Phenomenon and solution
Guided wave radar level gauge easy installation and commissioning, maintenance workload, adaptability, high performance, high precision, stable and reliable performance, easy operation and safety, high protection level, strong anti-interference ability, long service life, can be widely Applied to on-site measurement requirements for level and level production in metallurgy, building materials, energy, petrochemical, water conservancy, food, and other industries. It has unparalleled advantages compared with contact instruments such as capacitors and hammers. Microwave signal transmission is not affected by the atmosphere, so it has a strong advantage in measuring the production process with volatile gases, high temperature (350 °C), high pressure, steam, vacuum and high dust and other harsh environments. It is a cost-performance ratio. Very high gauge.
A good instrument must also be good at using and maintaining, especially as a precision digital instrument such as a guided wave radar level gauge. Good installation and use and maintenance can not only ensure the stable and accurate measurement of the instrument, but also greatly prolong the service life of the instrument. The following mainly introduces the four kinds of common faults and corresponding treatment methods during the use of the guided wave radar level gauge (level gauge).
Symptom 1 For handling of antenna crusts:
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 cleaning solution can also be cleaned with an acidic cleaning solution, but no material level measurement can be performed during cleaning.
Symptoms of the two probes 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 increased. The method of interlocking the measured value of the material level 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 material level reaches the maximum value, the feed pump can be stopped or the discharge pump can be started.
Symptom 3: The effect of foam on the measurement:
Dry foam and wet foam can reflect radar waves back and have no effect on measurement. Neutral foam absorbs and diffuses radar waves, which seriously affects echo reflections and even no echoes. When the surface of the medium is thick and thick, the measurement error is large or cannot be measured. Under this working condition, the radar level gauge has no advantage, which is the limitation of its application.
Symptom 4 flooded corresponding treatment method:
The solution to this problem is to change radar level gauges to waveguide-type measurements. 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 bad working conditions that the slurry overflows from the exhaust pipe, the material will not be used. 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 and is obtained. 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.
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