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Why can a throttling flowmeter only measure large and medium flow rates and not small flow rates?
A throttling flow meter is a common type of flow meter that reduces the fluid flow rate by installing a throttling element in the fluid pipeline, thereby measuring the flow rate.. Due to the use of throttling methods, only large and medium flow rates within a certain range can be measured, and small flow rates cannot be measured, for the following reasons:
1. Large fluid pressure loss: Due to the installation of throttling components in the fluid pipeline, the fluid will experience certain resistance when passing through, resulting in a decrease in fluid pressure and a decrease in pressure at the outflow end, which can lead to errors
2. Fluid cannot flow steadily through the throttling section: near the throttling tube, due to increased resistance, the fluid is prone to turbulence and the formation of eddies and vortices.
. This can cause fluctuations in flow rate, which can affect measurement accuracy. Limited measurement range: Throttle flow meters are suitable for measuring medium and large flow rates, and cannot effectively measure small flow rates because at small flow rates, measurement accuracy will be significantly reduced, which may result in significant errors. Based on the above reasons, for small flow measurement, other types of flow meters are generally adopted, such as electromagnetic flow meters, vortex flow meters, ultrasonic flow meters, etc. These flow meters typically have higher measurement accuracy and a wider measurement range, which can meet the measurement needs of small flow rates.2. What is the minimum flow rate of a mass flowmeter that cannot be less than?
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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 install a diversion device or replace the dedicated micro flow rate machine to achiev
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