Tuning fork density meter is also called density analyzer , fork densitometer or density sensor. Tuning fork density meter is a process control instrument for density as the primary control parameter, or an online analysis instrument for other quality control parameters such as solid percentage. Continuous and real-time online measurement of fluid density. The Tuning fork density meter is installed on the pipeline, in an open or closed storage tank, and the density of the detected fluid depends directly on the vibration frequency received by the tuning fork in the medium where the sensor is inserted.

Tuning Fork Density Meter

Features of Tuning Fork Density Meter

  • Tuning fork vibrating density meter, equipped with a microprocessor-based electronic conversion device. Integrates signal processing, calculation and diagnostic functions;
  • In addition to convincing measurement accuracy and reliability, it can directly communicate with PC through the RS485 interface. Under the ADView software environment, users can directly perform online node configuration, fault diagnosis and data recording;
  • While measuring density and temperature, parameters such as basic density, °API, Brix, concentration percentage, mass percentage, volume percentage, and specific gravity can also be calculated;
  • The instrument adopts various chips with high performance, high speed and high reliability. It optimizes signal acquisition, algorithm and mechanical structure. Thereby improving the response speed, function and reliability of the product;
  • The instrument can switch the alarm mode according to the demand;
  • Customized adjustment sensitivity according to material and site requirements;
  • According to the on-site use environment, we can provide products with high protection, explosion-proof, high temperature and high pressure resistance;
  • In addition, there are many options for the power supply mode, connection mode, and liquid-wetted material of the product for users to match;
  • Simple installation, plug and play, maintenance-free. Can measure the density of mixed media containing solids or air bubbles;
  • Built-in PT100 temperature sensor to realize full temperature automatic compensation;
  • The circular arc structure design of the fork body avoids hanging material and has good stability.

Technical Parameters

Measuring range0 – 2.5 g /cc (0 – 2500 kg/m3),0~100.0%
Calibration range0 – 2.5 g /cc (0 – 2500 kg/m3),0~100.0%
measurement accuracy± 0.001 g /cc (± 1 kg/m3) ,±0.5%
repeatability± 0.001 g /cc (± 0.1 kg/m3) ±0.1%
Operating temperature range-50℃ ~ +150℃
working pressure4mpa
Fluid Viscosity Range0 – 2000 cP
Temperature CoefficientLess than 0.1 kg/m3 /°C (±0.5%) after correction
pressure effectnegligible
Built-in temperature sensorDigital sensor, temperature compensation
Wetted material316L, 2205, 2507 Stainless Steel, Ha C, Titanium, PTFE/PFA
Fork CoatingStandard PTFE or PFA
Power supply24VDC, ≥50mA
Analog signal output4-20mA, 0-1000Hz, RS485 Modbus RTU HART
Output accuracy (20℃)± 0.1% of reading or ± 0.05% FS
Output repeatability (-40 ~ +85°C)± 0.05% FS
process connectionDIN 50 PN16 G1.5″ Thread, 3″ Chuck, IDF and RJT Sanitary
degree of protectionIP65
shellaluminum alloy
  • Model: Alcohol Concentration Meter
  • Length: 150mm
  • Measuring range: 0-2.5g/cc(0-100%)
  • Measurement accuracy: 0.002g/cm3 (0.5%)
  • Voltage: DC24V
  • Explosion-proof: Exd IICT6 Gb
  • Electrical interface: M20*1.5
  • Wetted material: 316L, built-in temperature sensor
  • Liquid crystal display: density, concentration, specific gravity, temperature
Alcohol Concentration Meter
  • Model: Submersible tuning fork density meter
  • Four-wire system/two-wire system
  • Power supply: DC24V
  • Connection method: DN50PN16
  • Insertion length: 10m
  • Wetted material: 316L stainless steel
  • Output: 2-way 4-20Ma+RS485/MODBUS
  • Electrical interface: M20*1.5
  • Display: Four digits after the decimal point, LCD, remote PLC/DCS
  • Junction box: aluminum alloy
Submersible tuning fork density meter
  • Model: Anti-corrosion tuning fork density meter
  • Four-wire system
  • Power supply: DC24V
  • Connection method: DN50PN16
  • Insertion length: 150mm
  • Wetted material: 316L stainless steel lined with PTFE
  • Output: 2 channels 4-20Ma+RS485/MODBUS/HART
  • Electrical interface: M20*1.5
  • Display: four digits after the decimal point, LCD, remote PLC/DCS
  • Junction box: aluminum alloy
Anti-corrosion tuning fork density meter
  • Model: Threaded tuning fork density meter
  • Four-wire system
  • Power supply: DC24V
  • Connection method: G1-1/2 thread
  • Insertion length: 150mm
  • Wetted material: 316L stainless steel
  • Can be customized (ha C, titanium, 2205, 2507
  • Duplex stainless steel, load)
  • Output: 2 channels 4-20Ma+RS485/MODBUS/HART
  • Electrical interface: M20*1.5
  • Display: Four digits after the decimal point, LCD, remote PLC/DCS
  • Junction box: aluminum alloy
Threaded tuning fork density meter
  • Model: Flange standard tuning fork density meter
  • Four-wire system (for measuring lime slurries, mud, etc.)
  • Power supply: DC24V
  • Connection method: DN50PN16-20592
  • Insertion length: 150mm
  • Wetted material: 316L stainless steel
  • Can be customized (ha C, titanium, 2205, 2507
  • duplex stainless steel, aluminum, PTFE/PFA)
  • Output: 2 channels 4-20Ma+RS485/MODBUS/HART
  • Electrical interface: M20*1.5
  • Display: Four digits after the decimal point, LCD, remote PLC/DCS
  • Junction box: aluminum alloy
  • Built-in temperature sensor, automatic compensation
Flange standard tuning fork density meter
  • Model: Sanitary Chuck type tuning fork density meter
  • Four-wire system
  • Power supply: DC24V
  • Connection method: 3 inch chuck
  • Insertion length: 150mm
  • Wetted material: 316L stainless steel
  • Can be customized (ha C, titanium, 2205, 2507
  • duplex stainless steel, tan, PTFE/PFA)
  • Output: 2 channels 4-20Ma+RS485/MODBUS/HART
  • Electrical interface: M20*1.5
  • Display: Four digits after the decimal point, LCD, remote PLC/DCS
  • Junction box: aluminum alloy
  • Built-in temperature sensor, automatic compensation
Chuck type tuning fork density meter
  • Model: Top Mounted Rod Tuning Fork Density Meter
  • Four-wire system/two-wire system
  • Power supply: DC24V
  • Connection method: DN50PN16
  • Insertion length: 3m (shield type)
  • Wetted material: 316L stainless steel
  • Output: 2 channels 4-20Ma+RS485/MODBUS/HART
  • Electrical interface: M20*1.5
  • Display: density, concentration, temperature, remote PLC/DCS
  • Junction box: aluminum alloy
  • Built-in temperature sensor, automatic compensation
Top Mounted Rod Tuning Fork Density Meter
  • Model: Pool tank or special type with stirring tank
  • Four-wire system
  • Power supply: DC24V
  • Connection method: DN50PN16
  • Insertion length: 150mm
  • Wetted material: 316L stainless steel
  • Can be customized (ha C, titanium, 2205, 2507
  • duplex stainless steel, tan, PTFE/PFA)
  • Output: 2 channels 4-20Ma+RS485/MODBUS/HART
  • Electrical interface: M20*1.5
  • Display: four digits after the decimal point, LCD
  • Junction box: aluminum alloy
  • Built-in temperature sensor, automatic compensation
Pool tank or special type with stirring tank

