Level measuring devices Manufacturers online

Level measuring devices are used to measure the level of liquids, bulk goods or pasty media in tanks, silos or containers.

They are indispensable for numerous industries such as the chemical, food, water and petrochemical industries.

Below you will find the functionality, types and use of level measuring devices as well as a brief outlook on future developments:

How level measuring devices work:

Level measuring devices work according to various physical principles. The most important technologies are

Continuous or point measurement:

1. Continuous measurement gives an exact level value (e.g. in percent or liters).
2. Punctual measurement only reports whether a certain fill level has been reached (e.g. minimum or maximum).

Types of level measuring devices:

Mechanical measuring methods:

1. Rotary paddle level switch: Determines the fill level by obstructing the rotary movement of an axis fitted with paddles by liquid or debris.
2. Vibrating level switch: The obstruction of the vibration of vibrating bodies by the medium to be measured is used to determine the level.
3. Float switch: A float moves with the liquid level and transmits the value via a sensor.
4. Bubbler systems: Air is blown through a pipe in the tank, the back pressure correlates with the fill level.

Hydrostatic-based measuring methods:

1. Pressure sensors: measure the hydrostatic pressure of the liquid column and use this to calculate the fill level.
2. Differential pressure measurement: Comparison of two pressure values at different heights.

Electronic measuring methods:

1. Capacitive sensors: Use the change in capacitance caused by the medium to measure the fill level.
2. Ultrasonic sensors: Transmit sound waves and calculate the transit time to the surface of the liquid.
3. Radar/microwave measurement: Measures the reflection of radar waves for high-precision level detection.
4. Charge difference method: Uses electric fields to determine the fill level.

Optical measuring methods:

1. Light barriers: Detect the presence of liquids by the refraction or reflection of light.
2. Laser sensors: Precise measurement through laser reflection.

Use of level measuring devices:

Level gauges are essential in various industries and applications:

1. Industrial applications:
For monitoring aggressive liquids in tanks, particularly in the chemical industry.
Checking fill levels in production facilities in the food and beverage industry
Precise dosing of liquids in the pharmaceutical industry.
In the oil and gas industry for monitoring crude oil and fuel tanks.

2. Agriculture & environment:
Determining the fill levels of bulk goods in silos for grain and animal feed.
In irrigation systems for monitoring the fill levels of water reservoirs.
Measurement of water levels in sewage treatment plants and water reservoirs. in water and wastewater technology.

3. Automotive and transportation:
In motor vehicles and ships to monitor fuel levels.

Future developments in level measurement devices:

The future of level measurement lies in higher precision, better networking and more sustainability

• FMCW radar with a higher frequency (e.g. 80 GHz instead of 26 GHz) enables more precise measurements, especially in small containers.
• AI-supported signal processing for better interference signal suppression (e.g. due to foam or steam).
• Ultrasound with adaptive signal filtering to minimize measurement errors caused by environmental influences.
• LIDAR technology in optical and laser-based measuring systems enables high-precision level measurements in difficult environments.
• Multispectral sensors that use different wavelengths of light to distinguish between different materials.
• Wireless sensors (LoRaWAN, NB-IoT, 5G) for use in hard-to-access or widely distributed facilities.
• Use of biodegradable or recyclable plastics in sensors.

Level measurement devices are essential tools for monitoring and controlling production processes. The choice of the right technology depends heavily on the specific application. While mechanical methods are simple and cost-effective, modern radar and ultrasonic sensors offer high precision and reliability.

Here are the most important aspects to look out for when buying level measuring devices:

Purchasing level measuring devices requires careful planning, as choosing the wrong device can lead to measurement inaccuracies, production downtime or increased maintenance costs. Technical, economic and application-related aspects play an important role here.

• What technical requirements must the level measuring device fulfill?
• Determine the type of medium: liquid, solid, bulk material, foam or aggressive media.
• In which temperature range should the measuring device work? Some sensors are suitable for high temperatures (e.g. in the petrochemical industry) or extreme cold.
• What are the pressure conditions at the place of use? This is necessary for tanks with positive or negative pressure
• For aggressive media such as acids or alkalis, level measuring devices must be corrosion-resistant.
• Explosion protection (ATEX certification) is particularly important in the chemical and oil industries.
• Determine the required measuring range and accuracy.
• Resolution and accuracy are particularly critical in high-precision applications such as pharmaceuticals or chemicals.
• Measuring dynamics are important for applications with fluctuating levels
• Depending on the application, different measuring principles are possible:
• Mechanical: Rotary paddle level switches, vibrating level switches, floats or bubbler systems. These are suitable for simple applications and require little maintenance.
• Hydrostatic: Pressure sensors or differential pressure gauges. These devices are suitable for liquids with a constant density.
• Capacitive level measuring devices: Suitable for conductive media and pasty substances
• Ultrasonic measuring devices: The measurement is contactless, but can be influenced by foam or steam
• Radar level gauges (FMCW, guided radar): Offer high precision. They are ideal for demanding media (e.g. viscous or with turbulence)
• Optical sensors (laser, light barriers): Are well suited for clear liquids and precise bulk material measurement
• Please note acquisition costs. These vary greatly depending on the technology.
• Mechanical sensors are often cheaper and easier to install
• Also pay attention to the operating costs. Consider the energy consumption, calibration effort and costs for software integration.
• High-quality sensors with a robust design are more economical in the long term
• Consider the communication interfaces and the possibility of integration into existing systems such as SCADA, PLC or DCS systems.
• For analog signals, 4...20 mA, 0...10 V are the standard in many industrial applications.
• Digital interfaces (HART, Profibus, Modbus, Ethernet/IP) are necessary for modern Industry 4.0 environments
• Wireless sensors (IoT, LoRaWAN, NB-IoT, Bluetooth) are ideal in systems that are difficult to access.
• Depending on the industry, level sensors must meet certain standards and certifications:
• ATEX certification (explosion-protected areas).
• Hygiene certificates (food and pharmaceutical industry, e.g. EHEDG, FDA, 3-A Sanitary).
• IP protection class (e.g. IP67, IP69K for high dust or water exposure).
• SIL (Safety Integrity Level) for safety-critical applications.
• A reliable supplier not only offers products, but also good advice and service.
• Pay attention to the warranty conditions and the availability of spare parts.
• Look out for suppliers with good customer support and fast delivery times.

By following this overview, you can make an informed decision and select the right level measuring device for the intended application.

Level measuring devices can be purchased from various suppliers. Comprehensive information about manufacturers and suppliers of Level measuring devices from all over the world can be found on Exportpages.