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Transcript of hydrometer
- milk, fruit juice, other food liquids
- oil products
- colours, paints
- galvanic baths
- pharmaceutical and cosmetics products
- Accuracy and readout: 5 x 10-5
- Net weight: 7,5 Kg
- Autocalibration with internal calibration mass
- Range of the relative density measurement: 0.5-2.25
- Termometric probe Pt 100 1/3 DIN, accuracy ± 0.05 °C, readability 0.1 °C
- Availability of grams readout
- RS 232 serial output
- Mains supply voltage: 220 V -15% /+10% 10 VA
- Dimensions: W210xD355xH350 mm
- Metrological approval An early description of a hydrometer appears in a letter from Synesius of Cyrene to the Greek scholar Hypatia of Alexandria. In Synesius' fifteenth letter, he requests Hypatia to make a hydrometer for him. Hypatia is given credit for inventing the hydrometer (or hydroscope) sometime in the late 4th century or early 5th century. The history of hydrometer A hydrometer is an instrument used to measure the specific gravity (or relative density) of liquids; that is, the ratio of the density of the liquid to the density of water.
A hydrometer is usually made of glass and consists of a cylindrical stem and a bulb weighted with mercury or lead shot to make it float upright. The liquid to be tested is poured into a tall container, often a graduated cylinder, and the hydrometer is gently lowered into the liquid until it floats freely. The point at which the surface of the liquid touches the stem of the hydrometer is noted. Hydrometers usually contain a scale inside the stem, so that the specific gravity can be read directly. A variety of scales exist, and are used depending on the context.