Interconnection of the hall sensor (revised and posted on 15/03/12)

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The hall sensor Honeywell SS443A has an open collector output. This is intended for connection to a TTL/CMOS circuit – the 10kΩ pull-up resistor is already on the board. In this case no further circuitry is necessary.

In our test facilities, we like to apply the output to a 24V controller (e.g. PLC). This can be for example implemented by the following circuit with optocoupler module. The components have to be adapted to the respective load accordingly: