PDA

View Full Version : When calibrating my pH probe...


srusso
08/27/2012, 06:09 PM
I am following the unofficial guide it says when calibrating 7.0 pH the number should read in the 700's. When I was calibrating mine it only dropped to 814, and now all readings seem low. Is it ok, should I try again? Do I need a new probe?

tronyony
08/27/2012, 06:27 PM
Mine did that not 15 min ago when I calibrated mine. I pulled the probe out cleaned it, shook the solution and put it back in. It got down to 7.24. Called it good. repeated the steps with the 10.0 solution. stuck probe in tank and it read 7.82. Added some 8.2 Ph buffer and the display is reading 8.17.

Tony

srusso
08/27/2012, 06:46 PM
Mine did that not 15 min ago when I calibrated mine. I pulled the probe out cleaned it, shook the solution and put it back in. It got down to 7.24. Called it good. repeated the steps with the 10.0 solution. stuck probe in tank and it read 7.82. Added some 8.2 Ph buffer and the display is reading 8.17.

Tony

I cleaned it before this calibration also, maybe I will go back and give it a better cleaning...

tronyony
08/27/2012, 06:50 PM
I cleaned it before this calibration also, maybe I will go back and give it a better cleaning...

I really didnt go crazy with the cleaning. When It stopped dropping I shook the solution again. Probably about 3 times I did that. When it stopped droppen and stayed I said guess thats close enough. Switched to the 10.0 and did the same thing.


Tony

tronyony
08/27/2012, 06:54 PM
My Ph after close to an Hr of adding the 8.2 Ph buffer


Tony

srusso
08/27/2012, 07:52 PM
My Ph after close to an Hr of adding the 8.2 Ph buffer


Tony

:hmm4: Your tank is kind of warm... no?

tronyony
08/27/2012, 08:22 PM
:hmm4: Your tank is kind of warm... no?

Its actually where I like it. I used to keep it at 79 . At 84 every thing is groovy

srusso
08/27/2012, 08:35 PM
Its actually where I like it. I used to keep it at 79 . At 84 every thing is groovy

Really, that's interesting... You learn new things all the time with this hobby! You have a thread on it?

tronyony
08/27/2012, 08:45 PM
No sir. Just my own experience. My coral don't mind the temp and my fish are cool withi it too.


Tony

HeneryH
08/28/2012, 09:17 AM
Don't read too much into the displayed value during the calibration. The value shown is really just a number related to the millivolts sensed on the port at each calibration point. It is only after the software applies a mathematical conversion that it displays the pH.

Best thing to do is follow the procedure then do a dip in your 7.0 and 10.0 solutions to check your final results.

srusso
08/28/2012, 10:00 AM
Don't read too much into the displayed value during the calibration. The value shown is really just a number related to the millivolts sensed on the port at each calibration point. It is only after the software applies a mathematical conversion that it displays the pH.

Best thing to do is follow the procedure then do a dip in your 7.0 and 10.0 solutions to check your final results.

That's what I did... followed instructions very carefully. Now I am reading rather low pH.... I guess I will got back to dripping kalk.

HeneryH
08/28/2012, 10:05 AM
Did your readings show very close to 7.0 and 10.0 when dipped in the cal solution after the procedure?

srusso
08/28/2012, 01:07 PM
Did your readings show very close to 7.0 and 10.0 when dipped in the cal solution after the procedure?

I should have tried that... :hmm4:

tronyony
08/28/2012, 01:38 PM
Just a thought but when I first connected my probe I had it on the wrong port. plugged it into the Ph port instead of the Ph/Orp port and butter baby.


Tony

srusso
08/28/2012, 04:07 PM
Just a thought but when I first connected my probe I had it on the wrong port. plugged it into the Ph port instead of the Ph/Orp port and butter baby.


Tony

Yeah, have the ORP probe connected also. So I am connected to the right port. thank you

tronyony
08/28/2012, 04:14 PM
Rog. What's your reading on the Ph probe?

srusso
08/28/2012, 04:23 PM
201534

tronyony
08/28/2012, 04:42 PM
That's actually pretty close to what mine is. Temp plays a role in Ph from what I've read. Mine is 7.99 right now