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Hydrometer Calibration

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#1 Sdurbanfarmer


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Posted 15 January 2020 - 10:48 PM

Hi All,


A company I am working with is using Sodium Bicarbonate in their water and using a twaddle hydrometer to measure the density. During our last Primus inspection they were told to list calibration procedures for the twaddle hydrometer. Unfortunately the only information I have is a chart somebody made with the solution temperature, twaddle hydrometer stem reading, and the % of the Sodium Bicarbonate. I dont know where the list came from but I believe this is what they based their SOPs off of. Would it be safe to say that calibration could be conducted by testing against the chart? 


I am sort of at a loss here.

#2 Ryan M.

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Posted 15 January 2020 - 11:38 PM

You can check it in water.  I think the auditor was referencing you to "verify" the hydrometer is still accurate.  You can't really calibrate a conventional hydrometer.




Twaddle Hydrometer

The Twaddle scale is a simplified scale based on specific gravity where 0° Twaddle equates to SG60/60°F of 1.00 (that of water) and each degree Twaddle equals 0.005° SG. 

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