Reef Angel Forum

I have been getting ph alerts that say I am above my alarm level but when I check the app or the datalog at home and it reports that it is normal. Any idea what causes this? I used my existing ph probe when I setup the RA. It is only 4 or 5 months old.

As an example I got a text that said PH was 6.83 just now but my banner shows 6.56.

Any insight would be helpful.

Thanks!

-Mark

What are you using to get the alerts?

The reef angel monitoring software. I have it running on one of my servers.

Is it only on the pH??
Does the graph have any spike?

Yea its showing spikes. I might try replacing the probe. The spikes seem intermittent.

I get similar spikes. I have replaced both the probe and the controller board itself but it made no difference.

Eventually I replaced one of my ATO switches and it helped a lot, but they still happen.

I believe it has to do with the noisy electrical environment you get around pumps / heaters / etc. It helped me when I moved my probe from my sump to my overflow. They still happen, but less often.

Don

Would it be possible to write some code that ignores values outside of a range in a given amount of time?

Say PH is 6.5 but half a second later its at 6.8 and then back down to 6.5 in another half second. Its not possible to change the ph that fast so even if the sensor says it as such the data should be ignored.

pH is already smoothed out over 10 readings

When I first set it up I was getting them. I just set the alert value higher and it wasn't an issue till recently. The last 3 days I have gotten constant texts

Roberto if its smoothed out and still showing spikes is it possible that one or more readings is way high and therefor causing the burp even if they are smoothed. Would eliminating outliers improve the smoothing or does it already do this?

Curt had implemented that check on temp probes but not for pH.
It is true that if one is a really high spike, it would affect the average.
Can you check if the float switches are not interfering with the readings by introducing ground loop?
Check for any broken lead wires or possibly removing them to see if the spikes go away.

Float switches are not plugged in yet.

Problem was resolved.

Expansion hub had a bad wall wart that ended up causing the interference.