I am trying to design circuitry to connect 4 separate float-less water level controllers into one probe. Each unit needs to confirm that there is water in the tank and if not, will shut down. Not all units are necessarily running at the same time. Each unit uses a Omron 61F-GP-N float-less level controller (https://www.ia.omron.com/data_pdf/cat/61f-gp-n__ds_e_7_3_csm6.pdf) that connects to a probe in a tank of water. The output from each Omron level controller is 8 Volts AC and under 1 mA. If there in continuity through the water, then the units know that there is water in the tank. If I connect all units to the probe, they backfeed and don't recognize when the water level drops. Will it be as simple as putting a bridge rectifier in each connection before they link together at the probe? If so, what would be suitable bridge rectifiers? What design of bridge rectifiers and diodes would get me what I want?
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