What flowmeter is used to measure small liquid flow?

When the liquid flow is small, vortex flowmeters, electromagnetic flowmeters, ultrasonic flowmeters and mass flowmeters can be used.

1. Vortex flowmeter

The vortex flowmeter is a flowmeter with high precision and high linearity. It is suitable for testing small flow rates. The minimum flow range is usually is 0.5L/min. The advantages of vortex flowmeter are simple structure, small size, light weight, and high accuracy, which can meet the needs of many small flow tests.

However, the vortex flowmeter has higher requirements on the viscosity of the fluid, and errors may occur when testing low-viscosity liquids. Moreover, the fluid of the vortex flowmeter must not contain particles and dust, otherwise the performance of the flowmeter will be compromised. will be affected.

2. Electromagnetic flowmeter

The electromagnetic flowmeter is a flowmeter without moving parts, so it operates stably and reliably and is suitable for small flow tests. The minimum measurement range of electromagnetic flowmeter is usually 1L/min.

Electromagnetic flowmeters have the advantages of compact structure, high accuracy, and fast response speed. However, it should be noted that electromagnetic flowmeters have higher requirements for hollow pipes and electromagnetic environment. When using them, you need to pay attention to the surrounding environment. Influence.

3. Ultrasonic flowmeter

Ultrasonic flowmeter is a flowmeter suitable for small flow testing. It has high sensitivity and the minimum measurement range can reach 0.1L/min. The advantages of ultrasonic flow meters are high accuracy, wide measurement range, and good adaptability to fluid viscosity and temperature.

However, ultrasonic flow meters require a relatively large pipe diameter, generally exceeding 20mm, which is not suitable for testing micro-pipes and has higher requirements for liquid quality.

4. Mass flow meter

A mass flow meter is a flow meter that directly measures the mass flow of fluids. It has high accuracy and good stability, and is suitable for small flow tests. The minimum measurement range of a mass flow meter is usually 0.05L/min.

The advantages of mass flow meters are high measurement accuracy, fast response speed, and changes in fluid viscosity and density have little impact on measurement, etc., but the price is relatively high.

In summary, when testing small liquid flow rates, different flow meters should be selected according to specific conditions. Vortex flowmeters, electromagnetic flowmeters, ultrasonic flowmeters and mass flowmeters are all feasible choices, but each flowmeter also has its applicable range and limitations, and you need to choose according to actual needs. #massflowmeter#