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nductive sensors
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Inductive sensors for the contactless detection of metal objects
Baumer inductive proximity switches are non-contact electronic sensors. Inductive sensors will recognize any conducting met

The oscillator creates a high frequency electromagnetic field, which radiates from the sensing face of the switch. When a conductive metal object enters this electromagnetic field, eddy currents are induced within the metal, causing a change in the amplitude of the oscillations. The result is a voltage change at the output of the oscillator, which causes the trigger to change state and alter the output state.

Output

Digitally switching sensors are available with a PNP, NPN or Namur output; measuring sensors come with 0 … 10 V or 4 ... 20 mA.

Series switching

3-wire DC (PNP circuit shown)

The voltage drop across each conducting sensor reduces the voltage available to drive the load. The number of proximity switches which can be connected in series is therefore limited and may be worked out by summing the individual voltage drops plus the load requirement.


 
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