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Online Density Meter

 

HY Field Instrument: Your Professional Level Meter Manufacturer!

HY Field Instrument Co., Ltd. has been focusing on field instruments for more than ten years. Our product lines include flowmeters, level meters, pressure transmitters, analytical instruments, etc. The main products include electromagnetic flowmeter, Coriolis mass flowmeter, vortex flowmeter, ultrasonic flowmeter; radar level meter, ultrasonic flowmeter, capacitive pressure transmitter, online density meter, etc.

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Our company has passed ISO9001 certification, and our products have obtained CE, Exploreproof, Atex, and other certifications, with very high reliability.

 

 

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Rosemount 3051C Smart Pressure Transmitter

 

Introduction to Online Density Meter

An industrial online density meter is a liquid density measurement that continuously measures the concentration and density of liquids which can be directly used in industrial production processes. The liquid density meter is a “plug and play, maintenance-free” concentration measuring instrument.

 

Types of Online Density Meter
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1. Float Density Meter
The buoyancy force that the object receives in the fluid is related to the fluid density, and the greater the fluid density, the greater the buoyancy force. If the temperature of the sample to be measured is specified (for example, 25°C), the instrument can also use the specific gravity value as the scale value. The simplest of these instruments is the visual float-type glass hydrometer, referred to as the glass hydrometer.
2. Static Density Meter
The static pressure of a liquid column at a certain height is proportional to the density of the liquid, so the density of the liquid can be measured according to the static pressure value measured by the pressure measuring instrument. The diaphragm (see Diaphragm and Diaphragm) is a commonly used pressure measuring element, and a density meter that directly measures the static pressure of the sample liquid column with it is called a diaphragm static pressure density meter. Another commonly used one is the single tube blown density meter. It measures air pressure instead of the direct measurement of liquid column pressure. Insert the blowing tube to a certain depth below the liquid surface to be measured, and the compressed air will continuously escape from the bottom of the tube through the blowing tube. At this time, the pressure of the air in the tube is equal to the pressure of the sample liquid column at that height, and the pressure value can be converted into density.
3. Vibrating Density Meter
When an object is excited to vibrate, its vibration frequency or amplitude is related to the mass of the object itself. If a certain volume of the liquid sample is filled in the object, the change of its vibration frequency or amplitude will reflect the mass or density of the certain volume of sample liquid.
4. Radioisotope Density Meter
The instrument is equipped with a radioactive isotope radiation source. Its radioactive radiation (such as v-ray) is received by the radiation detector after passing through a certain thickness of the tested sample. The amount of radiation absorbed by a sample of a certain thickness is related to the density of the sample, and the signal of the radiation detector is related to the amount of absorption, thus reflecting the density of the sample.

 

Benefits of Online Density Meter
 

Real-Time Monitoring

Online density meters provide continuous and real-time density measurements, allowing for immediate feedback and proactive control of processes. This enables operators to make timely adjustments and optimize efficiency.

 

Accurate and Precise Measurements

Online density meters offer high accuracy and precision, ensuring reliable and consistent density readings. This helps maintain product quality, improve process control, and minimize errors and inconsistencies.

 

Quality Control

Online density meters contribute to effective quality control by monitoring and verifying product consistency. Deviations from desired density levels can be quickly detected, allowing for immediate corrective actions and ensuring adherence to desired specifications.

 

Automation and Integration

Online density meters can be integrated into process control systems, enabling automation and remote monitoring. This reduces manual intervention and enhances operational efficiency by providing seamless data integration with other process parameters.

 

Safety Enhancements

The real-time density measurements obtained from online density meters can contribute to improved safety in various industrial processes. It allows for better control and mitigation of potential safety risks associated with incorrect product formulations or process deviations.

 

Regulatory Compliance

With accurate density measurements, online density meters enable companies to meet regulatory requirements and industry standards. Compliance with specific density specifications ensures consistent product quality and facilitates audits and inspections.

 

Application of Online Density Meter
 

 

Concentration Determination

 

The determination of the concentration of binary solutions is one of the most important applications of density measurement. Binary solutions are mixtures of two components, such as alcohol-water solutions or sugar/water solutions. The density of a solution depends on the concentration of the dissolved substance (“solute”). If the interrelationship is known, the density of the solution can be measured and then be converted into the respective concentration. One example of a typical application is the determination of sugar content in the soft drink industry. A soft drink is considered a sugar-water solution and by density measurement the sugar content can be determined. Concentration determination is also possible if a mixture contains several components and only one of them varies while all other ingredients are constant.

High Temperature Diaphragm Sealed Differential Pressure Transmitter
High Temperature Diaphragm Sealed Differential Pressure Transmitter

Material Characterization

 

In industries like the petrochemical industry the density of a product is a very important characterization number or quality parameter. Norms including the ASTM norm define a certain density for every product, e.g. fuels, lubricating oils, or crude oils. Using density measurement these materials can be characterized and the quality of each product can be defined.

