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    What is a Density Meter?

    A density meter is a common measuring instrument, that is widely used in industry, chemical industry, electric power, ships, machine tools, and other industries. When we use the density meter for its principle and use are needed to master, which is very important for the use of density meter. Next, ATO organized the relevant information and introduce the principle and use of a density meter, hope to help you.


    The structure of density meter generally includes float, floating pole, density meter cylinder and density meter bracket and other parts.

    • Float: Float is the core component of density meter, usually made of stainless steel, glass and other materials. The shape of the float is usually cylindrical or spherical, with one or more weights on its upper part, used to adjust the balance of the float. The density of the float is usually similar to the density of the substance to be measured.
    • Floating pole: The floating pole is the part used to connect the float to the density meter cylinder and is usually made of metal. It has a certain degree of elasticity, can ensure that the float in the density meter cylinder free up and down movement.
    • Density meter cylinder: The density meter cylinder is a hollow cylindrical container, usually made of glass or plastic. Its bottom is a density meter scale, used to read the density value of the measured substance. The density meter cylinder has a certain degree of transparency, so that it is easy to observe the position of the float.
    • Density meter bracket: The density meter bracket is used to support the density meter cylinder and keep it stable. It is usually made of metal and has a certain height and stability.


    According to the different application scenarios of density meters, density meters can be categorized into desktop density meters and portable density meters.

    According to the different forms of substances measured, density meters can be divided into solid density meters, liquid density meters, and gas density meters.

    According to the different working principles, the density meter can be divided into static pressure type, vibration, float, and radioisotope-type density meter.

    density meterCommon Density Meters

    Buoyancy Density Meter: A traditional way of calculating the density of a substance using Archimedes' principle. It is suitable for most liquids at room temperature, such as the determination of petroleum products, chemicals, beverages and other fields.

    Pressure Density Meter: It utilizes a pressure sensor to measure the pressure of a liquid or gas and calculates the density based on the relationship between pressure and density. This type of density meter is suitable for various liquids and gases.

    Vibrating Tube Density Meter: It measures density by correlating the frequency of vibration in the tube with the density of the liquid. The frequency of vibration changes as the liquid flows through the vibrating tube, and the density of the liquid can be obtained by measuring this change.

    Radiation Density Meter: It uses rays emitted by a radioactive source (e.g., a radioisotope) to pass through a sample for measurement. The density of the liquid is determined by measuring the absorption or scattering of the rays.

    Working Principle

    The principle of density meter measurement is to measure the volume of liquid and solid discharged by putting the object to be measured into a container, and then calculate the density size of the object according to the formula. Commonly used density meters are float density meters, static pressure density meter, vibrating density meters and radioisotope-type density meter.

    Float Density Meter:

    The buoyancy force on an object within a fluid is related to the density of the fluid, the greater the density of the fluid the greater the buoyancy force. If the temperature of the sample to be measured is specified (e.g., 25°C is specified), the instrument can also use the specific gravity value as the scale value.

    Static Pressure Density Meter:

    A certain height of the static pressure of the liquid column and the density of the liquid is proportional to the pressure measurement instrument and can therefore be measured according to the value of the static pressure to measure the density of the liquid.

    Commonly used is a single tube blowing type density meter. It is to measure air pressure instead of directly measuring the pressure of the liquid column. The blowing tube is inserted into the measured liquid surface below a certain depth, and compressed air through the blowing tube constantly escapes from the bottom of the tube, the pressure of the air inside the tube will be equal to the height of the sample column pressure, the pressure value can be converted to density.

    Vibrating Density Meter:

    Made of magnetic material vibrating tube with the liquid to be measured, installed in the vibrating tube next to an electromagnetic drive coil, when the coil is passed to the pulse excitation current, the vibrating tube is subject to the magnetic force of the coil to produce vibration.

    In addition, a detection coil is installed next to the vibrating tube, which generates the same vibration frequency with the same current. Since the vibration frequency of the vibrating tube is related to the vibration of the liquid inside the tube, the vibration frequency of the vibrating tube is related to the mass of the liquid inside the vibrating tube.

    That is, and the density of the liquid, can be displayed with a digital meter. And this density meter in addition to general liquids, also applies to the temperature of 150 ℃, or pressure of 1MPa liquid.

    Radioisotope Density Meter:

    The instrument contains a source of radioisotope radiation. Its radioactive radiation (e.g., gamma rays) is received by a ray detector after it passes through a certain thickness of the sample being measured.

    The amount of radiation absorbed by a sample of a certain thickness is related to the density of that sample, and the signal from the ray detector is related to that absorption, thus reflecting the density of the sample.


    Density meters have a wide range of applications in industrial, medical and cosmetic fields. In the industrial field, density meters are commonly used in petroleum, rubber, plastics and metal materials.
    In the medical field, density meters can be used for blood, urine and bone measurements. In the field of cosmetics, density meters can be used in the manufacturing process of perfumes, hair dyes and other products.

    When selecting a density meter, it is important to consider the specific requirements of the application, such as the model number, the material to be measured and the range of applications. You can also shop directly at ATO one-stop online store , where we can help you determine the most appropriate choice for your specific application and you will find it a pleasant shopping experience.

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