German HYDAC level gauge FSA-381-1X/12

German HYDAC level gauge FSA-381-1X/12

Hedeke level gauge refers to an instrument that detects real-time changes in the height of solid materials in a container.

Hedeke level gauge is also known as level transmitter, level controller, level gauge, level meter, etc.

Hedeke level gauge level detection method

Measure the surface position of solid blocks or powders in the storage warehouse to understand the quantity of substances stored in the warehouse.

In thermal power plant, it is necessary to detect the position of coal and pulverized coal in raw coal hopper and pulverized coal bunker.

In the past, simple heavy hammer level gauges were commonly used to detect material levels, but now automatic heavy hammer level gauges, nuclear radiation level gauges, and ultrasonic level gauges are used to detect material levels.

Particle size detection plays an important role in the automation process of modern coal preparation plants. It is possible to estimate the volume or weight of the material stored in the container, maintain it at a certain height as required, or alarm its upper and lower limit positions, continuously monitor or adjust the balance of incoming and outgoing materials in the container.

The commonly used instruments for automatic continuous detection of coal bunker levels in coal preparation plants are electrode type, ultrasonic type, heavy hammer type, microwave type, and weighing type level gauges.

Common types of level gauges in Hedeke

Automatic heavy hammer detection level gauge

It consists of a servo motor, a steel wire rope suspended with a heavy hammer, a material level signaling device, and a display instrument with a microcomputer. After starting, the microcomputer sends a signal to lower the hammer, and the servo motor rotates to lower the hammer. When the hammer touches the material surface, the transmitter sends a signal to the microcomputer to stop the hammer from descending and send a signal to raise the hammer. The motor reverses to raise the hammer and sends the material level signal value to the display instrument.

After the heavy hammer rises to the top of the warehouse, the motor stops running, and after a delay, the above action is repeated. There are also devices such as upper and lower limit alarm signals on the display instrument.

Nuclear radiation type

The level gauge measurement system is shown in the diagram. The lower side of the storage bin is equipped with a gamma ray radiation source, and the upper side of the storage bin is equipped with a gamma ray receiver. As the height of the material surface changes, the intensity of the gamma rays passing through the material layer also varies. The receiver detects the intensity of the injected gamma rays and displays the height of the material level through a display instrument.

Ultrasonic level gauge

The top of the storage bin is equipped with an ultrasonic generator and receiver facing the material surface. The ultrasonic waves emitted by the generator are reflected after passing through the air layer and reaching the material surface, with a portion of the reflection being received by the receiver.

The height of the material level can be calculated by multiplying the time taken from ultrasonic emission to reception by the speed of sound. Due to the influence of air temperature on the propagation speed of sound waves, it is necessary to measure the air temperature to correct the sound velocity.

Ultrasonic level gauges are suitable for measuring the level of bulk materials with larger particle sizes.

Hedeke level gauges are widely used in industries such as petrochemicals, plastics, cement, pharmaceuticals, feed, food, metallurgy, light industry, building materials, environmental protection, etc., to achieve upper and lower limit alarm and control of level.

The advantages and disadvantages of common level gauges are as follows:

Resistance rotary level gauge

Advantages: More reliable;

Limitations: Not durable.

Capacitive level gauge

Advantages: More durable;

Limitations: Poor reliability.

Permanent magnet level gauge

Advantages: Reliable, sensitive, and durable;

Limitations: Vertical installation is required.

Ultrasonic level gauge

Advantages: Non contact.

Limitations: Dust impact/uneven surface impact/non-contact noise;

radar level gauge

Advantages: Non contact.

Limitations: dielectric constant requirements/dust influence/uneven surface influence;

Recommendation: Use a four wire radar with high transmission frequency

Guided wave radar level gauge

Advantage: Measurement of a certain point.

Limitations: dielectric constant requirements/hanging/tensile effects;

Laser level gauge

Advantages: Non contact

Limitations: Dust impact/uneven surface impact

RF admittance level gauge (capacitive level gauge)

Advantages: Point contact

Limitations: dielectric constant requirements/time drift/temperature drift/hanging/tension;

Recommendation: It is recommended to use imported products

Heavy hammer level gauge: divided into cable and belt types

Advantages: Direct measurement/manual control

Limitations: Traditional cable type heavy hammers are prone to breakage, burial, and tangled ropes

Recommendation: Belt Hammer

X-ray level gauge

Advantages: Non contact, stable

Limitations: Pollution/high prices

Weighing type level gauge

Advantages: Can measure mass/volume

Limitations: Seismic issues/Unknown material surface condition/High price

German HYDAC level gauge FSA-381-1X/12