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1. What is the minimum flow rate of a mass flowmeter that cannot be less than?
There is no fixed and unified standard for the minimum flow rate of a mass flowmeter, and it needs to be determined based on the specific product type, brand, and model. 1. Example of minimum flow rate for non defective products: The Dutch Bronkhorst gas mass flowmeter ES-103i has a minimum flow rate (controller) of 2 milliliters per minute, which is suitable for gas measurement and control scenarios with medium precision requirements. The quality flow meter of domestic manufacturer Yidu is designed based on the principle of laminar pressure difference. Its standard product has a minimum measurement and control range of 0.5 sccm (0.5 ml/min under standard conditions). According to the conventional range ratio of 100:1, the actual measurable range can be as low as 5 microliters/minute to 500 microliters/minute. 2. The conventional application range of gas mass flow meters. This type of flow meter is mainly targeted at small and micro flow gas scenarios, with a flow coverage range from 0.000001 m ³/hour to 300 m ³/hour, corresponding to pipe diameter specifications ranging from 3mm to 65mm. In practical applications, there is a direct correspondence between the physical structure of the flow meter (such as the diameter of the punching hole) and the flow range. 3. The core principles of equipment selection should be clarified by users first. Based on the minimum flow demand in actual operating conditions, select product models with lower range limits than this value. If the measured flow rate is close to the lower limit of the equipment range for a long time, it will lead to a decrease in measurement accuracy. It is necessary to instal
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2. The relationship between the minimum flow rate and the range ratio of 1:400 for ultrasonic flow meters
The core conclusion of the relationship between the minimum flow rate and the range ratio of 1:400 for ultrasonic flow meters is that the range ratio of 1:400 means that the minimum measurable flow rate is 1/400 of the full-scale flow rate, which directly reflects the lower limit and sensitivity of the instruments measurement range.
. 1. Rangeability is defined as the ratio of maximum flow rate to minimum flow rate. 1: 400 indicates that the minimum measurable flow rate of the instrument is 1/400 of the maximum flow rate while ensuring accuracy. For example, when the full scale is 400m ³/h, the minimum measurable flow rate is 1m ³/h2. Factors affecting minimum flow rate • Sensor sensitivity: High frequency ultrasonic probes (usually above 1MHz) can detect lower flow rate signals. Signal processing algorithm: using FFT or cross-correlation algorithm to enhance small signal recognition ability. Pipeline conditions: The length of the straight pipe section should be ≥ 10D (D is the pipe diameter) to ensure a stable flow field. three Technical Implementation Key Parameters | Parameter Items | Typical Requirements | | -------------------------------------------------------------------------------------------------------- Selection precautions: The actual minimum flow rate should be greater than the nominal minimum flow rate of the instrument by 20% to avoid measurement distortion. When the gas content of the medium is greater than 5%, a Doppler ultrasonic flowmeter should be selected. The installa