Level Transmitters

Level transmitters and level sensors are designed to monitor liquid levels in tanks, pipelines, and other process systems. Generally, they can be classified into two types: submersible level sensors and contactless level sensors. MicroSensor offers solutions for both types.

Submersible level sensors and transmitters provide continuous liquid level measurements by sensing the hydrostatic pressure generated by the height of the liquid above the sensor. They deliver output in the form of analog or digital signals. On the other hand, contactless level sensors employ radar or ultrasonic technology to measure liquid levels without direct contact, ensuring accurate and reliable readings.

Hydrostatic Level Measurement Principle

Hydrostatic measurement is level measuring based on the static pressure effect of a stationary liquid. No matter what shape the container is, the static pressure at the measuring point of the container is always proportional to the height of the liquid under the action of gravity. Therefore, the submersible level transmitters must placed at the bottom of the container to get accurate level measurements.

• Utilizing corrosion-resistant materials and firm structure, so as to operate under high pressure, high temperature and high corrosiveness conditions.

• Directly contact the liquid due to the sealed waterproof design, proving reliable and accurate liquid level measurement.

• Small size, easy to installation and calibration.

• For submersible level sensors which contact with the medium directly, physical properties such as conductivity, dielectric constant, or viscosity don't affect the measurement result.

• Level measurement is not affected by the geometry of the container and existing equipment.

How to Choose the Most Suitable Liquid Level Transmitter?

• Liquid Type: Different liquid types have different requirements for the materials of transmitter. For example, the acid liquid requires anti-corrosive materials. However, the high-temperature liquid requires high-temperature resistant materials. Therefore, such as viscosity, density, corrosiveness, and temperature before choosing the transmitter.

• Accuracy and Stability: These are the critical specifications of the liquid level transmitters, ensuring stable operation and process connection. 

• Measurement Range: Different hydrostatic level transmitters have varying measurement ranges. If the selected transmitter's measurement range does not match the actual requirements, it is impossible to accurately measure the liquid level. Therefore, it is necessary to choose a transmitter with an appropriate range to ensure accurate readings.

• Output Signal and Communication Protocol: Some applications require analog signal output, such as 4-20mA or 0-10V, while others require digital level transmitters, such as RS485 or Modbus. Moreover, some applications require liquid level transmitters to have remote monitoring and control capabilities, so as to support certain communication protocols, such as HART. Therefore, the output signal and communication protocol need to be considered when selecting a liquid level transmitter. It aims to meet the actual requirements.

• Installation Conditions: Available space, and installation options also need to be considered. Because some transmitters require specific installation methods or configurations, which may impact your selection.

• Cost: Identify your core needs before selecting, reducing the cost as soon as possible.

By carefully assessment these factors, you can choose the most suitable liquid level transmitter for your specific application, ensuring accurate and reliable measurement and optimal process control. If you have any questions, please feel free to consult Micro Sensor at any time.

What are the Typical Applications of Level Transmitters?

The main media MicroSensor level sensors and transmitters can measure water, oil, diesel, chemicals, etc. Level sensors are widely used for liquid measure and control in petroleum, chemi-industry, power stations, agriculture, city water supply, drainage, and hydrology.  

• Water Treatment: Level transmitters are used for water level monitoring, flow control, and liquid level alarming. 

• Oil and Gas Industry: Level transmitters are used to monitor and control the liquid levels in oil tanks, natural gas tanks, separators, and other containers in the oil and gas industry.

• Food and Beverage Industry: Level transmitters are used to monitor and control the liquid levels in storage tanks, fermentation tanks and transmission pipelines in food and beverage industry.

These are just a few instances among various applications. Level transmitters exist everywhere, which sustain the normal operation of many industries.

Types of Level Sensors from MicroSensor

MicroSensor offers level measurement with submersible type and contactless type.

Submersible level transmitters, also known as level probes, are usually immersed directly into the bottom of the tested liquid container. The measured static pressure allows calculation of the liquid level, that is, the height of the liquid column above it. Durable, reliable, and easy to install make submersible pressure transmitters ideal for tanks and wells level or pressure measurement.

Contactless level sensors include radar and ultrasonic. Radar level sensors send microwave signals to the measured medium surface. The ultrasonic type emits high-frequency sound waves. Both distance calculations use the speed of the wave and the taken time to reflect to the sensor. The non-contact design lever sensor expands the compatibility of the measured medium. 

Please don't hesitate to contact our technicals to guide you on how to choose the right level sensor in your specific industrial applications. We commit to ensuring accurate measurements and optimizing your operations in various industrial applications.