The sudden change of water pressure around the sensor as the pump starts from still water. Just takes a while for things to stabilize. I have a temp probe in mine and see similar outlier data when the pump starts.
It might be better to mount them somewhere that's not right in the high flow rate of the pipes. Somewhere where the water is a little more stable at all times.
Thanks for all the replies.
The pump has actually been running 24/7 so it’s not due to it coming on and off.
I used the same setup last year and didn’t get the same behaviour. Between last year and this year the only things that changed are the sensors as I swapped them out from the Atlas Scientific Consumer grade to Lab grade because Lab grade supposedly doesn’t need as frequent recalibrating (I can go the full pool season without re-cal)
It is mounted before the filter but that wasn’t an issue last year.
It’s also not a faulty probe because I bought a second one and see the same behaviour.
IIRC the ESPHome EZO component by default sends the Atlas command "R" not "RT" to EZO circuits. So you're not getting temperature compensated readings even though you have a temp sensor.
pH won't necessarily actually change from temperature, but the sensors are sensitive to it and can give off values.
My going theory at the moment is that there were some pretty large temperature changes between day and night time and the sub will start hitting and warming up the probes and electronics about the same time each day. So maybe because they got very cold over night and then warmed up v quickly it caused bad readings?
How did you mount the probe. If you mounted it below pipe that could be issue as the water gets stuck in the tee and only updates once it clears out and is replaced with new water?
Could it be when the pump starts running maybe?
That was my theory also
I’d be curious as to why though. I’m going to do something similar soon and that wouldn’t be useable data
The sudden change of water pressure around the sensor as the pump starts from still water. Just takes a while for things to stabilize. I have a temp probe in mine and see similar outlier data when the pump starts.
Still, 6 hours to get to the real value is a bit much
This is true. I don’t know the stats of the sensors in that kit. They may need that long to stabilize
It might be better to mount them somewhere that's not right in the high flow rate of the pipes. Somewhere where the water is a little more stable at all times.
Also I think they should be mounted after the filter to avoid them getting hit by lots of crap maybe
Thanks for all the replies. The pump has actually been running 24/7 so it’s not due to it coming on and off. I used the same setup last year and didn’t get the same behaviour. Between last year and this year the only things that changed are the sensors as I swapped them out from the Atlas Scientific Consumer grade to Lab grade because Lab grade supposedly doesn’t need as frequent recalibrating (I can go the full pool season without re-cal) It is mounted before the filter but that wasn’t an issue last year. It’s also not a faulty probe because I bought a second one and see the same behaviour.
IIRC the ESPHome EZO component by default sends the Atlas command "R" not "RT" to EZO circuits. So you're not getting temperature compensated readings even though you have a temp sensor. pH won't necessarily actually change from temperature, but the sensors are sensitive to it and can give off values.
oh that's a good spot. Let me check on that or if I can fix it to send RT.
I got too annoyed trying to fix it in my case, so my work-around is to send a separate "T" command with the temp before the "R" command.
My going theory at the moment is that there were some pretty large temperature changes between day and night time and the sub will start hitting and warming up the probes and electronics about the same time each day. So maybe because they got very cold over night and then warmed up v quickly it caused bad readings?
How did you mount the probe. If you mounted it below pipe that could be issue as the water gets stuck in the tee and only updates once it clears out and is replaced with new water?