Multiple 8V AC connections to one

[Minnikin]

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?

 

[danadak]

The output is :

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Your 8V 1 mA is to the probe itself.

If you truly want the output of any activated, wire all 4 NC contacts in series (not the power
switching contacts, the stand alone contacts), and when any one opens you have a tank issue......


Regards, Dana.

 

[Minnikin]

The output is :

View attachment 63317

---

Your 8V 1 mA is to the probe itself.

If you truly want the output of any activated, wire all 4 NC contacts in series (not the power
switching contacts, the stand alone contacts), and when any one opens you have a tank issue......


Regards, Dana.

Thanks for your input Dana. I might give that a try. I can't get my head around the theory since each unit is pushing the 8V AC out, but I can try it.

 

[Delta Prime]

I can't get my head around the theory since each unit is pushing the 8V AC out

That's because you have a preconceived solution.

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?

No, no and no.

 

[Minnikin]

That's because you have a preconceived solution.

No, no and no.

Thanks Delta Prime, but do you have any helpful suggestions? And the purpose of my question is to find a solution. Dana suggested one, but are you saying no to that as well?

 

[Harald Kapp]

@Delta Prime : Just saying "no" doesn't help the op in solving the issue.

As @danadak noted the 8 V is the supply voltage for the sensor. You connect each set of sensors to a dedicated control unit.
Each unit has 2 relay outputs (pins 1, 10, 11 and pins 6, 7 8):

You use these relay contacts to operate e.g. a pump, oa solenoid or simply an indicator lamp. The manual shows sample circuits for different application like this one:

The relay contacts of 4 controller units can be used in basically two ways:

1. connect the normally open relay outputs in parallel (logic OR). Then the output will be active if any of the controllers activates the output (closes the contact).
2. connect the normally closed relay outputs in series (logic AND). Then the output will be inactive if any of the controllers activates the output (opens the contact).

 

[Delta Prime]

Thanks Delta Prime, but do you have any helpful suggestions?

No.

Dana suggested one, but are you saying no to that as well?

No.