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Discussion Starter #1
Good morning
I bought a used CO2 setup on another board. It had a Milwaukee regulator and pH controller.
Also included was Milwaukee #MA 9004 pH 4.01 buffer solution and Milwaukee pH 7.01 buffer solution.
On a whim I decided to check the KH on both using my API ;KH test kit.
Neither was at the right level. I gave up after 20 drops on the 4.01 solution.
I also have some home made 4KH solution that I bought from another member.
I tested that and it comes out at close to 4 KH. So I think my test kit is close to right.

Question: What is so different with the calibrating solutions that Milwaukee supplies that they won’t read on a test kit?
I also checked the pH using an API pH test kit and compared it to the reading on the pH controller. The readings are close to the same. 6.4 on both.
KH tests at 6 drops or 107.4 ppm.
Drop checker is a yellowish green in color.
Thanks in advance
Charles
 

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I am not sure what your questions is.

Why did you test the kH of a pH calibrating solutions?

If the pH of the 4.01 solution and 7.01 solution are incorrect (i.e. they both measure 6.4), then it could be that a) your pH calibrating solutions are old or b) your pH meter is quite off.

Also, I am not sure what the 6 dkH and the colour of a drop checker have to do with anything here.
 

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i think you're confused. the ph solutions are a known ph that you calibrate the ph probe to. so that when your ph probe is in your tank it can read what the ph is.

the only place that you need to have a known kh is in your drop checker. when you have 4dkh solution it will turn green when its at 30ppm co2.

look at this chart http://www.tropica.com/article_fullscreen.asp?type=aquaristic&id=445
if you have 6kh and a ph of 6.4 in your tank you have 77ppm of co2. thats too much.
with 6dkh you should set your ph monitor at 6.7.

yellow in your drop checker is too much co2. it should be green
 

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look at this chart http://www.tropica.com/article_fullscreen.asp?type=aquaristic&id=445
if you have 6kh and a ph of 6.4 in your tank you have 77ppm of co2. thats too much.
with 6dkh you should set your ph monitor at 6.7.
The CO2/kH/pH relationship can only hold true if there are no other buffers in the water that will affect the kH. Unfortunately, in the aquarium, there are other buffers that will affect this relationship, so measuring the pH and kH of your aquarium water is not a good measurement of the amount of CO2 in the water. As a result, setting the pH meter to (say) a value of 6.7 may not provide enough CO2.
 

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yeah, phosphates will throw that off. he can set his ph monitor to 6.7 and that would be a good place to start. he has a drop checker so he can adjust accordingly from there. but he def needs to back off of the co2 a bit for now.
 

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Discussion Starter #7
wow man. you kinda lost me. why are you checking the kh of the 4.01 or 7.01?
Am I wrong in assuming the 4.01 is s'posed to be 4 KH, and the 7.01 s'posed to be 7 KH??
I just want the controller to give accurate readings.
Charles
 

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Discussion Starter #8
i think you're confused. the ph solutions are a known ph that you calibrate the ph probe to. so that when your ph probe is in your tank it can read what the ph is.

the only place that you need to have a known kh is in your drop checker. when you have 4dkh solution it will turn green when its at 30ppm co2.

look at this chart http://www.tropica.com/article_fullscreen.asp?type=aquaristic&id=445
if you have 6kh and a ph of 6.4 in your tank you have 77ppm of co2. thats too much.
with 6dkh you should set your ph monitor at 6.7.

yellow in your drop checker is too much co2. it should be green

Thanks, that answers my last question.
Charles
 

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Am I wrong in assuming the 4.01 is s'posed to be 4 KH, and the 7.01 s'posed to be 7 KH??
You are mistaken. The 4.01 and 7.01 calibration solutions are for pH, not kH.

You have a pH meter. The pH meter comes with calibration solutions so that it can take accurate pH readings.

Thanks, that answers my last question.
Do be aware that measuring the tank water pH and kH is not a good indication of the amount of CO2 you have in your water, as I have already mentioned.
 

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Discussion Starter #11
no problem. 4.01 is the acid and 7.01 is the neutral.

which model number is your controller is it one of these
http://www.milwaukeetesters.com/pdf/SMS110-SMS120-SMS122.pdf

here is the faq page. i dont think that you have to use the 4.01 solution. maybe someone who know will chime in there. it metions something like it in the faqs
http://www.milwaukeetesters.com/faq.html
SMS122.

Sorry for the dumb post.
I got confused.
The instruction book says to adjust BOTH the 4.01 and the 7.01 levels.
That seems crazy.
Thanks for the input
Charles
 

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the only dumb post is the one not posted.

i think that i've heard before that you dont have to use the 4.01 solution. and they kinda brush up on it ifyou listen to the faqs. why dont you do a little bit of research or call them before you do it
 

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SMS122.

Sorry for the dumb post.
I got confused.
The instruction book says to adjust BOTH the 4.01 and the 7.01 levels.
That seems crazy.
Thanks for the input
Charles
You may want to contact the person that you purchased the controller from and ask what calibration solution(s) was(were) used to calibrated it.

The instruction booklet explains how to adjust it using two different pH solutions, but there is something else that comes with the instructions.
http://www.milwaukeetesters.com/pdf/SMS110-SMS120-SMS122.pdf

There is a brown card that comes with the SMS122 in addition to the instruction booklet. This brown card says the following:

"Please Note:

Because the SMS 122 us used primarily in an aquarium environment (pH 5.5 to 8.5) we strong recommend that your unit be calibrated at the pH 7.0 position only. We have included just a started pack of pH calibration solution 7.01. If your application needs require calibration solution for the Acid or Alkali ends of the pH scale please let us know and we will provide the proper calibration solution.
"


EDIT: I just found the following in the virtual FAQ section on the website: http://www.milwaukeetesters.com/faq.html
Why does my SMS122 only come with 7.01 calibration solution? Click on it and there is an audio/visual response to this question for .
 
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