A level transmitter is used to measure the level of a liquid in an open or closed tank. It works by sending out a signal proportional to the fluid level and then measuring this signal with its sensing element. Level transmitters come in various types, including submersibles, pressure transducers, hammer unions, and digital pressure gauges.
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01
Our Product
We offer a range of products, including ultrasonic liquid level meters, electromagnetic flow meters, open channel flow meters, and online water quality analyzers. Our analyzers include online pH meters, dissolved oxygen meters, conductivity meters, turbidity meters, sludge concentration meters, and sludge interface meters. Additionally, we provide pressure transmitters and input level gauges.
02
Product Application
Dongyi is a high-tech company that manufactures industrial instruments. Our products are used in many fields, such as environmental protection, chemical processing, printing and dyeing, pharmaceuticals, water treatment, municipal engineering, and tap water systems.
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Our Certificates
We hold several certifications, including utility model patents, design patents, software works, and quality management system certifications.
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Production Equipment
Our production facilities are equipped with advanced tools, including ultrasonic and radar testing devices, laser welding equipment, flow calibration devices, pressure debugging equipment, high and low temperature aging boxes, and circuit aging devices.
Advantages of Level Transmitters
Simple installation, convenient use, and strong interchangeability.
Suitable for measuring the liquid level and interface of liquid media in containers. In addition to on-site instructions, it can be equipped with remote transmitters, alarm switches, and comprehensive detection functions.
The indication is novel; the readings are intuitive and eye-catching. The direction of the observing indicator can be changed according to user needs.
The measurement range is large and is not limited by the height of the storage tank.
The indicating mechanism is completely isolated from the measured medium, ensuring good airtightness, high reliability, and safe use.
The structure is simple, installation is convenient, maintenance is easy, and it is corrosion-resistant, requires no power supply, and is explosion-proof.
The high-quality sensor offers high sensitivity and fast response speed, accurately reflecting subtle changes in both flowing and static liquid levels, resulting in high measurement accuracy.
With intrinsically safe explosion-proof and isolation explosion-proof capabilities, it can be used in various hazardous locations. The anti-clogging design enables the measurement of liquid levels in paste media.
Three indicator heads with 100% equal scale—LED and LCD—provide convenient reading on-site.
The 4-20 mA DC two-wire signal transmission has strong anti-interference capability and allows for long transmission distances.
Fine and unique zero-point calibration, full-range, and nonlinear compensation ensure accuracy within the operating range and provide good long-term stability.
The pressure sensor directly measures liquid level pressure and is unaffected by bubbling and deposition of the medium.
Types of Level Transmitters
There are seven types of level transmitters, each useful for different processes.
Liquid Level Transmitters:
Liquid level transmitters detect the levels of liquids and can also detect interfaces between liquids, such as oil and water. You will find liquid level transmitters in storage, transport, and water storage tanks. These transmitters measure the level by assessing the head pressure of the liquid.
Ultrasonic Level Transmitters:
Ultrasonic transducers, mounted at or near the top of a container, use an ultrasonic pulse. The pulse hits the surface of the liquid and reflects back. The sensor then calculates the fill level based on the time between the transmitted and received signals.
Capacitance Level Transmitters:
The principle of capacitive level measurement is based on changes in capacitance. An insulated electrode acts as one capacitor plate, while the tank wall acts as the other. The capacitance depends on the fluid level; an empty tank has lower capacitance, while a filled tank has higher capacitance. By measuring variations in capacitance, these transmitters calculate the fill level of the tank.
Hydrostatic Level Transmitters:
A hydrostatic level sensor measures the hydrostatic pressure in a liquid at a predetermined depth. Hydrostatic level sensors gauge fluid levels by assessing the pressure exerted by the body of liquid within the vessel. The greater the volume of liquid, the greater the pressure.
Magnetic Level Transmitters:
These transmitters use a magnetic object suspended in a buoyant float. This type of transmitter is suitable for continuous measurement, as the float rises and sinks with the liquid level. By combining buoyancy principles with magnetism, magnetic level transmitters can be adapted for almost any process.
