pH calibration

[jack]

Hi all,

I observe there are three kind of calibration fluids pH4.0, pH7.0 and pH9.0.
I read the ProfiLuxII manual and the manual point out the standard calibration at pH 4.0 and 7.0.
Now, I want to order calibration fluids for calibrate pH.
Should I order three kind of calibration fluids or I only need pH4.0 and pH7.0?
My tank is saltwater tank.

Thank you for your help.
Jack

[Micha578]

Hi!
You can use the calibration fluids 4, 7 or 9. You must use two of them and u can use the third to check the Profilux after calibration.

You can also set the Profilux to an other value, if you have a calibration fluid e.g. 6,5 or something.

[Chew]

For most accurate results you should use the 2 that are either side of the range you want to use the probe in. For example if you are using it to measure the pH of your marine tank then you will be measuring values around 8.2 and so use the 7 and 9 calibration solutions. If its for use in a calcium reactor then they normally run between a pH of 6 and 6.5 so use the 4 and 7 solutions.

[larryfl1]

speaking of calibration i have a question....

the manual says to dry the probe via air... if i let the probe sit out and dry will that damage it?

do we need to dry it?

then the other question..does everyone pour some calibration solution in seperate cups not to conatiminate? should i rinse with di water inbetween and let dry again?

[Coralleida]

The best way to calibrate:

1. Rinse the probe with osmotic water
2. Let ir dry (air or using a smooth paper)
3. Pour on a little of the first calibration fluid in a clean recipient
4. Calibrate the first value
5. Rinse again the probe with osmotic water
6. Pour on a little of the second calibration fluid in a clean recipient
7. Let it dry again
8. Calibrate the second calue
9. Clean carefully both recipients you've been using, and keep them dry
10. Do not use again the fluids you've used to avoid errors or contamination