Guided wave radar liquid level meter is a kind of high precision and high resolution liquid level measuring instrument in the chemical industry, the following is a detailed introduction:

Working principle

Guided wave radar level meter is a radar level meter based on time domain reflectometry (TDR). It emits electromagnetic pulses, which travel down a steel cable or probe (wave guide rod) at the speed of light. When the surface of the measured medium is encountered, part of the electromagnetic pulse will be reflected back, forming an echo, and return to the pulse launching device along the same path. The distance between the transmitter and the measured medium surface is proportional to the propagation time of the pulse, and the liquid level height can be obtained by calculation.

Technical characteristics

  • High precision: guided wave radar level meter adopts advanced microwave radar technology, with small error range and high measurement accuracy.
  • High stability: The instrument can maintain stable measurement performance under complex working conditions and has strong anti-interference ability.
  • Wide measuring range: suitable for continuous level measurement of various liquids, particles and slurries, with a measuring range of up to 60 meters.
  • High temperature and high pressure: It can withstand high temperature of up to 250 degrees and high pressure of 40 kg, suitable for harsh environment.
  • Explosion-proof performance: explosion-proof function, suitable for explosion danger area.

Application field

  • Petrochemical industry: Used for the measurement and control of liquid level, interface and volume in storage tanks, reactors, pipelines and other equipment.
  • Food and pharmaceutical industry: Measuring liquid levels in syrup storage tanks, bake ovens, muffin tins and other equipment.
  • Sewage treatment industry: used for sewage tank, settling tank, regulating tank and other equipment level measurement, to provide support for the automatic control of sewage treatment process.
  • Power industry: It is widely used in the liquid level measurement of reservoirs, large oil tanks and other equipment.

Precautions for use

  • Installation space: guided wave radar level gauge has certain requirements for installation space, and it is necessary to ensure that the installation position is appropriate.
  • Dielectric constant: Pay attention to the dielectric constant of the medium, and select the appropriate model according to the size of the dielectric constant.
  • Limitation of measuring range: guided wave radar liquid level meter has a blind area at the top and a blind area at the bottom, and only when the material is in between these two blind areas can the reliable measurement of the level in the tank be guaranteed.
  • Reasonable installation: To ensure long-term reliable and accurate measurement of the instrument, the guided wave radar level meter can be threaded connection, the length of the thread does not exceed 150mm, and can also be installed on the short tube. The ideal short pipe is less than 150mm in diameter and less than 150mm in height. If it is installed on a long short pipe, the cable should be fixed at the bottom or the centering bracket should be used to avoid the cable from contacting the end of the short pipe.

Advantages and Disadvantages

Advantages:

  • Measurement stability: under the condition of large fluctuations in the medium, the guided wave radar level meter is more stable than the ordinary radar level meter.
  • Wide range of application: It can be used to measure any medium with dielectric constant greater than or equal to 1.4, and it is generally used to measure media with viscosity ≤500cst and is not easy to produce adhesion.
  • Strong inhibition of steam and foam: measurement is not affected.

Cons:

  • Not suitable for measuring corrosive and adhesive liquids: Since the guided wave radar level meter is a contact measurement, the corrosiveness and adhesion of the medium need to be considered.
  • Selection and maintenance cumbersome: the length of the wave guide rod (cable) is fixed according to the working condition, and generally cannot be used interchangeably, which increases the complexity of selection and maintenance.
  • Limited measuring distance: Compared with ordinary radar level meter, guided wave radar level meter has a relatively short measuring distance.

To sum up, guided wave radar level gauge has the advantages of high precision, high stability, wide measuring range, etc., and has been widely used in many industries. However, in use, it is necessary to pay attention to the installation requirements, dielectric constant and measurement range limits and other factors, and fully understand its advantages and disadvantages to make a suitable choice.

If you want to know more about the flow meter or flow meter selection, please consult the Aister flow meter manufacturer email: sales@aistermeter.com for help.