ORP Probe Calibration

simonv92

Member
Hi all,
I'm running Reef-pi with great success. I have to calibrate the ORP probe with 1 value. How can I do that?
In ph tab Reef-pi always tells me about a 2 value calibration, but for the ORP I only have the 225mV calibration solution
Thank you very much!
Simone
 
Hi all,
I'm running Reef-pi with great success. I have to calibrate the ORP probe with 1 value. How can I do that?
In ph tab Reef-pi always tells me about a 2 value calibration, but for the ORP I only have the 225mV calibration solution
Thank you very much!
Simone
Hi Simone, unfortunately you won't be able to calibrate it in reef-pi. If you are using an Atlas circuit you can run their example code to calibrated it and the calibration will be stored on the circuit.
 
Unfortunately that circuit won't save the calibration. It is still possible to calibrate using another probe, when you do a 1 point calibration it simply shifts the pH value. If you type 7.5 as the calibration buffer you will get 7.5 after you save it. I think I miss understood, when you said 2 value I was thinking, I was thinking it wouldn't accept 2 as the value. I'm pretty sure reef-pi does 1 or 2 point calibration, maybe it's prompting you for 2nd point? It's been so long I can't remember the pH screen, can you post an image of it?
 
Thank you again Rob, this is the calibrate page:
Screenshot-2025-04-04-212649.png



I've tryed to calibrate it using only the mid-point but doesn't work..
 
Thank you again Rob, this is the calibrate page:
Screenshot-2025-04-04-212649.png



I've tryed to calibrate it using only the mid-point but doesn't work..
It kind of looks like it is calibrated. I see on the calibration popup you have 25757 but on the chart I see 225.00. I'm guessing you used 225mV calibration solution. That's what I would expect to see, the calibration popup always shows the raw value which can be confusing.
 
Thanks Rob, I was also thinking it was calibrated but the graph consistently shows me 225mV so something is wrong. I entered 225 on both boxes of the calibration window. Maybe I should have just used the top one...
 
Thanks Rob, I was also thinking it was calibrated but the graph consistently shows me 225mV so something is wrong. I entered 225 on both boxes of the calibration window. Maybe I should have just used the top one...
I think that's what would happen if you use both, did you try just the top field?
 
I'll try :) If I'll try to use the Atlas Scientific EZO circuit (I already have the Ph one from an old project) can I read both ORP and Ph using the EZO driver in Reef-Pi?
Yeah there's no limit on how many times you can use the EZO driver, by default the ORP uses address 98 and the PH address 99.
 
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