Densimeter


Also found in: Dictionary, Thesaurus, Medical, Legal, Wikipedia.
Related to Densimeter: densitometer

densimeter

[den′sim·əd·ər]
(engineering)
An instrument which measures the density or specific gravity of a liquid, gas, or solid. Also known as densitometer; density gage; density indicator; gravitometer.

Densimeter

 

an instrument for continuous or batch measurement of the density of substances during their production or processing; built into production lines or equipment. Densimeters for measuring the density of liquids, which are the most common, are divided into float, balance, hydrostatic, radioisotope, vibration, and ultrasonic types, according to their principle of operation. A group of devices for measuring the concentrations of solutions—alcoholometers, saccharometers, oil pycnometers, and lactometers for measuring the fat content of milk—are similar to densimeters.

Float densimeters are constructed with a free float, which is a constant-mass hydrometer, or with a submerged float, which is a constant-volume hydrometer. The error of densimeters of this group is ±(0.2–2) percent of the range of measurement, depending on the design.

Balance densimeters are based on the continuous weighing of a certain volume of liquid. The error of such densimeters is ±(0.5–1) percent. In hydrostatic densimeters, the difference Δρ in the pressures of two columns of liquid of different heights is a measure of the density ρ:Δp = ρgh, where g is the acceleration due to gravity and h is the difference in height of the columns. The value of Δρ is measured directly by pressure sensors or as the difference in pressures required to force out bubbles of a gas (air) in the liquid at various depths. The error of such densimeters reaches ±(2–4) percent of the range of measurement.

The operation of radioisotope densimeters is based on measurement of the change in intensity of a beam of gamma or beta rays as a result of their absorption or dispersion by a layer of liquid (the attenuation of the beam for a given thickness of the layer is determined by the density of the liquid). The error of radioisotope densimeters is of the order of 2 percent of the range of measurement.

The sensor of a vibration densimeter contains a body (a hollow cylinder, a plate, or a tuning fork) to which vibrations are imparted from without. The resonance frequency of the vibrations of the body in the substance is determined; the frequency decreases with increasing density of the substance tested. The error of vibration densimeters is ±(1–2) × 10-4 g/cm3.

The operation of an ultrasonic densimeter is based on the dependence of the speed of sound c in a medium on the density of the medium: Densimeterwhere β is the coefficient of adiabatic compressibility of the liquid. The error of such densimeters is about 2-5 percent of the range of measurement.

Radioisotope, ultrasonic, vibration, and a number of other methods may be used to determine the density of solids and gases.

REFERENCES

Kivilis, S. Sh. “Pribory dlia izmereniia plotnosti zhidkostei i gazov.” In Priborostroenie i sredstva avtomatiki, vol. 2, book 2. Moscow, 1964.
Izmerenie massy, ob”ema i plotnosti Moscow, 1972.
Glybin, I. P. Avtomaticheskie plotnomery. Kiev, 1965.

S. SH. KIVILIS

densitometer

i. An instrument for measuring the density or specific gravity of fuel. Also called a densimeter.
ii. An instrument for measuring the optical density (photographic transmission, photographic reflection, visual transmission, etc.) of a material, generally of a photographic image.
References in periodicals archive ?
The ORNL densimeter is unique in its capability to measure the densities of gases at very high pressures.
Instrumentation: Flardness testers F114 (IRHD); H17A (Shore), micro hardness testers H12 (IRHD), H17M (Shore); densimeter X22B; rapid plastimeter P14; compression stress relaxometer C11; aging chamber 07E, 014; DeMattia flex testing machine F15/16, Mooney viscometer V3, thickness gauges; compression set, plasticity and resilience; specimen preparation equipment
David Reynolds, sales manager Instrumentation: Hardness testers H14 (IRHD); H17A (Shore), mirco hardness testers H12 (IRHD), H17M (Shore); densimeter X22B; rapid plastimeter P14; compression stress relaxometer C11; aging chamber O7E, O14; DeMattia flex testing machine F15/16, Mooney viscometer V3, thickness gauges; compression set, plasticity and resilience; specimen preparation equipment
Total quantity or scope: Supply of laboratory dryer with natural convection - 1 pc, resistance thermometers PT-100 - 3 pcs oscillating densimeter to measure the density of liquids - 1 pc knife grinder - 1 set, precision balance - 1 pc, laboratory freezers - 1 pieces, densimeters oscillatory - 3 units, centrifuges for the determination of fat in milk and milk products by Gerber with accessories - 1 set, the system for the production of ultrapure water - 1 pc, hub, block the evaporation of samples in nitrogen - 1 set , refrigerator-freezers laboratory - 1 pc, a gas chromatograph with MS detector - 1 set, automatically set to the determination of Kjeldahl nitrogen - 1 set, chiller Chiller - 1 unit, extractor - 1 set, 4 sets of pipettes - 3 sets lamps to ASA - 9 units and weight - 1 pc
The auto-weighing function also is a standard featured in the MDS-3000 densimeter system.
Using METTLER xs203s electronic densimeter, density of dried samples was measured.
The density of the foams was measured by an electronic densimeter (Mirage MD-200S, Mirage Trading Co.
The density of the resulting foam was measured by an electronic densimeter (Alfa Mirage Co.
Instrumentation: Hardness testers H14 (IRHD), H17A (Shore A); H17D (Shore D); micro hardness testers H12 (IRHD), H17M (Shore); high precision densimeter X22B; rapid plastimeter P14; compression stress relaxometer C11; aging chambers O7E and O14; DeMattia flex testing machine F15/16; Mooney viscometer V3; thickness gauges; testers for abrasion, compression set, low temperature; plasticity and resilience; specimen preparation equipment Services offered: Calibration, service and repair of all Wallace instruments, worldwide representation
Apparent density measurements with an electronic densimeter (TMI Testing) were conducted on all collected samples to determine their gas fraction.
Instrumentation: Hardness testers H14 (IRHD), H17A (Shore A); H17D (Shore D); micro hardness testers H12 (IRHD), H17M (Shore); high precision densimeter X22B; rapid plastimeter P14; compression stress relaxometer C11 ; aging chambers O7E and O14; DeMattia flex testing machine F15/16; Mooney viscometer V3; thickness gauges; testers for abrasion, compression set, low temperature; plasticity and resilience; specimen preparation equipment
Instrumentation: Hardness testers H 14 (IRHD), H17A (Shore A); H17D (Shore D); micro hardness testers H12 (IRHD), H17M (Shore); high precision densimeter X22B; rapid plastimeter P14; compression stress relaxometer C11; aging chambers O7E and O14; DeMattia flex testing machine F15/16; Mooney viscometer V3; thickness gauges; testers for abrasion, compression set, low temperature; plasticity and resilience; specimen preparation equipment