Measuring Barrel

316L three-way expansion type
316L tee expansion tube type
UPVC/PTFE tee expansion tube type
UPVC/PTFE tee expansion tube type

fork density meter principle

Tuning fork density meter (concentration meter) can perform density detection online in real time. It can be applied to the process control of products with density as the basic parameter or the quality control with solid percentage or concentration percentage as reference.

Typical industries include petrochemical industry, brewing industry, food industry, pharmaceutical industry and mineral processing (such as clay, carbonate, silicate, etc.). Specifically used in the interface detection in multi-product pipelines in the above industries, the density detection of stirred mixtures, the end point monitoring of reactors, and the interface detection of separators.

Tuning fork density sensors work on the principle of vibration of components, which are part of the tuning fork immersed in the liquid to be measured. The tuning fork part is vibrated by an internal piezoelectric device fixed at the bottom end of the fork body. The oscillation frequency is detected by a secondary piezoelectric device fixed at the other end of the fork. The signal is then amplified by the circuit on top. The density of the liquid is closely related to the vibration frequency when the measured liquid flows. When the density of the measured liquid changes, the vibration frequency of the liquid changes accordingly.

Through the following equation, the density of the measured liquid can be accurately calculated.

D= K0+K1T+K2T2
D = uncalibrated density of the measured medium (kg/m3)
T=vibration frequency (μs).
K0, K1, K2 = constant

During the density detection process, the Tuning fork density meter (concentration meter) can automatically compensate the influence of temperature on the density (D) of the measured medium. Pressure has no significant effect on density.

fork density meter principle

Read More About: What Is Density Meter? and Types

Tuning Fork Density Meter Application

Tuning fork density meters are suitable for measuring the density of various types of liquids and solid substances.

