Pool Arduino controller to read pH, ORP and temperature

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Teapot
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My Pool: 12 x 24 (45m3) liner pool, Triton TR60 filter with AFM glass media (Activate) and variable speed pump running 0.08HP
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Re: Pool Arduino controller to read pH, ORP and temperature

Postby Teapot » Sat 20 Jan, 2018 07:04

Ah, it's much easier to get things set up without the interference of CYA. If your gut feeling is the sensor, then you are most probably correct. I and others bought some of the cheapo's from Ebay which do work after a fashion but soon go completely off. I think they are meant for non chlorinated water maybe fish aquariums.


paulr33
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My Pool: Fibreglass Salt Water Pool, 45k litres
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Re: Pool Arduino controller to read pH, ORP and temperature

Postby paulr33 » Sat 20 Jan, 2018 19:58

yeah ill go for a replacement sensor, i had it working at home when i first got the sensor as i remember testing the code etc so yeah its damaged i would say.
the sensor is $190 AUD as its rated to ~100psi and industrial rated hence the added cost. their lab sensor is about $70 AUD but I figure im going to get a few years out of this sensor so may as well do it properly
paulr33
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Re: Pool Arduino controller to read pH, ORP and temperature

Postby paulr33 » Wed 24 Jan, 2018 05:47

replacement ORP sensor on the way, should have it next week
paulr33
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Re: Pool Arduino controller to read pH, ORP and temperature

Postby paulr33 » Thu 01 Feb, 2018 05:03

new ORP sesnsor arrived and all good, installed and working, pool water is 680mv at first sample
will get a weeks worth of data plot it up
paulr33
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Re: Pool Arduino controller to read pH, ORP and temperature

Postby paulr33 » Thu 01 Feb, 2018 05:53

some initial data from pH and temperature

you can see our solar heating works wonders when the sun is heat, no problems running it around 28deg and maintaining that level. perfect for all day swimming with kids
temperature.png


we had an awful amount of rain on the 28th of JAN and it's skewed out the pH a bit
you can also see the daily effects of the salt water chlorinator slowly increasiong the pH day by day
PH.png


the reason for the pH staircase chart is because i cant sample pH while the pump is running at it skews the data it captures. the vendor reports pH and ORP should not be sampled while pumps are running. so my pump runs from 10am to 4pm so i sample pH for a window of 1 hour so thats why it looks like a staircase. this is fine for my appication as im more interested in the weekly trend as opposed to the daily value
paulr33
Pool Care Proficient
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Posts: 40
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My Pool: Fibreglass Salt Water Pool, 45k litres
Location: Melbourne, AU

Re: Pool Arduino controller to read pH, ORP and temperature

Postby paulr33 » Thu 01 Feb, 2018 05:59

i have the opposite problem for the water temp sensor, i can only sample that reliably when the pump is running otherwise because of where the sensor is, it gets skewed by the air temp and temp of the water in the pipework, no where near the pool. so i made some code changes to;

plot temperature during pump run cycle - 10am to 4pm
plot pH 1 hour after pump stops - 4pm to 5pm
plot ORP at 11pm at night after 5 minute pump run to get fresh pool water from pool
Teapot
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My Pool: 12 x 24 (45m3) liner pool, Triton TR60 filter with AFM glass media (Activate) and variable speed pump running 0.08HP
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Re: Pool Arduino controller to read pH, ORP and temperature

Postby Teapot » Thu 01 Feb, 2018 11:50

Good stuff Paul, nice to see the ORP up near where it should be. That pH spike at 7.95 ish. If you bring down your alkalinity closer to 40-50 buy adding acid and then aerating to raise the ph back up and repeating until you have a lower alk figure you won't spike so easily. We don't need that much alkalinity, the pool water is still super saturated at 40ppm with bicarbonates at least 7x more in the water than the air but it will reduce the speed of the rise.
paulr33
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Re: Pool Arduino controller to read pH, ORP and temperature

Postby paulr33 » Tue 06 Feb, 2018 04:00

some initial ORP data
i had a look at the commerical PH and ORP sensor for my chlorinator is about $1000 AUD and the sensors and arduino i got cost me about $400 and i dont have to worry about the system making the pump run flat out if it cant get a magical ORP reading so i much prefer this way.
paulr33
Pool Care Proficient
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Posts: 40
Joined: Wed 03 Jan, 2018 18:53
My Pool: Fibreglass Salt Water Pool, 45k litres
Location: Melbourne, AU

Re: Pool Arduino controller to read pH, ORP and temperature

Postby paulr33 » Tue 06 Feb, 2018 04:03

ORP
ORP.png
Teapot
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My Pool: 12 x 24 (45m3) liner pool, Triton TR60 filter with AFM glass media (Activate) and variable speed pump running 0.08HP
Location: UK

Re: Pool Arduino controller to read pH, ORP and temperature

Postby Teapot » Tue 06 Feb, 2018 04:49

That's looking better Paul, later on when it settles in I would like to know how much the strong sun has an effect on the ORP. Can you link the pump Doser up to see how often it runs?

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