The digital display gas flowmeter is very sensitive to the change of flow rate

The digital display gas flowmeter is very sensitive to the change of flow rate. To make the thermal flowmeter work normally, the digital display gas flowmeter must make the temperature of the probe reach a certain level, that is, provide a certain amount of energy to the thermal probe. From the formula , the energy provided is w=i2hrh. For a thermal probe with a certain geometric scale and structure, if its heat dissipation conditions and other factors are also similar, the energy to maintain a certain probe temperature level should also be similar. Therefore, if the probe resistance is increased, then The heating current can be reduced, but the magnitude of the reduction is not the same, and the voltage across the probe of the digital display gas flowmeter will increase. For a certain power supply voltage, the increase of the probe resistance will have a limit, and it cannot be used blindly. The method of increasing the resistance to reduce the current. The measurement of the digital display gas flowmeter is an important aspect of flow measurement. At present, there are many measurement methods of gas flow, such as differential pressure measurement method, speed measurement method, etc. These measurement methods are mature. , are widely used, but the flow metering devices using these methods generally require a certain length of straight pipe sections before and after the flowmeter, or a flow regulator is installed in the pipeline, which is difficult to meet the installation requirements in some occasions. The digital display gas flowmeter uses the tracer method to measure the gas flow, which is not affected by the shape of the pipeline and the flow velocity distribution of the gas in the pipeline. On the contrary, for complex pipelines such as ten-bend pipes and valves, it can just promote the mixing of gases and improve Accuracy of flow measurement. The digital display gas flowmeter is a kind of flow meter made according to the principle of medium heat transfer. It is generally used to measure the mass flow rate of gas. According to the different physical quantities to be measured, there can be the following three measurement relationships: 1) Using the fluid flowing through the heating pipe 2) Using the relationship between the energy required for the fluid temperature to rise to a certain value when heating the fluid and the relationship between the fluid mass flow; 3) Using the energy taken away when the fluid flows through the heating probe The relationship between heat and fluid mass flow. Thermal digital display gas flowmeter has low pressure loss, large flow range, high precision, high repeatability and high reliability, no moving parts and can be used for extremely low gas flow monitoring and control and other characteristics. According to the above three measurement relationships, it can be divided into two measurement methods, one is to add necessary heat to the fluid, the heat energy flows with the fluid, and the flow can be obtained by detecting the heat change at the corresponding point; the other is to flow The heating element is placed in the fluid, and its temperature changes with the flow rate. The digital display gas flowmeter can measure the flow rate by detecting the cooling degree of the heating element; the former is called the thermal type, and the instruments belonging to this measurement method include the early Thomas flowmeter, Non-contact boundary layer flowmeters and thermal distribution flowmeters; the latter is called thermal conductivity, and instruments belonging to this measurement method include anemometers, immersion flowmeters, etc.

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