Swimming Pool PH with Loxone

[Arnaud]

Good morning,

Has anyone ever managed to control the water quality of a swimming pool? (the PH), for the rest: filtration, temperature, lighting, closing - it seems to me to be a child's play.

After a lot of research I found no examples.

There are commercial solutions dedicated to swimming pools, or DIY systems based on Raspberry or Arduino.

What I would like is to have as little "intelligence" as possible between the PH probe and the Loxone system.

I can understand that an electronic circuit is needed to correctly interpret the data sent by the probe, but not a complete system, which would complicate the installation and increase the risk of malfunctions.

thank you for your experiences.

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[Kevp]

Hi,

I would look at a ph sensor from the commercial or industrial world, The diy units are not always for continuous sampling of water.

No matter what unit you choose they will need the probes replacing from time to time.

Most PH probes have a milli-volt output and there are plenty of analog converters out there that can convert a milli-volt signal to a 0-10v signal that can be fed to the Miniserver. 

[Deac99]

Thanks for asking the question - in about 4-5 years when my new home is completed I will have a winter garden where I want to grow hydroponic vegetable and herb plants in.  With hydroponics you have to monitor Ph, TDS, EC and PPM along with all the basics like you mentioned - I'll keep my eyes open to see if there are any meters that have outputs that could interface with Loxone.

[Arnaud]

Hello Kevp,

I know that, but without a concert example, it's still literature.

I am looking here for a sharing of experience, I know the theory as the majority of partners I think.

I'm trying to find out if someone has already done this type of configuration, with which converter (because I think that's the hot spot), how to connect it? need a separate power supply? 

which Loxone configuration to get the right information? present it correctly?

[Kevp]

Hi Arnaud,

I would be surprised if anyone on here has done it.

You may have to be the first to put theory into practice!


There shouldn't be anything too difficult with what you are trying to achieve especially since you know the theory.

I would recommend www.rswww.com to buy analogue converters from and each one should have a data sheet for the wiring diagrams.

Most converters can operate on 24vdc as its a fairly common voltage in industry for sensors and controls.


I had a quick look at PH sensors and transmitters. I think you can get them with a millivolts or a 4-20ma output.
Obviously it would be most helpful if you could find one with a 0-10v output.

If you cannot find a 0-10v transmitter then personally I would go with a 4-20ma Loop powered ph transmitter and a 4-20ma -> 0-10v analogue converter that can be mounted in the Loxone panel.

4-20ma is simple and only requires two wires from the transmitter to the converter and it is not affected by cable length like a millivolts signal would be.


For displaying in Loxone, I would just put in the correction factors on the 0-10v input so it displayed a ph reading. and then tick the use box.

Best regards

[Arnaud]

hi

thank you for these informations, i'll take a look.

i didn't know that 4-20ma wasn't affected by cable lenght for example.

my job is initially IT networks so i've many thing to learn in electronic.