Material Level Indicators

The material level indicator refers to an instrument for real-time detection of changes in the height of solid materials in a container. Material level indicator is also known as material level transmitter, material level controller, material level meter, etc.

Level measurement usually refers to the detection of the height of materials (solid or liquid level) in closed or open containers during industrial production. Instruments that accomplish this measurement task are called level gauges. Level measuring instruments are used to monitor liquid or solid material levels. Includes slurries and granular solids.

Material Level Indicators

Material Level Monitoring

Level measuring instruments are industrial automation instruments that measure the liquid level and loading height of liquid and powdery materials. Measure the stacking height or surface position of solid materials such as lumps, granules and powders.

Material Level Monitoring is the measurement of the surface position of solid blocks or powders in a silo to understand the amount of material stored in the silo.

for example:
In thermal power plants, it is necessary to detect the position of coal lumps and pulverized coal in the raw coal hopper and pulverized coal bunker.

Featured Material Level Indicators

The requirements for measuring the level of bulk materials are increasing. Reliable level sensors achieve the required measuring accuracy in all areas of the process chain. Depending on the position, the standard level gauge can be individually configured, making it suitable for various applications.

The measurement of fine powders in the chemical industry is as reliable as the measurement of sand and gravel or the measurement of plastic particles in the construction industry.

A variety of different bulk materials are commonly used in steel production. Material level information facilitates accurate material management and avoids conveyor congestion and feed hopper overflows. This prevents material loss, delays and additional costs.

In general, simple material level information obtained by optical distance sensors or ultrasonic sensors is sufficient.

Extended reading: GWR Solid Level Sensor-for Cement silo-Ash powder measure

The Rotary paddle bin level indicator is based on the principle of rotating machinery. The motor-driven paddles rotate continuously at a standard rotation speed of one revolution per minute.

The increasing bulk material in the silo or container buries the paddles. This blocks the rotation and generates a counter-torque.

This reactive torque turns the built-in rotatable motor out of its original position and signals the switch via the switch arm to open the switch.

The second switch delays cutting power to the motor.

If the level drops again, the paddles are exposed, and the spring will spring the motor back to its original position.

At this time, the motor is powered on and then sends out an output signal. The paddles begin to spin continuously again.

Extended reading: Radar Level Sensor Working Principle

The drying process usually consists of four stages: filling, drying, cooling and draining.

In order to realize media visualization and process automation. The material level of the silos storing wet bulk materials, storage vessels, static layer dryers and circulating dryers must be continuously controlled and monitored.

In storage containers, static layer dryers and circulating dryers. The level switch is used as a full warehouse alarm.

When the material reaches the preset level, the conveying device is automatically closed.

In the wet material or dry material storage container, the opposite is true. The level switch can be used as an empty warehouse alarm and a full warehouse alarm.

In particular, the empty silo alarm requires a sturdy structure of the paddle and is equipped with a protective tube. This can prevent the empty silo material level alarm from being damaged when the silo material falls.

The conveyor for filling the drying containers is powered on via the empty bin alarm. The empty bin alarm also controls the operation of the dryer. The full warehouse alarm will cut off the power supply of the conveying device when the material reaches the allowable level.

Extended reading: Amazing Solutions for Continuous Liquid Level Measurement

The cement silo material level indicator is mainly used for automatic detection and control of the limit material level of various materials (such as powder, granule or block). Different types of material level indicators can meet the requirements of different working conditions. In metallurgy, Grain, flour, building materials, cement, electric power, coal, chemical industry, foundry, rubber, environmental protection dust removal and other industries have a wide range of applications in the process of material transportation and control.

Extended reading: Float Level Sensors – Single and Multipoint

Cement Silo Level Measurement

Cement silo seems to be a simple supporting equipment for concrete mixing plant. In fact, it also contains many auxiliary devices. It is not just a simple silo. It also includes auxiliary devices such as dust collector, arch breaking device, pressure safety valve, Level meter, etc.

The material level meter is mainly used for automatic detection and control of the limit material level of various materials such as cement and fly ash. It is indispensable. What does it do?

The material level meter is a sensor used to sense the height change of the material in the container. It can continuously detect the height, volume and other values ​​of the material in real time and convey relevant information to the computer or display instrument.

In the concrete mixing plant, the cement silo is a closed material storage device. The user cannot intuitively understand the amount of powder in it. At this time, a material level meter is needed.

