Ultrasonic flow meter

• Medium: one homogeneous and stable liquid capable of conducting ultrasonic waves, such as water and wastewater.
• Accuracy: ±0.5%.
• Repeatability: Better than 0.2%.
• Power supply: lithium battery or 24V DC power supply, 220V AC power supply.
• Contents of the displayed information: instantaneous flow, accumulated flow.
• Output: 4-20mA output and RS-485 COMMUNICATION.
• Installation method: pipe type, outdoor type, plug-in type.
• Advantages: Easy replacement of wear parts, continuous production and maintenance. Easy installation, long service life, convenient and flexible, can be equipped with a temperature sensor, upgraded to an ultrasonic heat meter, can be equipped with a wall host to enable separation.

Operating principle of ultrasonic flow meter:

1. According to the principle of signal detection, ultrasonic flow meters can be divided into propagation velocity difference method (direct time difference method, time difference method, phase difference method and frequency difference method), beam displacement method, Doppler method, cross correlation method and spatial filtering , noise method, etc.

Classified according to the principle of measurement.

2. There are many types of USF for closed pipelines according to the measurement principle, and the two most used are the propagation time method and the Doppler method. Among them, the time difference of ultrasonic flow meter uses the principle that the time difference between the forward and backward propagation of sound waves in a liquid is proportional to the speed of the liquid to measure the flow of liquid. It is widely used to measure raw water in pipes, rivers and reservoirs, and to detect petrochemical product flows., measurement of water consumption, liquids in the production process and other areas.

According to the actual application needs, jet time ultrasonic flow meters are divided into portable ultrasonic flow meters, portable ultrasonic flow meters, stationary ultrasonic flow meters and pipeline ultrasonic flow meters.

Areas of application of ultrasonic flow meters:

• High-precision measurement of flow rate and total volume of product (water, cold, heat).
• Food industry.
• Chemical and pharmaceutical industries.
• Water purification and water treatment.
• Mechanical engineering.
• Construction industry.
• Heating systems, ventilation, air conditioning.
• Automated flow control systems, including alerting the operator about emergency and critical situations.

Ultrasonic transit time flow meter is most suitable for measuring the flow of liquids. Therefore, it is the most popular type of ultrasonic flow meter.

A Doppler ultrasonic flow meter can measure the difference in frequencies of sound waves reflected from bubbles or particles in an air stream. Suitable for carbonated or dirty liquids.

Flow meter installation:

The installation location of flow metering sections (VD) should be as far as possible from sources of vibration, shaking, electromagnetic interference (electric motors, pumps, compressors, etc.). On the pipeline where the high pressure tap passes, it must be ensured that there is no electrical voltage relative to the protective ground loop. The distance between the ID and the installation location of the calculator should be minimal. When installing the HP outdoors in an open area, it is recommended to provide protection from direct precipitation on the ultrasonic flow sensors (canopy, inclined canopy). The ID is installed into the pipeline gap. The section of the pipeline that is selected for inserting the ID must be placed in a horizontal plane, but can also be installed in a vertical position, at the same time, the coolant supply must be under pressure in the direction from bottom to top to ensure that the ID is filled with liquid. In all cases, the ID must be placed in the pipeline area, which ensures that it is completely filled with liquid, since if there is no liquid, the meters stop working and a malfunction is diagnosed.