Academic Research

 

Density is also used in general as a standard parameter in professional academic research to get to know the special physical behavior of a product. In petrochemistry, scientists are used to measuring the density of gasoline at different pressures and temperatures in the laboratory to find out how it will react once injected into an engine.

High Temperature Diaphragm Sealed Differential Pressure Transmitter

 

Mass Flowmeter

Quality Control

 

Another important application of density measurement is quality control, not only in the soft drink or petrochemical industry, but also in the production of alcoholic beverages (beer, spirits, wine), fuels (including biodiesel and bioethanol), cosmetics, personal care products, pharmaceuticals, and many more.

Filling Volume Control

 

Whereas some products are quantified by their weight, others are filled, paid, or even taxed by their volume. A well-proven procedure is to measure the weight of a fluid product with a balance, followed by calculating the filling volume by using the density of the sample. This procedure is applied wherever the measurement of volumes is not possible, e.g. in the beverage industry, petroleum industry, or chemical industry.

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Fork Level Switch

 

Working Principle of Online Density Meter

The density transmitter typically consists of a measuring cell, which is a hollow tube or cylinder immersed in the fluid whose density is to be measured. The measuring cell contains a vibrating element, such as a tuning fork or a quartz crystal, which vibrates at a frequency that is proportional to the density of the fluid.
As the fluid flows through the measuring cell, it causes the vibrating element to vibrate at a different frequency, which is detected by a sensor. The sensor then converts the frequency signal into an electrical signal, which is processed and displayed as a density reading.
The density transmitter may also include temperature and pressure sensors, which allow for compensation of changes in these variables that can affect the density measurement accuracy. Overall, the density transmitter provides a reliable and accurate measurement of the density of fluids in a variety of industrial applications, such as chemical processing, petroleum refining, and food production.

 

Factors That Affect the Measurement of Density

 

 

Meters for Liquids
When using a density meter for liquids, several factors can affect the accuracy and reliability of density measurements. It is important to consider and account for these factors to ensure precise results. Here are some key factors that can influence density measurement when using a density meter for liquids:
Temperature
Temperature variations can significantly impact the density of liquids. Most density meters have temperature compensation features or require temperature inputs to adjust the density readings accordingly. It is crucial to measure and control the temperature of the liquid being tested to obtain accurate density measurements.
Viscosity
The viscosity of a liquid can affect the flow and movement of the liquid within the density meter, potentially impacting the measurement. High-viscosity liquids may require special handling or specific density meter designs capable of accommodating their properties.
Air Bubbles
Air bubbles trapped within the liquid sample can affect the density measurement. These bubbles can alter the effective volume and density of the liquid, leading to erroneous readings. It is essential to degas or remove air bubbles from the liquid before measurement, if possible.
Sample Homogeneity
The uniformity or homogeneity of the liquid sample can impact density measurements. If the liquid contains suspended particles, emulsions, or other inhomogeneous components, it may lead to inconsistent density readings. Proper sample preparation, including thorough mixing and removal of any settled particles, is necessary for accurate measurements.
Contamination
Contaminants or impurities in the liquid can introduce errors in density measurements. Foreign substances that have different densities or chemical compositions from the liquid being tested can affect the density readings. It is important to ensure that the liquid sample is clean and free from any contamination.
Calibration
Regular calibration of the density meter is crucial for accuracy. Calibration involves comparing the density meter readings against known standards or reference liquids with known densities. Proper calibration ensures that the density meter is providing reliable and accurate measurements.
Instrument Limitations
Each density meter has its own limitations and specifications. It is essential to understand the capabilities, operating range, and limitations of the density meter being used. Adhering to the manufacturer’s guidelines and instructions for proper usage is important to obtain accurate density measurements.

 

 

How to Choose an Online Density Meter?

When it comes to choosing a density meter, there are a few things that you need to consider. First of all, you need to determine the specific requirements of your applications within your industry and within your budget. Identifying the following factors will help you choose a density meter:

Oval Gear Flowmeter for Diesel Oil

 

Our Certificate
 

In order to ensure the quality of our products, our company has passed ISO9001 quality system certification, and our products have obtained CE, Exploreproof, Atex, and other certifications.

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Our Factory

Our modern factory is equipped with multiple production lines. The flow meters, liquid level meters, pressure transmitters, temperature sensors, and transmitters we produce are widely used in the petrochemical industry, natural gas, environmental engineering, pharmaceutical engineering, food engineering, water treatment, Marine engineering, and other fields.

Ultimate FAQ Guide to Flowmeters
 

Q: What is the purpose of a density meter?

A: Density meters are used to measure slurries, sludges, and other liquids that flow through the pipeline. Industries such as mining, dredging, wastewater treatment, paper, oil, and gas all have uses for density meters at various points during their respective processes.

Q: What is the difference between a hydrometer and a digital density meter?

A: Unlike digital density measurement methods, a hydrometer measurement always requires a separate temperature measurement on the sample. Some hydrometers have a thermometer already integrated. The measured result and temperature are used to manually search for the corrected value in a given table.

