PH monitor calibration.

fishboy · #1 09-17-2002, 02:10 AM

Just wondering how often I should calibrate my pinpoint ph monitor? I've had it running 24/7 for about 6 weeks. I did a small water change tonight and put it in the fresh salt water out of curiosity. It seemed high so I checked it with the calibration fluid. It was .14 too high. Does this sound normal for the initial use?

Doug · #2 09-17-2002, 10:31 AM

I calibrate mine every couple months or so. Seems sometimes they wander bad and other times they dont. :confused:

Of course as the probe ages, it gets worse.

chicki · #3 09-19-2002, 03:10 PM

Thats one of the items I'd put in my "shouldn't have bought file"! I never trust it and always end up checking my ph the old way! so it really doesn't do me a lot of good!

Aquattro · #4 09-19-2002, 03:20 PM

As a quick test you can mix a small borax solution and it buffers to pH 9.2. Anytime I think the reading isn't right, I mix a batch of this to test it. Recipe available if anyone wants it.

ldzielak · #5 09-19-2002, 09:43 PM

Since I work in Pulp and Paper mills, I know pH is the most fequently re-calibrated equipment. Most mills do critical measurments weekly if not sooner.

Lee

fishboy · #6 09-20-2002, 12:53 AM

Reef Raf,

What's a borax solution? :confused: Some how it sounds like something that shouldn't get near my tank.

Aquattro · #7 09-20-2002, 01:17 AM

Borax is washing soda. Brand name is Twenty Mule Team and it can be used in combination with baking soda to raise your alk. Mixing it in purified water gives a pH of 9.2. Perfectly safe even if you splashed some in the tank. I'll post a link to Craig Bingman's article about it.

Aquattro · #8 09-20-2002, 01:18 AM

Here is the link

http://www.animalnetwork.com/fish2/a...io/default.asp

Doug · #9 09-20-2002, 10:03 AM

Thanks Brad. I was trying to find it to post.