Return to the Hydroponics Forum | Post a Follow-Up

 o
Hanna pH tester problem

Posted by floridabobx (My Page) on
Fri, Jul 4, 08 at 10:42

Hello,

I recently attempted to upgrade from litmus paper to a meter for pH testing, but I'm having some trouble. I bought a HANNA 98108 pHep+.

I strictly followed all package instructions upon opening it, including letting it sit in pH 7.01 solution for 2 hours to activate the electrode.

However, it seems impossible to calibrate. After calibrating with 7.01 and 4.01 solution, within a minute it is off again, generally by a lot. When compared with the results of litmus paper, it is usually off by at least a full point immediately after calibration, but it varies greatly. When left to sit in 7.01 calibration solution, the reading slowly slides until after several minutes it may be up or down several points.

Am I missing something? Did I just get a bad unit?


Follow-Up Postings:

 o
RE: Hanna pH tester problem

Sounds like your probe is faulty. I suggest you get back to your supplier. Hanna is a good make. I'm sure they'll fix the problem.


 o
RE: Hanna pH tester problem

Yep, I agree with greystoke here. If your meter's reading drifts while sitting in the same solution there's something wrong with either the probe or the meter.

Talk to Hanna and see what they want to do to fix it.


 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!


Return to the Hydroponics Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Please review our Rules of Play before posting.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.


Learn more about in-text links on this page here