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Sensor

senast uppdaterad 2012-09-07 . Med reservation för ev tryckfel.

Magnetgivare

NO, NC, CO(=vxl) & B(=bistabila)

Magnetic sensors make use of reed contacts operated by means of an
external magnetic field, generated by a permanent magnet (magnetic unit).

A wide range of reed contacts is available with different features in
terms of dimensions (standard or miniature), type (NO, NC, Changeover),
electrical and mechanical properties, covering a huge variety of
applications in the industrial filed.


The normally open (NO=slutande vid påverkan av magnet) reed contact is open at the rest while it closes as the magnet is approaching.

If the function is normally closed (NC=brytande vid påverkan av magnet), the contact is kept closed through a bias magnet placed near the glass bulb; the approach of the operating
magnet, of reverse polarity, causes the magnetic field cancellation and then
the contact opening. It occurs to take account of the minimum distance that should exist
between the bulb and the magnetic unit: its decrease causes the contact closing.
This minimum distance depends on used reed form and on the operating magnetic unit.

In Change-over (växlande vid påverkan av magnet) models, the NO and NC functions take place in the same glass bulb; thereby, when the operating magnet approaches or moves away, the contact position is changed from open to close condition and vice versa.

In bistable (B=bistabil) function an internal magnet pre-polarizes the contact reed,
without succeeding in closing it. By the approach of the magnet with same
polarity the magnetic field is intensified, causing the contact to get closed,
that lasts even when the operating magnet moves away from the influence area.
The contact opens again only once the magnet approaches with opposite
polarity to the steady maintenance field (fig. 2, 3, 4 and 5).

The bistable function can be carried out also with Change-over contacts,
giving the Change-over / bistable function.

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