[Solved] PZ-829 RC and PZM-20 rainwater tank controllers - questions and concerns

Hello, I own a rainwater tank for watering the garden.

The watering is controlled by a rainbird controller.

The controller is connected to a contactor which runs the pump.

I need a controller that will protect the pump from running dry (minimum level). It will pump water up to the maximum level ( when the rainbird runs out, watering can run). The controller will give voltage to a 230/24 transformer and this will activate an electro-valve which will fill the tank.

I found a PZ-829 RC controller, but unfortunately either I am doing something wrong or there is no possibility to start pumping immediately after the water drops below the maximum level.

In theory, the solution to my problem turned out to be the PZM-20 controller, everything worked as long as there was city water in the tank, unfortunately with rainwater the sensors do not work.

The whole control set should preferably be mounted on din rails.

The PZ-829RC should work fine for you after all it has two relay contacts from the max and min probe.
I understand that you want to start topping up when the water drops below the max level and turn off topping up when it reaches the max?

Yes, I want the topping up to start as soon as the water drops below the max. The PZ-829 starts pumping when it drops below the minimum and this creates an interruption in watering and the rainbird controller doesn't know there is no water so part of the garden will be unwatered.

To correct, this max level will be somewhere around the middle of the tank. The rest will be supplemented by rainwater

Added after 2 [minutes]:

There is also the possibility that I am wiring something wrong, I have the controller on the table so I can test the proposal on the fly.

Well then mate you are simply connecting the control to the wrong contacts.
You must use the Rmax contacts

The max and min pins work the same way, so if I have a short on max pins between 7-8 then on min I have a short on 10-11, if it changes 8-9 then on min 11-12. Unless my controller is just faulty?

In the picture below, max probe pulled out, short on pins 7-8 and 10-11. Inserting pull out probe doesn't change anything.

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Only after pulling out the minimum probe does the controller switch to minimum mode. Then I insert the minimum after it max and then the controller switches to max mode.

How does the controller behave when all the probes are removed from the water ?

Diode changes to minimum, short circuit on pins 8-9 and 11-12

Added after 6 [minutes]:

Looking at the diagram below I find that the controller works as intended by the manufacturer. Apparently I need a different solution.

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Well, just place the minimum probe at the level at which you want the topping up to be activated and the maximum at the level of the full tank, unless I still don't understand something.

The idea is that for the time it takes to fill the tank from minimum to maximum level, the pump will be switched off. I am keen to keep the pump intervals as short as possible.

I would like the minimum level to be the level that protects the pump from running dry and to protect the pump from this controller too.

And the filling is started as soon as it falls below the max. level, so that the pump is not interrupted.

I understand that the PZM-20 met your expectations but does not work if you have rainwater ?
And the sensitivity adjustment did not help for rainwater ?

Adjustment unfortunately didn't help, clean water everything worked, dirty sensitivity to the max and nothing.

Or do you have to do it on ordinary floats ?
e.g. https://telmatik.pl/project/czujniki-poziomu-cieczy/

I would like it to be on probes like the pz-829, I saw such a solution at a customer some time ago. I think it's all a matter of finding the right controller.

You might as well try to remake this zamel.

Added after 4 [minutes]:

Or something like this:
https://www.youtube.com/watch?v=uGw6G1PzpUI

I solved the problem by mounting two C61F-GP controllers