Method for correct installation and maintenance of guided wave radar level gauge

Many people do not install the guided wave radar level gauge during installation. Many of them have some more or less errors when installed. At this time, it is prone to measurement failures. The installation guide of the wave radar level gauge for liquid measurement.
 

First, the installation method

1. The distance between the installation position and the tank wall is recommended to be 1/6-1/4 of the tank diameter (at least 300mm, concrete tank is at least 400mm). Do not install in the middle of the metal tank. Do not install the probe at the feeding port. When selecting the probe length, pay attention to the product probe. The bottom is more than 30mm away from the bottom of the tank. Note the temperature of the medium.

2. Obstructions in the tank should pay attention to the distance between the probe and the obstacle at least 200mm

3. Disturbance elimination of interference echo suppression: The software can achieve suppression of interference echoes, so as to achieve ideal measurement effects. Bypass tubes and waveguides (for liquids only) Viscosity does not exceed 500cst, bypass tubes can be used. Way to avoid interference.

4, liquid standard installation

For media with viscosity less than or equal to 500 cSt, which is less likely to produce adhesion, the tube probe is a good solution. Its characteristics are as follows: Excellent reliability can be used for any medium with a dielectric constant of 1.4 or greater, and the conductivity of the measurement is independent of the conductivity of the medium. Obstructions and short pipe sizes do not affect the measurement of the lateral pressure that the rod-type probe can withstand High-viscosity media are recommended for rod probes

Second, troubleshooting

1, probe knots and frequent troubleshooting methods

The first method is to increase the installation position of the probe, but sometimes the installation conditions are limited and cannot be improved. The method of interlocking the level measurement value with the pump of the tank should be used to solve this problem: The bit set value is reduced by about 0.5m. When the liquid level reaches this maximum value, the discharge pump can be stopped or opened.

2, on the impact of foam on the measurement

When dry and wet foams reflect radar waves, they have no effect on measurement. Neutral foams absorb and diffuse radar waves, which seriously affects echo reflections and even no echoes. When the surface of the practical medium is a thick and thick foam, the measurement error is large or cannot be measured. Under this working condition, the radar level gauge has no advantage, which is a limitation of its application.

3, for the treatment of antenna scars

A material with a small dielectric constant has no effect on the measurement in the dry state, and a material with a high dielectric constant has an influence on the measurement. It can be purged with compressed air (or clean water), and the cooled compressed air can reduce the temperature of the flange and electrical components. The alkaline solution is cleaned with an acidic cleaning solution, but the level measurement cannot be performed during cleaning.

4, the corresponding treatment method flooded

The solution to this problem is to change the radar level gauge to a waveguide type measurement. The waveguide type radar level gauge is still installed at the original opening, and the waveguide is higher than the exhaust pipe by about 0.2m. In this way, even if the liquid slurry overflows from the exhaust pipe, it will not cause liquid to flow. The meter antenna is submerged by the slurry, and the stirrer eddy currents are prevented from interference and a large amount of steam emerges from the probe, which reduces the damage to the probe. At the same time, due to the good focusing effect of the waveguide, the received radar wave signal is stronger. A good measurement effect. The use of waveguide tube measurement method can improve the metering measurement conditions, improve the instrument measurement performance, has a high value of promotion and application.