Affecting the measurement of ultrasonic sensor level gauge

- Jun 10, 2019-


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


ultrasonic sensor for level detection


Affect the measurement of ultrasonic level gauge:


1. Fault phenomenon: When the water surface is close to the probe, it can be measured. The water surface is not measured far from the probe. When the water temperature is low, the ultrasonic level gauge is normal. If the water temperature is high, the ultrasonic level gauge can not measure it.


2. Reason: The liquid medium generally does not generate steam and mist below 30-40 °C. Above this temperature, steam or mist is easily generated. 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 be attenuated once again, causing the ultrasonic signal to the probe to be weak, so it can not be measured, and in this environment, the ultrasonic level gauge probe is easy to form water droplets, and the water droplets will hinder the transmission and reception of ultrasonic waves;


3. Solution: To increase the range, the actual tank height is 3 meters. To select the ultrasonic level gauge of 6 meters to 9 meters, the effect of steam or mist on the measurement can be reduced or weakened. The probe should be made of PTFE. Or PVDF is made, it is made into a physical seal type. Such a probe surface does not easily condense water droplets. The emission surface of other materials is more likely to condense.


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