Its application range is quite wide, including but not limited to the following types of substances:

  • Liquids: water, solutions, alcohols, petroleum, chemicals, liquid metals, etc.
  • Solution: solid or gas dissolved in a solvent, such as salt water, acid-base solution, dissolved matter in an organic solvent, etc.
  • Oil: various types of lubricating oil, mechanical oil, edible oil, etc.
  • Chemicals: various chemicals, solvents, acids and bases, etc. nitric acid, phosphoric acid, acetic acid, chloroacetic acid, potassium hydroxide, sodium chloride, sodium sulfate, ammonium sulfate, ammonium bisulfate, ammonium chloride, carbamide, ferric chloride, ammonia, hydrogen peroxide
  • Fuel: gasoline, diesel, liquefied petroleum gas (LPG), aviation fuel, crude oil, kerosene, silicone oil, etc.
  • Plastics: Different kinds of plastic materials, resins, etc.
  • Metal: liquid metal, alloy, etc.
  • Food and beverages: milk, juice, beer, wine, etc.
  • Organic chemical industry: ethanol, methanol, ethylene, toluene, ethyl acetate, ethylene glycol, thinner water
  • Medicine: pharmaceutical intermediates, solvents, polyvinyl alcohol (PVA), citric acid, lactic acid
  • Semiconductors: high-purity solvents, detergents, isopropanol, butyl acetate
  • Printing and dyeing: sodium hydroxide, sodium carbonate, sodium bicarbonate
  • Equipment: cutting fluid, emulsified oil, cutting oil, lubricating oil, antifreeze
  • Batteries: hydrochloric acid, sulfuric acid

Typical application industries:

  • Chemical measurement;
  • reservoir measurement;
  • Slurry measurement;
  • Medicine tank measurement;
  • Cement measurement;
  • printing and dyeing measurement;
  • Waste acid tower measurement;
  • power plant measurement;

Please note that different models of tuning fork densitometers may have limited range of application. Specific measurement ranges and accuracies may depend on equipment specifications and manufacturer’s instructions. Therefore, before choosing a tuning fork density meter for specific material density measurements. It is best to refer to the technical specifications and instructions for use of the equipment to ensure that it is suitable for the substance of interest.

case study

A customer consulted us and needed to measure the density in the sediment pipe dug out by the dredger.

For dredger applications:

  • Installation size: pipe with a diameter of 30cm
  • Insertion Depth Length: 2”
  • Wetted material: mud sand
  • Need signal output: 4-20ma
  • Pressure: 0-10bar
  • Density (or concentration) range: 0-2000kg/m3
case study-Tuning Fork Density Meter

Combined with the user’s measurement parameters, we have configured a density meter for the user:

Tuning Fork Density Meter:

  • A layer of wear-resistant material is added to the 316 sensor
  • Power supply DC24V,
  • Medium: Mud,
  • Pressure: 0-10bar,
  • DN50 flange connection,
  • Insertion depth: 180mm,
  • Material: 316+ wear-resistant coating,
  • Output 4-20mA four-wire system + RS485,
  • Density (or concentration) range: 0-2000kg/m3,
  • Installation size: pipe with a diameter of 30cm,
  • English interface

FAQ

A fork density meter uses a tuning fork-shaped probe that vibrates at its natural frequency. When immersed in a liquid, the frequency changes based on the liquid’s density. By measuring this frequency change, the device can accurately determine the density of the liquid.

Tuning fork density measurement is a method to measure the density of a liquid. It uses a fork-shaped sensor that vibrates at a specific frequency. When this fork is exposed to a liquid, the density of the liquid alters the vibration frequency. This change in frequency is then analyzed to calculate the liquid’s density.

A density meter works by employing different principles like oscillation, buoyancy, or radiation to measure the density of a substance. By observing how the substance interacts with these principles, the meter can calculate the mass per unit volume, providing the density of the material.

A densimeter is used to measure the density of a substance, typically liquids or gases. Density is the mass of the material per unit volume and is a crucial property in various industrial, laboratory, and research applications.

More Measurement Solutions

Density is an important parameter in the industrial production process. Density measurement is a very professional field. Different media have different physical properties. Only by selecting suitable instruments according to different media properties can accurate and reliable measurements be made. Unique performance is brought into play.

Sino-Inst is a manufacturer of tuning fork density meters. Our tuning fork density meters are used in a wide variety of industries. Including, petrochemical industry, brewing industry, food industry, pharmaceutical industry and mineral processing (such as clay, carbonate, silicate, etc.). Different media require different densitometers. You can contact our sales engineers for technical support and quotation for tuning fork density meters.

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Tuning Fork Density Meter | Sino-Inst

Tuning fork density meter is also called density analyzer , fork densitometer or density sensor. Tuning fork density meter is a process control instrument for density as the primary control parameter, or an online analysis instrument for other quality control parameters such as solid percentage. Continuous and real-time online measurement of fluid density. The Tuning fork density meter is installed on the pipeline, in an open or closed storage tank, and the density of the detected fluid depends directly on the vibration frequency received by the tuning fork in the medium where the sensor is inserted.

Product SKU: Tuning Fork Density Meter

Product Brand: Sino-Inst

Product Currency: USD

Product Price: 1850

Price Valid Until: 2029-09-09

Product In-Stock: InStock

Editor's Rating:
5