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1. What is the low flow rate cut-off value of an ultrasonic flowmeter?
The low flow rate cut-off value of an ultrasonic flowmeter refers to a threshold set by the manufacturer to ensure the accuracy of the accumulated amount of the flowmeter, 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.
2. What are the top ten flowmeter manufacturers?
According to the industry information updated on February 9, 2026, the list of the top ten flowmeter manufacturers is as follows:
1. Emerson belongs to Emerson Electric (China) Investment Co., Ltd., which is at the forefront of technology in the fields of oil and gas trade handover and multiphase flow measurement. Its products meet the highest international standards and are suitable for high demand scenarios such as oil and gas extraction, transportation, and trade settlement.
2. MicroSensor, a subsidiary of MicroSensor Co., Ltd., provides measurement verification and calibration services for various types of flowmeters including pressure, electromagnetic, ultrasonic, quality, and differential pressure.
3. YOKOGAWA Belonging to Yokogawa Electric (China) Co., Ltd., the product design is excellent and the stability is outstanding. It has a deep foundation in industries such as chemical and water treatment, and is suitable for process industries that have strict requirements for accuracy and long-term stability. Bronkhorst belongs to Bronkhorst (Shanghai) Measurement Equipment Trading Co., Ltd. and is a wholly-owned subsidiary of Bronkhorst High Tech B.V in China. It is responsible for product sales, after-sales service, and technical support in the Chinese region. 5. Fischer Porter belongs to Beijing Fischer Porter Technology Development Co., Ltd., focusing on the research and production of fluid monitoring instruments, especially in special working condition flow rates. Experienced in metrology, our main products include high-pressure electromagnetic flow meters, vortex flow meters, et