Features of Tuning Fork Density Meter

Technical Parameters

Measuring range	0 – 2.5 g /cc (0 – 2500 kg/m3)，0~100.0%
Calibration range	0 – 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 pressure	4mpa
Fluid Viscosity Range	0 – 2000 cP
Temperature Coefficient	Less than 0.1 kg/m3 /°C (±0.5%) after correction
pressure effect	negligible
Built-in temperature sensor	Digital sensor, temperature compensation
Wetted material	316L, 2205, 2507 Stainless Steel, Ha C, Titanium, PTFE/PFA
Fork Coating	Standard PTFE or PFA
Power supply	24VDC, ≥50mA
Analog signal output	4-20mA, 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 connection	DIN 50 PN16 G1.5″ Thread, 3″ Chuck, IDF and RJT Sanitary
degree of protection	IP65
shell	aluminum alloy

Measuring Barrel

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.

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

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

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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