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1. Manufacturer of Ultrasonic Doppler Open Channel Flow Meter
2. What is the low flow rate cut-off value of ultrasonic flow meter?
The low flow rate cut-off value of ultrasonic flow meter refers to a threshold set by the manufacturer to ensure the accuracy of the accumulated amount of the flow meter, which does not accumulate or display flow at low flow rates. Here is a detailed explanation of the concept
1. Purpose of setting: In practical use, when external interference occurs to the ultrasonic flowmeter, the flowmeter may have small flow displays, but these displays may not be accurate and are not generated by real fluid flow. In order to avoid the accumulation of inaccurate flow data and the occurrence of errors in the overall accumulation, manufacturers will set a low flow rate cutoff value. The specific function of the cutoff value is that when the measured flow rate of the flowmeter is lower than this cutoff value, the flowmeter will not accumulate flow or display this part of the flow data. This can ensure that the accumulated flow data is more accurate and reflects the real fluid flow situation. 3. Setting range of cut-off value: Generally speaking, the cut-off value for low flow rate will be less than 1% of the full range of the flowmeter. This setting range is based on a comprehensive consideration of various factors such as the measurement accuracy of the flowmeter, the degree of external interference, and actual application requirements. Note: When using an ultrasonic flowmeter, users should pay attention to understanding the low flow rate cutoff value of the flowmeter in order to correctly understand and use the flow data. If accurate flow measurement is required at low flow rates, it may be necessary to consider using other types of flow meters or taking other measures to improve measurement accuracy.
3. Application and troubleshooting of ultrasonic flow meters?
1. Measurement principle of ultrasonic flowmeter Ultrasonic flowmeter is a non-contact flowmeter. The working principle is that the propagation speed of ultrasound in a fluid is affected by the fluid velocity. By measuring the propagation speed of ultrasound in a fluid, the fluid velocity can be detected and the flow rate can be converted. Taking the widely used time difference method ultrasonic flowmeter as an example, when ultrasonic waves propagate in a fluid, the propagation speed of the ultrasonic waves in the downstream direction increases and the reverse direction decreases, that is, the same propagation distance has different propagation times. Then, the flow rate is calculated by using the relationship between the difference in propagation speed and the measured fluid flow velocity to convert the flow rate. When the ultrasonic beam propagates between the "upstream sensor" and the "downstream sensor" in the direction of water medium flow in the pipeline, the flow of water will cause a small change in the propagation time of the ultrasonic beam relative to static propagation, and this change in propagation time is proportional to the flow velocity of water. This is the measurement principle of the time difference ultrasonic flowmeter. The theoretical expression of its relationship is as follows: V=MD/sin2 θ × △ T/TupDown, where M - is the number of straight line propagation times of the ultrasonic beam in water θ - is the angle between the ultrasonic beam and the water flow direction Tup - is the propagation t