Ultrasonic Level Gauge Two Common Faults and Treatment Methods
Ultrasonic liquid level meter A non-contact liquid level meter for measuring tanks has the advantages of flexible use, stable performance and high reliability. It is applicable to food, beverage, pharmaceutical and other fields. Today Xiao Bian mainly introduces two common faults and treatment methods of ultrasonic liquid level gauges, hoping to help everyone.
The first one is that there is stirring in the field container, and the fluid fluctuation is relatively large, which affects the measurement of the ultrasonic level gauge.
Symptoms: No signal or data fluctuations.
Reason: The ultrasonic level gauge says a distance of several meters, which means calm water. For example, an ultrasonic level gauge with a range of 5 meters generally means that the maximum distance for measuring calm water is 5 meters, and the actual factory will be 6 meters. When there is stirring in the container, the water surface is not calm and the reflected signal will be reduced to less than half of the normal signal.
Solution:
1. Choose a more large-scale ultrasonic level gauge. If the actual range is 5 meters, use an ultrasonic level gauge of 10 meters or 15 meters to measure.
2. If you do not change the ultrasonic level gauge and the liquid in the tank is not sticky, you can also install the waveguide. Put the ultrasonic level gauge probe in the waveguide to measure the height of the level gauge, because the liquid level in the waveguide is basically stable.
3. It is recommended to change the two-wire ultrasonic level gauge to four-wire.
The second type: There is electromagnetic interference on site.
Symptoms: Ultrasonic liquid level meter data irregularly beats, or simply shows no signal.
Cause: Many electric motors, inverters, and electric welding on the industrial site will affect the ultrasonic level gauge measurement. Electromagnetic interference can exceed the echo signal received by the probe.
Solution:
1. The ultrasonic level gauge must be reliably grounded. After the grounding, some interference on the circuit board will run off through the ground. And this grounding is to be grounded alone and cannot share a ground with other equipment.
2. The power supply can not be the same power supply as the inverter or motor, nor can it be directly powered from the power system power supply.
3. The installation site should be far away from the inverter, variable frequency motor, high-power electric equipment. If it can not be far away, it is necessary to install a metal instrument box on the outside of the gauge to isolate the shield. This instrument box should also be grounded.
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