How to calibrate my ph meter?
Planted Tank Forums
Your Tanks Image Hosting *Tank Tracker * Plant Profiles Fish Profiles Planted Tank Guide Photo Gallery Articles

Go Back   The Planted Tank Forum > Specific Aspects of a Planted Tank > Fertilizers and Water Parameters


Reply
 
Thread Tools Display Modes
Old 11-24-2012, 03:04 PM   #1
D-raw
Algae Grower
 
PTrader: (0/0%)
Join Date: Oct 2012
Location: Connecticut
Posts: 46
Default

How to calibrate my ph meter?


I just bought a digital ph meter. It came with

6.86 powder and
4.00 powder

I mixed two solutions. One with 1/4 cup of tap water and 6.86 solution and one with 1/4 cup 4.00 solution.

When I place my meter in the 6.86 ph water, I calibrated it so it's around 6.85

But when I place it into the 4.00 ph solution, it reads 4.3. I'm stuck on how to calibrate it.

I tested it In my fish tank with 7 ph tap water buffered by Amazonia new and it reads less than 6 ph. Something's wrong. I know the ph should be around 6.5 that's what my liquid ph tester reads. So the meter is calibrated low. But eve if I crank it up, the 4.0 solution and 6.86 will be too high. What do I do?
D-raw is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 11-24-2012, 03:07 PM   #2
Centromochlus
Honeycomb Master
 
Centromochlus's Avatar
 
PTrader: (116/100%)
Join Date: May 2008
Location: Phoenix/Flagstaff, AZ
Posts: 6,637
Default

There should be two places to adjust the high and and low end separately. What type of pH meter is it?
__________________
Centromochlus is online now   Reply With Quote
Old 11-24-2012, 07:57 PM   #3
Darkblade48
Moderator
 
Darkblade48's Avatar
 
PTrader: (3/100%)
Join Date: Jan 2008
Location: Toronto
Posts: 9,104
Default

What pH probe do you have? Is it a one point or two point calibration probe?
__________________
Anthony

A Primer to Pressurized CO2 and A Primer to Planted Tanks
Eheim Pimp #362 - Eheim 2213 x2, Eheim 2028, Eheim 2217, Eheim surface skimmer and Eheim autofeeder.
Victor Pimp #33 - HPT272-125-350-4M
Darkblade48 is offline   Reply With Quote
Old 11-24-2012, 08:22 PM   #4
D-raw
Algae Grower
 
PTrader: (0/0%)
Join Date: Oct 2012
Location: Connecticut
Posts: 46
Default

It's the one probe in the back. It's a yellow one I got off eBay
D-raw is offline   Reply With Quote
Old 11-25-2012, 12:18 AM   #5
bobc4d
Algae Grower
 
PTrader: (0/0%)
Join Date: Sep 2012
Location: b/cs texas
Posts: 55
Default

idealy you should use DI water to mix the solution, which has most chemicals removed and is usually 7.0 pH (neutral) because you are using tap water it is changing the value of the pH solution. you could use a pH buffer to help with using tap water

at work I have a Hach pH meter and do a 3 point pH calibration using pH standard solution of 7, 4 and 10.
bobc4d is offline   Reply With Quote
Old 11-25-2012, 12:22 AM   #6
Darkblade48
Moderator
 
Darkblade48's Avatar
 
PTrader: (3/100%)
Join Date: Jan 2008
Location: Toronto
Posts: 9,104
Default

Quote:
Originally Posted by D-raw View Post
It's the one probe in the back. It's a yellow one I got off eBay
I'm not sure which model/make this is....

I suppose if it was a cheap pH probe, it'd only be a one point calibration
__________________
Anthony

A Primer to Pressurized CO2 and A Primer to Planted Tanks
Eheim Pimp #362 - Eheim 2213 x2, Eheim 2028, Eheim 2217, Eheim surface skimmer and Eheim autofeeder.
Victor Pimp #33 - HPT272-125-350-4M
Darkblade48 is offline   Reply With Quote
Old 11-25-2012, 02:25 PM   #7
D-raw
Algae Grower
 
PTrader: (0/0%)
Join Date: Oct 2012
Location: Connecticut
Posts: 46
Default

So should I use distilled water the one I buy in jugs at stores and just use that as a 7ph calibration?
D-raw is offline   Reply With Quote
Old 11-25-2012, 03:08 PM   #8
Rev_jim_jones
Planted Member
 
Rev_jim_jones's Avatar
 
PTrader: (1/100%)
Join Date: Sep 2011
Location: Mays Landing, NJ
Posts: 160
Default

Well if it is the same cheap one I got from Ebay then you need to buy a different brand of calibration fluid/powder. The one i received where PH 7.01 (was actually 7.72 with RO water). And yes it is single point calibration.
Rev_jim_jones is offline   Reply With Quote
Old 11-25-2012, 04:56 PM   #9
D-raw
Algae Grower
 
PTrader: (0/0%)
Join Date: Oct 2012
Location: Connecticut
Posts: 46
Default

Can someone link me to the powder I need to get
D-raw is offline   Reply With Quote
Old 11-25-2012, 05:11 PM   #10
Diana
Planted Tank Guru
 
PTrader: (0/0%)
Join Date: Jan 2010
Location: Contra Costa CA
Posts: 6,950
Default

Using the powder it came with, did you mix these powders with RO or distilled water?

You ought to be able to use RO or distilled as a 3rd reference, but if either of these are exposed to the air they can pick up CO2 and the pH of this will be lower. No way of telling.
Diana is offline   Reply With Quote
Old 11-26-2012, 01:23 AM   #11
bobc4d
Algae Grower
 
PTrader: (0/0%)
Join Date: Sep 2012
Location: b/cs texas
Posts: 55
Default

for work we use hach.com, you can call them and talk to the techs, tell them what you have and need for, they can direct you to what you need.
bobc4d is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 07:41 PM.


Powered by vBulletin®
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright Planted Tank LLC 2012