VEE GEE API Hydrometers with Spirit-Filled Thermometer

Calibrated at 60°F

The API Scale was selected in 1921 by the American Petroleum Institute (API), the U.S. Bureau of Mines, and the National Institute of Standards and Technology (NIST) as the standard hydrometer scale for petroleum products. The API Scale is based on the formula below.

The thermometer scale for VEE GEE® Hydrometers (w/ Thermometers) is located in the body. A correction scale for conversion of readings to 60°F is printed opposite the temperature scale.

Specifications
Model	API Range	Subdivision	Thermometer Scale (Subdivision: 2°F)	Length
VG6751HTS	-1 to 11°	0.1°	0 to 150°F	380 mm
VG6752HTS	9 to 21°
VG6753HTS	19 to 31°			385 mm
VG6754HTS	29 to 41°			380 mm
VG6755HTS	39 to 51°			385 mm
VG6757HTS	59 to 71°
VG6608-4TS	29 to 41°	1.0°	10 to 130°F	210 mm
VG6608-5TS	39 to 51°
VG6608-6TS	49 to 61°
VG6608-12TS	45 to 90°

The hydrometer is an instrument which is constructed on the Archimedes principle that a solid body displaces its own weight of the liquid in which it floats. Hydrometers can be divided into two general classes; namely for liquids heavier than water and for liquids lighter than water. The base hydrometer scale is Specific Gravity, in which distilled water equals 1.000 as the initial point. Liquids lighter than water are scaled below 1.000 specific gravity and liquids heavier than water are scaled above 1.000 specific gravity. Many other scales are commonly used, such as API, Brix, Baume, Plato, etc. All of which are convertible into specific gravity by formula.

Hydrometers are usually calibrated at 60°F/ 60°F. To determine the density of a liquid, the liquid should be at 60°F. If the temperature varies, the liquid will either contract or expand, depending upon the temperature. Therefore, the density fluctuates with the temperature. Where there is a variation from the standard 60°F, corrections must be applied to the hydrometer reading. To assure proper corrections, a separate accurate thermometer should be used, or a hydrometer in combination with a thermometer, which is sometimes referred to as a “thermohydrometer.” The correct method of reading a hydrometer follows:

1. Observe a point below the plane of the liquid surface. The surface should appear as an ellipse
2. The line of vision is raised until the surface, seen first as an ellipse, becomes a straight line
3. The point at which this line cuts the hydrometer scale is the reading of the instrument

If the liquid is not sufficiently clear for readings to be made in this manner, read from above the surface and estimate as accurately as possible the point to which the liquid rises on the hydrometer stem. Since hydrometers are calibrated to give correct indications when read at the principal surface of the liquid, correct the reading just taken at the upper edge of the meniscus by an amount equal to this height above the principal surface of the liquid. The amount of correction can be determined with the sufficient accuracy for most purposes by taking a few readings on the upper and lower meniscus in a clear liquid of the same character as that being tested and noting the differences.

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