less than 1 mm in size. The number, depth, and placement of these cuts on the resistor determine the final measurement value of the sensor.

It all comes down to one laser-sharp point: Attention to detail right from the start leads to inductive sensor range accuracy you can count on.

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Topics: Inductive Sensors

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