FAQ: Improvement measures for water droplets on the probe surface of ultrasonic level gauge

- Aug 18, 2020-

 

Ultrasonic level gauges are widely used for level measurement in the chemical, water treatment, water conservancy, food, and grain industries. The product has the characteristics of safety, cleanliness, high precision, long life, stable and reliable, convenient installation and maintenance, and simple reading. The ultrasonic level meter is a digital level meter controlled by a microprocessor. In the measurement, pulsed ultrasonic waves are emitted by the sensor (transducer), and the sound waves are reflected by the surface of the object and then received by the same sensor and converted into electrical signals. The distance between the sensor and the object to be measured is calculated from the time between the emission and reception of the sound wave. Due to the non-contact measurement, the measured medium is almost unlimited, and it can be widely used for height measurement of various liquids and solid materials.

Common faults and countermeasures that affect the measurement of ultrasonic level gauges:

1. Trouble phenomenon: It can be measured when the water surface is close to the probe, and it cannot be measured when the water surface is far away from the probe. When the water temperature is low, the ultrasonic level gauge can measure normally, and the ultrasonic level gauge cannot measure when the water temperature is high;


2. Reason: The liquid medium generally does not produce steam or mist when the temperature is below 30-40℃. When the temperature exceeds this temperature, it is easy to produce steam or mist. The ultrasonic wave emitted by the ultrasonic level gauge will attenuate once through the steam during the launching process. When it is reflected back, it will attenuate again, causing the ultrasonic signal to the probe to be very weak, so it cannot be measured. Moreover, in this environment, the ultrasonic level gauge probe is prone to water droplets, which will hinder the transmission and reception of ultrasonic waves;


3. Solution: To increase the range, the actual tank height is 3 meters, and an ultrasonic level gauge of 6-9 meters should be selected, which can reduce or weaken the influence of steam or mist on the measurement. The probe should use PTFE Or PVDF, the OSENON ultrasonic sensor has made a successful countermeasure to this, and made it into a physically sealed type. Such a probe is not easy to condense on the emitting surface, and other materials on the emitting surface are easier to condense.

 

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