[Homeroast] Boiler auto-fill circuity and distilled water RE: Distilled H2O

J3R j at j3r.org
Tue Jun 4 20:54:14 CDT 2013

On 13-06-04 09:38 PM, ricky carter wrote:
> ok a lot of conjecture here, and the information is soooo easy to find.
>   while distilled water will (barely) conduct electricity, it's anywhere
> from 1000 to 1,000,000 times poorer conductor than regular tap water,  :
> Wikipedia - on distilled water's conductivity
>   "Although water is generally considered to be a good electrical
> conductor—for example domestic electrical systems are considered
> particularly hazardous to people if they may be in contact with wet
> surfaces—*pure * water is a poor conductor. Conductivity of sea-water is
> typically 5 S/m,[4]<http://en.wikipedia.org/wiki/Purified_water#cite_note-4>
> drinking
> water is typically in the range of 5-50 mS/m, while highly purified water
> can be as low as 5.5 μS/m, a ratio <http://en.wikipedia.org/wiki/Ratio> of
> about 1,000,000:1,000:1."

What espresso machines actually use electrical conductivity of water to 
measure water levels? is this a real concern? This seems a terrible way 
to do it, when buoyancy (or a number of other possibilities) works so 
well? Why would you use this?


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