Ultrasonic level meter is widely used for level measurement in chemical industry, water treatment, water conservancy, food, grain and other industries. The product has the characteristics of safety, cleanliness, high precision, long life, stability and reliability, easy installation and maintenance, simple reading and so on. Ultrasonic level meter is a digital level meter controlled by microprocessor. In the measurement, the pulse ultrasonic wave is emitted by the sensor (transducer), and the sound wave is received by the same sensor after being reflected by the surface of the object and converted into an electrical signal. The distance between the sensor and the measured object is calculated by the time between the transmission and reception of the sound wave. Due to the non-contact measurement, the measured medium is almost unrestricted, and can be widely used in the height measurement of various liquid and solid materials.
Most sewage plants will use inverter, motor, centrifuge and other equipment with interference sources. These interference factors force the measurement of the ultrasonic level meter around it to be non-standard. When the measurement is not correct, it is the on-site staff who are worried. In order to allow the on-site staff to more accurately grasp the real-time level of the water level, the following solutions are summarized for everyone, so that you can easily solve the problem of ultrasonic level electromagnetic interference.
Phenomenon
Ultrasonic level meter data beat irregular, or simply show no signal;
Solution:
1. The ultrasonic level meter must be reliably grounded. After grounding, some interference on the circuit board will run away through the ground wire. This grounding is to be grounded separately and cannot be shared with other equipment.
2. The power supply can not be the same power supply as the inverter and the motor, nor can it be directly generated from the power system.
3. The installation location should be far away from the frequency converter, variable frequency motor, and 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 level meter to isolate the shield, and the instrument box also needs to be grounded.
