| 摘要 |
An inductive proximity switch having a coil situated to the rear of an "active" housing wall and belonging to a receiver circuit, whose signal changes as a metallic object approaches, the coil being operatively connected to a switching amplifier which changes its switching state when the object reaches a predetermined distance. In order to reduce the influence on the switching distance of any covering of the active surface with welding dust, there is a supplementary sensor, associated with the "active" housing wall (2), to provide electronic compensation for changes in the receiver signals produced by metallic deposits, especially ferritic deposits, on the "active" housing wall (2).
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