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- W2140819879 abstract "We describe an automated apparatus for calibrating hydrometers by hydrostatic weighing (Cuckow's method) in tridecane, a liquid of known, stable density, and with a relatively low surface tension and contact angle against glass. The apparatus uses a laser light sheet and a laser power meter to position the tridecane surface at the hydrometer scale mark to be calibrated with an uncertainty of 0.08 mm. The calibration results have an expanded uncertainty (with a coverage factor of 2) of 100 parts in 106 or less of the liquid density. We validated the apparatus by comparisons using water, toluene, tridecane and trichloroethylene, and found agreement within 40 parts in 106 or less. The new calibration method is consistent with earlier, manual calibrations performed by NIST. When customers use calibrated hydrometers, they may encounter uncertainties of 370 parts in 106 or larger due to surface tension, contact angle and temperature effects." @default.
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- W2140819879 date "2007-11-30" @default.
- W2140819879 modified "2023-10-16" @default.
- W2140819879 title "Hydrometer calibration by hydrostatic weighing with automated liquid surface positioning" @default.
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- W2140819879 doi "https://doi.org/10.1088/0957-0233/19/1/015104" @default.
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