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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. What are the commonly used small flow gas flow meters? There are two types of small flow measurement: one is to measure the gas or liquid flowing through a small pipeline with high accuracy; Another method is to measure the flow rate of fluids with very slow flow rates. There are many commonly used gas flow meters suitable for measuring small flow rates, such as differential pressure, float type, vortex type, thermal type, etc. Some gas flow meters are suitable for measuring medium and large flow rates, as well as small flow rates, while others are specifically designed for measuring small flow rates.
1、 Differential pressure flowmeter. The differential pressure flowmeter suitable for measuring small flow rates is mainly the internal orifice plate differential pressure flow chamber pin flowmeter. There are several significant differences between this flow meter and a flow meter with a standard throttling device as the sensor. The first difference is in structure, where the built-in orifice plate integrates the sensor bucket wheel with the transmitter. The second difference is the pipe diameter, which is suitable for concealed orifice plates with a diameter of less than 50mm. The typical inner diameters of pipelines are 10mm and 20mm. The third difference is the accuracy, which can be ensured by the method of real flow calibration for concealed orifice plates. After real flow calibration, the accuracy can reach level 1.5.
2、 Float flowmeter. Float flow meters, also known as rotor flow meters, are mainly classified by material into glass tube float flow meters and metal tube float flow meters. Flo