Checking S.G. During Fermentation

[Steve_M]

This is our 3rd yr using grapes and I still do not have a good grasp on how to test the s.g. while in primary. Is using a refractometer and adjusting for alcohol accurate?
Or best to use hygrometer, but then how to you get accurate reading with all of the co2 bubbles and everything else floating in the mix?
For example just checked with hydrometer and have a reading of 7 Brix.

Steve

 

[Kraffty]

You're best off pulling a sample and using a test tube (container) to use your hydrometer in rather that in with the grapes. You can dump it back in once you test so there's no waste assuming you sanitize everything first.
Mike

 

[Johnd]

Try pushing a fine strainer down into the must without submerging it, and allowing it to fill through the mesh, straining out particles. Scoop liquid out with a cup and put it into your testing vessel, the drop in the hydrometer. If bubbles collect on it and cause it to rise, give it a spin with your fingertips to clear them.

 

[Ajmassa]

I use my wine thief right into the wine. And I check before punching the cap. I Make myself a nice little hole and instert the tube on an angle. Needs to be jerked back and forth to fight through the solids. But you can feel when it’s filling. And then put it right in the test cylinder. 2 or 3 pulls needed. Sometimes it’s clean enough to get a reading. Other time I’ll then pour through a strainer into a measuring cup, and then back into the testing cylinder.
Every time I have all needed tools cleaned and sanitizer ready to use. And always a roll of paper towels at arms reach!

*notice my reply does not answer the original question at all. Hope it helps anyway.

 

[Steve_M]

Ok that’s what I’ll try using strainer!

Steve

 

[salcoco]

it is less trouble using a refractometer only need a drop. then use conversion tables that account for alcohol distortion to get final reading.

 

[Boatboy24]

Try pushing a fine strainer down into the must without submerging it, and allowing it to fill through the mesh, straining out particles. Scoop liquid out with a cup and put it into your testing vessel, the drop in the hydrometer. If bubbles collect on it and cause it to rise, give it a spin with your fingertips to clear them.

That is precisely what I do.