Flow meter for measuring gas flow rate

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How to measure gas flow rate?

There are many methods for measuring gas flow rate, and the following are some common methods in their degeneracy.

1. Differential pressure flowmeter: Based on the Bernoulli principle, the gas flow rate is calculated by measuring the pressure difference between two points inside the pipeline.

. This method can measure various types of gases and is more suitable for measuring small and medium flow rates.

2. Thermal flowmeter: a method of measuring the heat transfer inside a pipeline by measuring the gas passing through it.

. This method is suitable for measuring low flow gases and can measure the volume flow rate and mass flow rate of gases. Ultrasonic flowmeter: uses the relationship between the speed of ultrasonic waves propagating in gas media and the gas flow rate to measure gas flow rate. This method has the advantages of non-contact, no pressure loss, wide measurement range, and high accuracy, and is suitable for measuring various gas flow rates.

4. Rotary flowmeter: It consists of a glass tube and a rotor. When gas flows out from bottom to top, the height of the rotor floating up with the gas flow is related to the gas flow rate. The scale of the rotor flowmeter is only a mark, so when using reagents, it is necessary to use a soap film flowmeter under pressure to determine accurate calibration, that is, to draw calibration curves of the volume flow rate of different gases and the height of the rotor. 5. Soap film flowmeter: composed of a measuring tube with a gas inlet and a rubber head. Inject clear soapy water into the rubber dropper during use, and squeeze the dropper to create a soap film that enters the measuring tube to block the mark. When the

airflow enters, it will push the soap film upwards. As long as a stopwatch is used to measure the time required for a certain volume of soap film to flow, the volumetric flow rate of gas can be calculated with a measurement accuracy of 1%, which is currently the standard method for measuring gas flow rate. 6. Calibration valve: Using the principle that the number of rotations of the stabilizer valve and needle valve mold is approximately proportional to the gas flow rate, the gas flow rate value can be measured by drawing pressure and flow correction curves for different gases. 7. Pressure gauge: Add a fixed gas resistance after the stabilizer valve, and add a pressure gauge between the stabilizer valve and the gas resistance. At this time, the larger the output gas flow rate of the stabilizer valve, as long as the gas resistance remains unchanged, the displayed value of the pressure gauge will also be larger. These methods each have their own advantages and disadvantages, and appropriate methods should be selected for measurement based on specific gas types, flow rates, measurement accuracy, and environmental conditions.

2. How to choose a suitable gas mass flowmeter

Choosing a suitable gas mass flowmeter requires consideration of actual needs and comprehensive factors. The following is a specific selection guide

1. Clarify the measurement range. The measurement range of a gas mass flowmeter is usually 0.1 to 1000 Nm3/h, and the model that matches the coverage range should be selected according to the actual flow requirements.

. If the flow rate fluctuates greatly, it is necessary to ensure that the upper and lower limits of the flowmeter can cover the maximum and minimum flow rates to avoid ove

Flow meter for measuring gas flow rate

How to measure gas flow rate?

2. How to choose a suitable gas mass flowmeter

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