What is the minimum flow rate for a small flow meter | mass flow meter

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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. Float flowmeter has become a commonly used flow measurement instrument in industrial control due to its advantage

s of small pressure loss and large measurement range. It is not only convenient to use, but also has strong compatibility. Especially suitable for measuring medium flow rates with low flow rates and small flow rates. Float flowmeter has the characteristics of simple structure, intuitive, low pressure loss, and easy maintenance. Float flowmeter is suitable for measuring small flow rates through pipelines with a diameter of D<100mm, and can also measure the flow rate of corrosive media.

3、 Vortex flowmeter. The vortex gas flowmeter operates based on the principle of forced vibration vortex flow. The lower flow limit of the vortex gas flowmeter is much lower than that of the same caliber vortex street flowmeter, which is an advantage for measuring small flow gases. Spiral vortex gas flowmeter has a wide working temperature range; Large range; Within a certain Reynolds number range, it is not affected by fluid temperature, pressure, density, and viscosity; Strong adaptability, generally does not require a filter unless it contains larger particles or longer fiber impurities; The requirements for the upstream and downstream straight pipe sections are relatively low, and the upstream 4D and downstream 2D straight pipe sections are sufficient; Characteristics such as linear relationship between output frequency and volumetric flow rate.

4、 Thermal flowmeter. The main features of a thermal gas mass flowmeter are: direct measurement of mass flow without temperature and pressure compensation; Non contact, no moving parts, low pressure loss, high reliability; Can measure low flow rate and small gas flow rate; Require the gas medium to be dry and clean, free of impurities such as moisture and oil; The plug-in thermal g

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