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Can you wire 3 wire type sensors in series?

You can do this however the following points should be considered.

Each sensor, when conducting will produce a voltage drop of 2.6 volts each.

Sensor 1, when conducting its load current, will also carry the leakage currents of all other sensors.

Sensor #2 is only powered when sensor #1 is turns on. Only after its power up delay will sensors 2 be able to function properly. This delay should be taken into consideration when speed is a factor.

And last: Use of a flywheel diode is recommended where a inductive load is being switches.

For this information see Sensors Catalog 9007CT0101page 362.

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