Q: What are the different types of density meters?

A: Commonly used liquid density meters and hydrometers include float density meters, static pressure density meters, vibration density meters, and radioisotope density meters.

Q: How to calibrate a density meter?

A: Calibration of the density meter is done by using air and ultra- pure water. As both air and water have specific density values, quality control is assured by calibrating the density meter by using the known values of each.

Q: How does density meter function?

A: A density meter comes in different varieties which include ultrasound, gravitic, microwave, nuclear and Coriolis. Each type functions differently to measure density. In ultrasonic density meter, the time taken in sending and receiving ultrasonic signals is used to measure density.

Q: What is a density transmitter?

A: A density transmitter is a device used to measure the density of a liquid or a gas. It works based on the principle of buoyancy, which states that an object immersed in a fluid experiences an upward force equal to the weight of the fluid it displaces.

Q: Does the density transmitter require frequent maintenance?

A: The density transmitter has high long-term stability without the need of zero set and maintenance. The wetted parts are all made of stainless steel (standard). The airtight welded measuring element can maintain good airtightness for a long time. The measuring element adopts a special structure design without any internal seals and the risk of leakage. Because of that, the density transmitter is not affected by atmospheric pressure fluctuations and installation heights.

Q: What is a capacitive density transmitter?

A: The capacitive density transmitter is a single and integrated unit, which requires only one tank perforation with no movable parts. In addition, the calculation for density and temperature compensation is performed in the electronic unit and does not need additional hardware, with the indications available on the field. It can be installed in tanks or in line, with a sampling vessel. Since the transmitter has a probe in permanent contact with the process fluid, especial care must be observed when used with incrusting fluids. In this case, a cleaning system should be activated for the equipment probe.

Q: What is differential pressure density measurement?

A: In density measurement of liquids with differential pressure, two pressure measuring points are mounted at a fixed distance from each other. There are thus two different pressures acting on the system. The differential pressure transducer calculates the density of the medium from the resulting pressure difference.

Q: How does an online density meter work?

A: Modern digital density meters are based on the oscillating U-tube principle. The tube, usually a U shaped glass tube, is excited and starts to oscillate at a certain frequency depending on the filled-in sample. Through determination of the corresponding frequency the density of the sample can be calculated.

Q: What is the difference between a hydrometer and a digital density meter?

A: Unlike digital density measurement methods, a hydrometer measurement always requires a separate temperature measurement on the sample. Some hydrometers have a thermometer already integrated. The measured result and temperature are used to manually search for the corrected value in a given table.

Q: Can an online density meter be used for all types of liquids?

A: Yes. Our online liquid level densitometers can be used for online density measurement of various liquid and liquid mixture. It is widely applied to the petrochemical industry, food industry, dairy industry, paper industry, chemical industry, biopharmaceutical industry and other production sites.

Q: What is the recommended frequency of recalibration/re-certification of density meters?

A: We recommend that density meters are calibrated when new, and then receive an initial recalibration after one year. Thereafter the recalibration interval really depends upon how important the measured densities are to you. Only you will know how important accurate and traceable results are to your organisation.

Q: Do you calibrate the temperature indication in my density meter?

A: If a density meter can measure sample temperature, and almost all models can, then calibration of the temperature sensor is normally the first step before calibrating the density measurement. We would normally calibrate the sensor at the same temperature as we calibrate the density measurement, but can calibrate it at different temperatures if necessary. For meters which do not contain their own temperature controller, we do this by either placing the meter in an environmental chamber or passing thermostated water through the meter.

Q: Over what density range should I have my meter calibrated?

A: The linearity of density meters differs radically for model to model (and sometimes even between instruments of the same model). We therefore recommend that the calibration range should be restricted to the density range over which the meter is used.

Q: What is the difference between a viscometer and a density meter?

A: When measuring density, these meters use a vibrating-element principle where vibrating frequency is inversely proportional to fluid density. The viscometers measure the bandwidth of the same frequency signal as densitometers to calculate viscosity of liquids.

Q: What is the resolution of an online density meter?

A: The online densitometer for high-sensitivity measurement of fluid density. High-resolution density measurement with a maximum sensitivity of 0.00025 g/cm³.

Q: Why is density important in industry?

A: Density measurement is used to specify and describe a pure substance, but also determines concentrations of binary mixtures and therefore gives information about the composition of mixtures. It is, for example, useful during quality control or helps determine the filling volume during the bottling of a product.

Q: What industries use online density meters?

A: Online density meters find applications in various industries, including oil and gas, chemical, food and beverage, pharmaceuticals, mining, water treatment, and many others.

Q: What are the advantages of using an online density meter over offline density measurement methods?

A: Online density meters provide continuous, real-time measurements, allowing for immediate process adjustments, enhanced control, and reduced manual intervention compared to periodic or laboratory-based offline density measurements.

As one of the most professional online density meter manufacturers and suppliers in China, we're featured by quality products and low price. Please rest assured to buy customized online density meter from our factory. Contact us for pricelist and quotation.

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