Liquid level measurement is an important link in process industry, involving production efficiency, product quality, safety and environmental protection. There are a variety of common liquid level measuring instruments on the market, of which 80 ghz radar level transmitter and external level meter are two more popular non-contact measuring technologies. This paper introduces the working principle, technical characteristics, performance differences and application scenarios of these two instruments, analyzes their advantages and disadvantages and adaptability in different working conditions, and provides a reference basis for users to choose suitable liquid level measuring instruments according to working conditions.

80GHz radar level gauge

The 80GHz radar liquid level meter is a kind of instrument that uses the microwave signal reflection principle to measure the liquid level. The operating frequency is 80GHz and the beam Angle is 3°, which can realize the measurement of high precision and high reliability. The 80GHz radar level meter has the following features:

- High precision level measurement instrument can be carried out in metering handover applications, with relevant certifications from independent testing bodies, such as international explosion-proof certificates, overflow protection certifications WHG, SIL, class certifications, etc.

- Can avoid interference inside the tank, such as pipes or baffles, improve measurement reliability. Due to the small beam Angle, the radar wave can be better focused on the measured medium, reducing signal loss and error.

- Can achieve a larger range, up to 30m. Compared with other technologies, the measurement range can be expanded under the premise of ensuring the same measurement accuracy.

- With high IT security standards, can effectively prevent network attacks. The 80GHz radar level meter uses advanced data encryption and communication protocols to ensure data security and integrity.

External type liquid level gauge

External type liquid level meter is a kind of instrument that uses ultrasonic or capacitance principle to measure liquid level, which is installed on the outside of the tank without direct contact with the measured medium. The external level gauge has the following features:

- Easy installation, no need to perforate or weld the tank, reducing installation costs and risks. The external level gauge only needs to fix the sensor on the outside of the tank.

- No direct contact with the measured medium, low maintenance cost. The external type liquid level meter will not be affected by the corrosion, scaling and blockage of the measured medium, which extends the service life and maintenance cycle.

- Measurement accuracy requirements are low, limited by tank thickness and medium properties. The signal of the external level meter needs to penetrate the tank wall and the air layer, so it will be affected by factors such as the thickness of the tank and the material, the temperature and density of the medium, resulting in signal attenuation and error.

Application scenario

The 80GHz radar level meter and the external level meter are suitable for different working conditions, as follows:

-80 ghz radar level sensor is suitable for non-contact continuous level measurement of liquid, slurry and sludge in chemical, pharmaceutical, energy, food and other industries under complex conditions such as high precision, high temperature, high pressure, high viscosity, strong steam and strong dust.

- The external type liquid level gauge is suitable for small tank thickness, stable medium properties, low measurement accuracy requirements, such as water treatment, aquaculture and other industries of liquid level measurement.