Backyard Aquaponics
A place to discuss aquaponics

Received my new DO meter today. Milwaukee MW600. After reading directions and calibrating the unit, I took some readings. Aquarium inside- 7.2, FT in AP- 4.9, ST- 7.2, far side of DWC, away from inlet- 6.5
How do those readings compare to yours?
The other issue. There is a plastic protective cap that you're supposed to cover the diode with. I placed the cap over the diode and pushed it on. It "clicks" into place, but now I can't remove it. I'm not weak, and have an above average grip(tennis 2-3x per week, shoveling 5)and pulled at about 75% with no luck. I'm afraid to try and put any more force on it, as the bottom of the unit has plastic threads, and I don't think they'll take much more. Just curious if anyone else has this unit and has had the same issue. I'll give them a call tomorrow and see what they say.






















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Have you tried twisting it off?

I have this unit and lightly put on the cover. Call them up and ask. I'd be afraid to rip off the plastic cover as wellie I pulled on it. My ft is 7 and in side aquarium with a million fry, it's at 4. The smaller the fish, the more oxygen they consume according th Nate story. I should check out the AP sump.

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NEVER had any experience with DO meters and so don't have a good feel for how DO changes with temp.. etc..

I would be curious as to how high you can get that DO reading
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First off I don't have this meter so take my answer with a grain of salt.

Are you talking about the plastic cap that they ship it with or the protective cap? They say in the instructions page 1 to dispose of the red or black plastic cap, it's just for shipping - the probe is shipped dry.

http://www.milwaukeeinstruments.com/pdf/MW600.pdf

If you're talking about the protective cap then that's another story. The instructions indicate a twist and pull motion to remove the protective cap on page 2 in the picture next to the calibration section. If that doesn't work could be that a vacuum has formed but I'd call them and let them walk you through getting it off so there is no doubt if something gets messed up.

Hope this helps

I have the same meter and had the same problem with the cap. No amount of pulling or swearing would remove the cap. I had to carefully cut it off with a razor blade. I store the probe in a small sample jar filled with fresh RO water.

My levels run 7.8 to 8.0 at 75F in an indoor RAS setup with trickle towers.

Thanks guys, obviously a design flaw. I'll call, but will probably end up cutting it off as well. Of course, it won't be much of a protective cap once i cut it up. Twisted and pulled, about as hard as I dare with a plastic cap with plastic threads. I'll cut it off and maybe the next one they send me isn't quite as tight. I assume a fine line between being tight enough to be airtight and protective and "too tight" and impossible to remove.
Going to check the new RAS with the regen air blower and see how high it will read.