Re: Refractometer -v- Hydrometer
Very good point Jp,
Hydrometers do not work well in a mash/must/wash with a high solid content. This is a real problem in the wine making world as well as the grain mashing world. Basically if your mash/must/wort/wash (with molassas) contains solids - its tough to get a good SG reading on your hydrometer. Unless you either have a good filtering mechanism (l have used Melita #2 coffee filters to get solids out with some success) or some type of centrifuge to get the solids out (see below), its hard to get an acurate reading. While a refractometer works well, it is expensive and from experience, if you use your taste buds regarding sweetness in the fermentation and measure your sugars/grains mixture right - it might save alot of work and money...
Vino es Veritas,
Jim aka Waldo.
A centrifuge is a piece of equipment, generally driven by a motor, that puts an object in rotation around a fixed axis, applying a force perpendicular to the axis. The centrifuge works using the sedimentation principle, where the centripetal acceleration is used to evenly distribute substances (usually present in a solution for small scale applications) of greater and lesser density. There are many different kinds of centrifuges, including those for very specialised purposes. It can be used for viable counts, when shaking the culture e.g. yeast, out of suspension.
--- In firstname.lastname@example.org, "jp_koning" <info21@...> wrote:
> Hi Eddie.
> I use a cheap optical handheld refractometer which costed about 50 box.
> The benefit is that I need only one drop which I can easily take out of
> the mash.
> My allgrain mashes of rye, cornmeal and barlymalt are mostly very thick
> and sticky and I found it difficult to filter enough (100cc) of clear
> liquid out of the slurry to get my hydrometer floating.
> At first I checked the result whith my hydrometer for comparing, but I
> found I can trust on my Refractometer readings and don't use the hydro
> Gr, Ko.