Simply put, the material level meter in the cement silo can accurately record the position of the material in the cement silo, which is convenient for management.

After understanding the function of the level meter, what are the characteristics of the level meter?

  1. Anti-interference, ready to use:

Because there are no complicated electronic components and their amplifying circuit parts inside. Therefore, the level gauge is not subject to any electromagnetic wave interference. After installation, it can be used for a long time without any debugging and maintenance.

  1. Super anti-shake performance design:

There are no false signals even when the material is flowing.

  1. Shock resistance and anti-loosening structure design. Effectively avoid loosening and slipping of parts. High-quality stainless steel material is used to make it have excellent corrosion resistance and wear resistance.
  2. The material level meter adopts contact measurement. The result is real, accurate and reliable. It can be installed horizontally, inclined and vertically. It is easy to install and use.
  3. Material level display function:

Adopt long-life high-brightness indicator light. The material level display is intuitive and convenient.

  1. Excellent measurement reproducibility and adaptability to environmental conditions:

That is, it is not affected by changes in material particle size, shape, specific gravity, medium, wall scale, adhesion, temperature, humidity, dust concentration, etc.

  1. Double protection function:

The overload protection function prevents the blades from being damaged by excessive external force. The automatic protection function enables the material level device to be powered off when the rotation of the material blades is blocked in the silo, which protects the motor and effectively prolongs its service life.

Extended Reading: Silo/Bin material level measurement system

The Difference Between Material Level Indicator and Level Switch

First of all, the concept of Material Level Indicator and Level Switch is different.

Broadly speaking, Material Level Indicator is divided into two types: switch type and continuous type. It means that Material Level Indicator includes level switch.

In a narrow sense, the Material Level Indicator can detect the material level change in the container in real time, and can achieve continuous measurement. The material level switch only has the function of switching value, which can only monitor and control the point position, and cannot achieve continuous measurement.

Of course, in general, the instruments for continuous measurement use the naming method of Material Level Indicator. Most of the instruments for switching values use the naming method for level switches.

Secondly, the products covered by Level Switch and Material Level Indicator are different.

Divide from a narrow concept.

The material level switch mainly includes vibrating rod material level switch, resistance rotary material level switch, tuning fork material level switch, radio frequency admittance material level switch, etc.

Material Level Indicator mainly includes Ultrasonic Material Level Indicator, Radar Material Level Indicator, Ray Level Indicator, etc.


There are many different types of level indicators, each with its own application.

Use level indicators to detect and measure the level of liquids in tanks. Standard technologies used to measure liquid level include floats, pressure or depth sensors, ultrasonic detection and conductivity level measurement, and radar measurement.

Some other reference level indicators are tubular level indicators, float and plate level indicators, sight flow indicators, window sight flow indicators, pressure gauges and bi-color indicators. Some level indicators have multiple functions. Examples include built-in controllers, continuous output measurements and adjustable alarm switches.

Different types of liquid level indicators have different working principles. For example, we simply say radar level gauge.

Radar level gauge is a measuring instrument based on the principle of time travel. Radar waves travel at the speed of light, and the run time can be converted into a level signal by electronic components. The probe emits high frequency pulses that travel along the cable probe. When the pulse hits the material surface, it is reflected back and received by the receiver inside the meter. And convert the distance signal into a level signal.

Extended reading: Hydrostatic Level Measurement

Point level control should refer to a way of liquid level control circuit. By setting a control point to control the main working electrical (water pump or electric valve, etc.) to start (open) or stop (close) at this liquid level control point.

Extended reading: RF Admittance Level Sensor

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Sino-Inst offers over 20 Material Level Indicators for level measurement. For detecting high, intermediate, or low levels of liquids, powders and free flowing granular solids stored in tanks, bins, silos or other containers. About 50% of these are Radar level meters, 40% is other tank level sensor.

A wide variety of Material Level Indicators options are available to you, such as free samples, paid samples.

Sino-Inst is a globally recognized supplier and manufacturer of Material Level Indicators instrumentation, located in China.

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About KimGuo11

Wu Peng, born in 1980, is a highly respected and accomplished male engineer with extensive experience in the field of automation. With over 20 years of industry experience, Wu has made significant contributions to both academia and engineering projects. Throughout his career, Wu Peng has participated in numerous national and international engineering projects. Some of his most notable projects include the development of an intelligent control system for oil refineries, the design of a cutting-edge distributed control system for petrochemical plants, and the optimization of control algorithms for natural gas pipelines.