Fault signalling circuit

Fault signalling circuit: The present circuit was developed to make it possible for different sensors to be added to an existing alarm installation. These sensors may be gas or smoke detectors, door switches, 1 infra-red detectors, and others. In quiescent operation, the level at all 44 inputs must be zero. When the relevant sensor is[…]

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Inductive proximity switch

Inductive proximity switches are used for instance for measuring motor speeds or determining the position of metal objects. They do not suffer from mechanical wear or contacts that spark. The latter is particularly important in spaces where explosive materials are stored. Virtually all commercial proximity switches are constructed as shown in fig 1. An inductor[…]

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