Radar Level Gauge

Principle

Emission—Reflection—Reception

The antenna of the radar sensor emits electromagnetic wave signals in the form of a beam, and the emitted waves reflect on the surface of the tested material. The reflected echo signal is still received by the antenna.

Each point in the transmitting and reflecting beams is collected using ultrasonic sampling method. The signal is processed by an intelligent processor to obtain the distance between the medium and the probe, and sent to the terminal display for display, alarm, operation, etc.

Features

The biggest feature of radar level gauges is the significant effectiveness under harsh conditions. Radar level gauge can measure toxic medium, corrosive medium, solid, liquid, dust, slurry medium. Radar level gauge is featured in:

1. Continuous and accurate measurement

The probe of radar level gauge has no contact with the surface of the medium and belongs to non-contact measurement. Radar level gauge can accurately and quickly measure different medium. The probe is almost unaffected by temperature, pressure, gas, etc.

2. Capable of suppressing interference echoes

3. Accurate, safe, and energy-saving

The radar level gauge uses materials with stable chemical and mechanical properties, and the materials can be recycled, making it highly environmentally friendly.

4. No need for maintenance and strong reliability

Microwaves are almost undisturbed and do not come into direct contact with the measuring medium, making them suitable for various applications such as vacuum measurement, liquid level measurement, or material level measurement.

Due to the use of superior materials, the radar level gauge is durable under extremely complex chemical and physical conditions, and can provide accurate, reliable, and long-term stable analog or digital level signals.

5. Easy to maintain and operate

The radar level gauge has fault alarm and self diagnosis functions. Based on the error codes prompted by the operation display module, the analyze faults can be promptly identified and troubleshoot, making maintenance and correction more convenient and accurate, and ensuring the normal operation of the instrument.

6. Widely applicable for almost all medium

From the shape of the tank, the radar level gauge can measure the liquid level of spherical tanks, horizontal tanks, cylindrical tanks, cylindrical vertebral tanks, etc;

From the perspective of tank function, the radar level gauge measure the liquid level in storage tanks, buffer tanks, microwave tubes, and bypass pipes;

From the perspective of the tested medium, the radar level gauge measure liquids, particles, slurries, etc.

Guided Wave Radar Level Gauge

Principle

Guided wave radar level gauge is a measuring instrument based on the principle of time travel. The radar wave operates at the speed of light, and the operating time can be converted into a level signal through electronic components.

The probe emits high-frequency pulses and propagates along the cable probe. When the pulse encounters the surface of the material, it reflects back and is received by the receiver inside the instrument, converting the distance signal into a level signal.

Features

Strong inhibition ability to steam and foam, and the measurement is not affected;

Not affected by liquid density, porosity of solid materials, temperature, and dust during feeding;

Low maintenance, high performance, high precision, high reliability, and long service life.

What’s the difference between Radar Level Gauge and Guided Wave Radar Level Gauge?

Difference 1: Different contact methods

The radar level gauge is non-contact type, while the guided wave radar level gauge is contact type.

That is to say, guided wave radar level gauges cannot be used under situations with high food grade requirements.

Difference 2: Different applicable working medium

Guided wave radar level gauges require more consideration of the corrosiveness and adhesion of the medium, and the installation and maintenance are more difficult for excessively long guided wave radars.

Under low dielectric constant conditions, both radar and guided wave radar measurement principles are based on the difference in dielectric constant of the medium.

Due to the divergence of waves emitted by ordinary radar, the signal is weak and the measurement is unstable when the dielectric constant of the medium is too low. On the other hand, guided wave radar waves propagate along the guided wave rod, resulting in relatively stable signals. In addition, general guided wave radars also have a bottom detection function, which can be corrected based on the measured values of the bottom echo signal, making the signal more stable and accurate.

Difference 3: Different selection options

Ordinary radars can be used interchangeably, while guided wave radars cannot be used interchangeably due to the fixed length of the guided wave rod (cable) according to the original working conditions. As a result, the selection of guided wave radars is more complicated than ordinary radars.

Difference 4: Different measurement ranges

Ordinary radar level gauge is commonly used on tanks of 30m and 40m, and can even measure up to 60m.

Guided wave radar needs to consider the force situation of the guided wave rod (cable). Due to the force, the measurement distance of guided wave radar is generally not very long.

However, in some special working conditions, guided wave radar has obvious advantages, such as stirring in the tank and large medium fluctuations. In such conditions, the measurement value of guided wave radar fixed at the bottom is more stable than that of ordinary radar;

There is also level measurement inside the small tank. Due to the small installation measurement space (or the large amount of interfering substances inside the tank), ordinary radars are generally not suitable. In this case, the advantages of guided wave radars become apparent.

Difference 5: Different styles

The radar level gauge is in the shape of a horn, while the guided wave radar level gauge has a guided wave rod. Two different shapes naturally have differences in some usage scenarios.

Xi'an Huashun external liquid level gauge can achieve non-contact measurement and is widely used in fields such as petroleum, chemical, pharmaceutical, electric power, ships, fire protection, etc. It has become a qualified material supplier for the three major oil companies of CNPC, Sinopec, and CNOOC.