Magnetic Level Indicators

Magnetic Level Indicators are widely used field level measurement instruments for detecting the liquid level in various towers, tanks, vessels, spherical containers, and boilers. This series of Magnetic Level Indicators offers high sealing performance, leak-proof protection, and suitability for high-temperature, high-pressure, and corrosion-resistant applications.

Magnetic Level Indicators overcome the shortcomings of glass plate level gauges, such as poor indication clarity and fragility. They provide complete measurement without blind spots, clear display, and a large measurement range. Equipped with level alarms and control switches, they can achieve upper and lower limit alarms and control of liquid levels or interfaces. With a transmitter, level and interface signals can be converted into a two-wire 4-20mA DC standard signal, enabling remote detection, indication, recording, and control.

Benefits

Featured Magnetic Level Indicators

Magnetic Level Indicator Working Principle

The Magnetic Level Indicator is a device specifically designed for liquid level measurement, ingeniously combining the principles of magnetic pole coupling and Archimedes’ principle (the law of buoyancy) with the characteristics of mechanical transmission. This level gauge can measure both the liquid level and the interface between two media of different densities.

The Magnetic Level Indicator has a cavity (called the main tube or outer shell) that houses a float. This cavity connects to the container via a flange or other interface, forming a communicating vessel. In this way, the liquid level inside the instrument’s cavity is at the same height as the liquid level in the container, so the float inside the cavity rises and falls with the rise and fall of the liquid level in the container.

When the liquid level rises, the magnetic float drives the tilting column to rotate 180°, displaying red or green. When the liquid level falls, the magnetic float drives the tilting column to rotate 180° in the opposite direction, displaying white. The height of the red (or green) band indicates the height of the measured liquid level, achieving the purpose of measuring and displaying the position of the measured liquid (interface).

Based on this, its application range has been continuously expanded, resulting in various types of products that, while detecting liquid levels, also possess more practical functions.

For example: While monitoring the liquid level, the magnetic switch signal can be used to control or alarm the liquid level; a 4~20mA transmitter is added to the existing column level gauge, so that while monitoring the liquid level on-site, the changes in the liquid level are transmitted to the control room through the transmitter sensor, cable and instrument, realizing remote monitoring and control.

Featured Applications

Magnetic Level Indicators are widely used in various liquid storage tanks, reservoirs, pools, reaction vessels, fermentation tanks, liquid ammonia storage tanks, ammonia separators, boiler drums, high and low pressure heaters, condensers, evaporators, and other pressure vessels in the petroleum, chemical, oilfield, pharmaceutical, food, and wine industries. Available materials include 304, 321, 316L, 0Cr18Ni9, 304 or 0Cr18Ni9+PTFE, 00Cr17Ni14Mo21Cr18Ni9Ti, PVC, and PP. Multiple installation options are available to suit different applications and environmental requirements.

Magnetic Level Indicators are reliable for level detection in high-temperature, low-temperature, high-pressure, highly corrosive, highly toxic, and hazardous environments. Examples include:

• Boilers: Steam drum liquid level;
• Power: Auxiliary equipment (high-pressure heater, low-pressure heater, deaerator, condenser, shaft seal heater, etc.), chemical water treatment;
• Coal chemical industry: Methanol, dimethyl ether, synthetic ammonia/urea, coal-to-olefins, coal-to-oil, coal-to-gas;
• Silicon industry: Organosilicon, polysilicon;
• Petroleum and petrochemical industry: Oil and gas extraction and gathering, refining, ethylene, trimerization, etc.;
• Fine chemicals: Methane chloride, ethylene oxide, aniline, PTMEG, BDO, carbon fiber, polyoxymethylene, acetic acid, styrene, rubber, crude benzene refining;
• Others: Metallurgy, papermaking, coking, water treatment, etc.

Typical Application 1: High Temperature and High Pressure Applications

• High-temperature and high-pressure design with all components capable of withstanding extreme pressure;
• Maximum process temperature: 538°C;
• Maximum process pressure: 42 MPa;
• Suitable for boiler drums, power plant auxiliary equipment, high-pressure hydrogenation, and similar applications.

Typical Application 2: Cryogenic Applications

• Low-temperature frost-resistant design with all components capable of withstanding high pressure;
• Minimum process temperature down to -196°C;
• Completely eliminates condensation, frost, and ice buildup;
• Suitable for ethylene and low-temperature methanol wash applications.

Typical Application 3: Specialty Material Applications

• 304/316SS+PTFE, Hastelloy C-276, Zirconium-702, Nickel-6, CPVC, etc.;
• Wide range of temperature, pressure, and corrosion resistance; high application parameter ratings;
• Suitable for acetic acid, acetic anhydride, chlor-alkali chemical processing, and similar operating conditions;

Typical Application 4: Integrated Application

• Integrated application with level transmitter/switch;
• Simultaneously achieves local indication and remote signal transmission;
• Eliminates multiple process interfaces;
• Reduces product and maintenance costs;

More Level Measurement Solutions

The Magnetic Level Indicator offers diverse output signals, enabling long-distance liquid level indication, detection, control, and recording. Sino-Inst continuously upgrades its Magnetic Level Indicator technology and improves its manufacturing processes, expanding the application areas and scope of this level gauge.

If you require a customized liquid level measurement solution, please feel free to contact our sales engineers.