Radar Fill Level Transmitters:
These transmitters operate on the principle of radar, utilizing electromagnetic waves in the 10 GHz range within the microwave X-band bandwidth. Mounted at the top of a tank filled with liquid, the transmitter sends a radar signal into the liquid and receives a reflection of that signal. The transmitter then analyzes the current fill level of the tank based on the time taken for the transmitted signal to return.
Guided Microwave Level Transmitters:
These transmitters send a microwave pulse through a sensor cable or rod. The signal hits the surface of the liquid and travels back to the sensor. The electronics integrated into the transmitter housing determine the fill level based on the time taken for the signal to travel down the sensor and back.
How Does a Level Transmitter Work?
Irrespective of the type of level transmitter, the basic principle remains the same. A level transmitter typically consists of a sensor, an electronic circuit, and an output display. The sensor, as per the type, collects data regarding the liquid level and converts it into an electrical signal.
In the case of ultrasonic transmitters, the sensor emits sound waves and receives their reflection. For radar transmitters, the sensor emits microwave signals and measures the time taken for their reflection. Capacitance transmitters measure changes in electrical characteristics, and buoyancy transmitters detect the buoyancy force. Differential pressure transmitters measure the pressure difference.
The electronic circuit in the level transmitter processes the electrical signals received from the sensor, compensates for variations such as temperature changes, and converts them into a linear measurement. This measurement is then displayed on an output display, providing users with real-time information about the liquid level.
Level transmitters are integral components in industries where continuous and accurate monitoring of liquid levels is vital for process optimization, safety, and regulatory compliance. In the oil and gas sector, level transmitters are utilized in storage tanks, process vessels, and pipelines to provide real-time level measurements for inventory management, custody transfer, and leak detection applications. The accurate level data obtained from transmitters enables operators to optimize storage and distribution operations while ensuring compliance with safety and environmental regulations.
Similarly, in the chemical processing industry, level transmitters play a critical role in monitoring and controlling the levels of various liquids in reactors, storage tanks, and processing vessels. The precise level measurements provided by transmitters enable operators to maintain optimal process conditions, prevent overfilling or emptying, and ensure the safe and efficient handling of chemical substances.
Level transmitters are used to measure the level of a liquid or solid in a tank or other container. They are used in a variety of industries, including oil and gas, water and wastewater, and chemical processing. Level transmitters provide accurate and reliable measurements of the level of a material, which can be used to control processes, monitor safety, and optimize operations.
Routine Maintenance and Installation Attention for Pressure Transmitters
Routine Maintenance of Pressure Transmitters
1.Consult with the pressure transmitter manufacturer’s on-duty staff to understand the operation and display of the instrument, and clean any debris in the protection box promptly.
2.Identify and address loose wiring and fasteners as needed, regularly clean the exterior of the pressure transmitter, and apply anti-corrosion treatment to the pressure guiding pipe and root valve.
3.Check whether the indication of the pressure transmitter is consistent with that of the on-site pressure gauge and secondary gauge.
4.Inspect the pressure transmitter (including the pressure guiding pipe and valve) for leaks, damage, and corrosion.
5.Address any problems found promptly, and maintain records of patrol inspections.
6.Implement waterproof and shockproof measures for the pressure transmitter.
7.In winter, take antifreeze and insulation measures for pressure transmitters, pressure guiding pipes, and related equipment to ensure accurate readings.
Safety Precautions for Pressure Transmitters
1.When disassembling, installing, or adjusting a pressure transmitter with an interlocking device, the interlocking device must be removed first to prevent accidents.
2.For pressure transmitters installed in toxic and hazardous locations, all harmful substances must be completely removed before maintenance, or the instrument should be removed and transported to a safe area for servicing.
3.When overhauling pressure transmitters used for oxygen and other oil-free measuring media, ensure that the exhaust valve of the pressure transmitter is free of oil.
4.Highly corrosive media or media with overheated steam temperatures should not come into direct contact with the pressure transmitter; isolation measures should be implemented.
