Why are you using a DO meter

[Owenbräu]

Today's brew

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[Bryan R]

I am much lower on my dough in with a soft underlet, co2/n2 grist purge/ system purge and SG. I am down to sub 10ppm consumption of total sulfites for the entire brew session. I get too much sulfur with even 20ppm sulfites now. Slowly making my way to the goal of 0!

[lupulus]

[Owenbräu]

I think it's just that one was dipped in strike water and the other dipped in wort, plus the early one had mostly dried and the other was minutes old. I think they are the same. This is also mash concentration, and I sparge. The levels will be reduce in the final volume of the wort.

[lupulus]

Thanks Abbey!

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[Weizenberg]

[Brody]

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I'm in the midst of a helles brew day at the moment. Lately something that's been on my mind is how much more aggressive is a single vessel BIAB style lauter and dough in than a duel vessel/pumped/underlet setup.

For dough in I use a stainless steel scoop and take my time gently adding the grain to the kettle.
For lautering I get up on a chair and very slowly lift the bag out. There is some light dripping of course during the final hoist.

I just pulled a sample pre-boil for taste, pH, and gravity and decided to stick my freshly calibrated extech DO meter in it. It stablized at 0.31mg/l (post lauter and jostled around a bit).

You guys tell me - does this allow me to conclude that, while it's a pain in the ass to do gently, a careful single vessel lauter does not introduce a detrimental amount of O2? Or are these meters suspect enough at low levels that I can't conclude anything?

[Weizenberg]

Check your manual. These meters have an accuracy of 0.5 mgl. So, 0.3 + 0.5 = 0.8 < 1.0

Looks like you are fine.

PS:. For what it's worth, I've build a HERMS system to see what all this is about. I must say that I don't like it much. Arguably I am a noobie with this setup, but the complexity involved and the potential shear stresses, didn't give me that Eureka, this is it feeling. I reckon I made better wort with less fuss using agitation and no-sparge. Something you might want to consider.

Decent agitators are available off shelve and a 12V motor with the relevant torque is 1/3 the price for that extra pump.

[lupulus]

Nico, when you have a few mins, can you describe the parts of your agitator? No hurry. One day, I would like to check how it works compared to recirculation.
Cheers,

[Bryan R]