hydrometer calibration

[bcarwile123]

I have a Cole-Parmer hydrometer #08298-65 that reads from 1.000/1.070 and want to calibrate it using Claude's calibration excel spreadsheet.  What would be a good choice for the calibration solutions for me to use if I am using the salt based calibration solutions and dong 3 points?   Thanks much.

Bill Carwile   

[Claude Jolicoeur]

The ideal youd be to have 3 solutions:

Pure distilled water for 1.000 and brine (salt-water) solutions for the mid-scale (around 1.030) and for the high part of the scale (around 1.065)

See my book page 167 for how to prepare such solutions.

[Bill Carwile]

Thanks Claude.

Bill

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[gareth chapman]

I'm not sure it's worth the effort.

Like Claude I found different readings across different hydrometer, some which were quite expensive and even came with calibration certificates.

My solution was to ditch them all apart from one, well two actually. The same Cole Parmer instrument you use and another Cole Parmer which reads sub SG 1.000.

I know some of us would prefer absolute accuracy(myself included) but I have managed to ignore the scientist in me to a certain degree and satisfy myself that there is enough comparative accuracy in a forty quid hydrometer for cider making.

Imho there are too many operational variations to make it worth bothering about e.g.reading error, particularly on low resolution hydrometers, sample variations such as dissolved gas, turbidity, the presence of other solutes etc.

As I said I have just resolved to using the same hydrometer for everything now. In fact for most of my bulk fermentation I now use ispindles for convenience and live with their limitations.