5.Prevent slag and other fine particles from settling in the pressure guiding tube and blocking the pipeline.
6.When measuring steam or other high-temperature media, the working temperature of the pressure transmitter should not exceed 85°C. If it does, a condensation ring must be installed, and the condensation ring should be filled with condensed water to prevent the pressure transmitter from coming into direct contact with the steam. A condensation tank may be added if necessary.
How to Choose a Level Transmitter
Understanding the different types of level transmitters is crucial for making an informed choice. The most common types include ultrasonic, radar, capacitance, and pressure transmitters. Each type has its own set of advantages and limitations, and the right choice depends on factors such as the substance being measured, the operating environment, and the required level of accuracy.
Understanding the Different Types of Level Transmitters
Ultrasonic level transmitters operate by using sound waves to measure the distance to the surface of the substance in the tank. They are suitable for a wide range of applications and can measure both liquids and solids. However, they may not be suitable for applications where there are obstructions or foam on the surface.
Radar level transmitters use microwave signals to measure the distance to the surface of the substance. They are highly accurate and suitable for various applications, including those with obstructions or foam. However, they can be more expensive than other types.
Capacitance level transmitters function by measuring changes in capacitance between the probe and the tank wall as the level of the substance changes. They are appropriate for measuring a wide range of substances, including liquids, powders, and granular materials. However, they may not be suitable for substances with low dielectric constants.
Pressure level transmitters measure the pressure exerted by the substance in the tank to determine the level. They are suitable for measuring liquids and are often used in applications where temperature and pressure conditions are extreme. However, they may not be suitable for measuring solids or in applications with high levels of vibration.
Considering the Operating Environment
When selecting a level transmitter, it is essential to consider the operating environment. Factors such as temperature, pressure, and the presence of corrosive substances can impact the performance and reliability of the device. For example, in applications with high temperatures, it is crucial to choose a level transmitter with an appropriate temperature rating to ensure reliable operation.
In corrosive environments, it is vital to select a level transmitter made from materials that can withstand the corrosive substances. For instance, in applications with acidic substances, it is important to choose a level transmitter made from materials such as stainless steel or PTFE to prevent corrosion and ensure long-term reliability.
It is also necessary to consider the presence of obstructions or foam in the tank when choosing a level transmitter. For example, in applications with foam on the surface, it is important to select a level transmitter that can accurately measure the level despite the foam.
Accuracy and Range
The accuracy and range of a level transmitter are crucial factors in choosing the right one for your application. Accuracy refers to how close the measured value is to the actual value, typically expressed as a percentage of the full scale. Range indicates the maximum and minimum levels that can be accurately measured.
When selecting a level transmitter, consider the level of accuracy required for your application. For example, in applications where precise measurements are essential, such as in chemical processing plants, a high level of accuracy is necessary. Conversely, in applications where a lower level of accuracy is acceptable, such as in wastewater treatment plants, a transmitter with lower accuracy may suffice.
The range of a level transmitter is also an important consideration, as it determines the maximum and minimum levels that can be accurately measured. It is crucial to choose a level transmitter with a range suitable for your application. For example, in applications where the level of the substance fluctuates widely, selecting a level transmitter with a wide range will ensure accurate measurements across the full range.
Integration and Compatibility
Another important factor to consider when choosing a level transmitter is its integration and compatibility with existing systems. It is essential to select a level transmitter that can be easily integrated with other systems, such as control systems and data acquisition systems, to ensure seamless operation and data management.
Our Factory
Zhejiang Dongyi Technology Co., Ltd. was formerly known as Hangzhou Tuosheng Automation Instrument Co., Ltd. "TUOSHENG" was founded in 2010. It has been deeply involved in the industrial instrument industry for more than ten years and has profound technical accumulation. Dongyi Company was built by the original team of "Tuosheng" and its headquarters is located in the beautiful paradise on earth - Hangzhou, Zhejiang. In 2023, the company began to prepare for international cross-border business, and registered and established Hangzhou Dongyi Import and Export Co., Ltd. in 2024 to enter the international market.
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