Selection of ultrasonic level gauge
Sulphuric acid, hydrochloric acid, nitric acid and other corrosive liquids are common in chemical companies. The first choice when measuring liquid level is non-contact level gauge. Ultrasonic level gauge is one of the most commonly used level gauges.
Ultrasonic liquid level gauge is non-contact measurement, suitable for most measuring media. Ultrasonic liquid level gauge is a new type of liquid level measuring instrument. It has very wide application in industrial process measurement. It has reliable work, easy installation, long service life, Maintenance-free features and a relative price advantage. Because the ultrasonic liquid level gauge does not contact with the measured medium when measuring the material level, it is also a fully sealed antiseptic structure. Therefore, it is effective for liquid level measurement of viscous, corrosive, and turbid liquids. Some analysis was made on the precautions for measuring the liquid level of corrosive media by ultrasonic level gauges. It is hoped that manufacturers will be able to help with the purchase of suitable level gauges.
The first thing to consider when choosing a ultrasonic level gauge is the medium temperature. The temperature level of the ultrasonic level gauge should be between -20°C and 80°C. The temperature around the high temperature probe should be between -20°C and 100°C.
The second is the selection of sensors. When measuring the corrosive medium by ultrasonic liquid level gauges, general manufacturers will choose anti-corrosion type probes. Considering environmental factors, physical sealed anti-corrosion probes should be selected for this occasion.
The final part is the selection of the host part. As the host part, good sealing is required. As long as there is a little media leakage, it may enter the inside of the ultrasonic level gauge from the housing or the inlet to cause the internal circuit board to be corroded. For the corrosive gases in the environment, separate ultrasonic level gauges can be used to protect the life of the host.
Ultrasonic level gauges cannot detect reflected echoes simultaneously when transmitting ultrasonic pulses. Since the transmitted ultrasonic pulse has a certain time width, and the sensor still has aftershocks after the ultrasonic wave is transmitted, the reflected echo can not be detected during the detection. Therefore, a small distance from the probe surface downward cannot be detected normally, and this distance is called a blind zone. If the highest level of the tested material is in the blind area, the meter will not be able to detect it correctly and errors will occur. If necessary, the level gauge can be installed higher. When selecting the type of engineering design, the most important issue to be noted is to choose a good installation location and design a suitable installation interface. The installation position should choose the position where the liquid level is smooth and the surface of the material is flat as far as possible. At the same time, it should be far away from the escalator, feed inlet, and discharge outlet, and keep as far as possible from the container wall, away from the stirrer.
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