Installation precautions and specific methods of thermal gas mass flowmeter

Thermal gas mass flowmeter principle: The probe has two probes, one is a heating probe, which contains a high-precision PT20 resistance; the other is a reference probe, which contains a high-precision PT1000 resistance. The heating probe measures the wind speed; the reference probe measures the temperature of the wind speed, as we know, the thermal mass flow meter is based on thermal diffusion technology. The probe inserted into the fluid, due to the influence of the flow velocity of the medium, the heat of the heated flow probe will be lost, then, the relationship between its heat loss and the mass flow rate of the fluid can be expressed by the following mathematical model P/△T=A +B(Q)m Among them: P represents the power consumption, △T represents the temperature difference between the two probes, Q represents the mass flow rate, m represents the index coefficient, A and B are constants related to the physical properties of the gas. It can be seen from the formula (1) that the ratio of the power of the heating probe to the temperature difference is the mass flow rate of the fluid. If we keep △T constant and measure the flow of fluid according to the relationship between power consumption and mass flow of fluid, this method is called“constant temperature difference”Its advantages are: it is very sensitive at small flow points, the minimum can reach 0.05m/S, and it has good linearity; the flow rate response is fast, the minimum can reach 250ms. The range ratio is wide, generally greater than 100:1, but this principle also has disadvantages. The sensitivity of the range above 9om/s is poor, which also depends on the manufacturing process level of the sensor. The installation of the thermal gas mass flowmeter The installation of the split type thermal gas mass flowmeter is very simple, according to“*last five”the rules. We choose the DN80 pipe, weld a M27X1.5 base on the DN80 pipe, and screw the same specification locking head with the probe into the thread of the pipe. Just fix the adapter at the corresponding position on the device. Precautions for installation of thermal gas mass flowmeter To ensure the accuracy requirements of the measurement system, in addition to requiring the accuracy of the connected instrument, correct installation also plays a certain role. In principle, the installation should follow that the sensor probe is perpendicular to the pipeline. If the site does not allow it, the inclination angle should not be greater than±20°. The current output (standard 4~20mA) of the thermal mass flowmeter is active. There are two outputs: one is the flow rate signal; the other is the medium temperature signal. If the field interference is large, it can be equipped with a signal isolator. On the one hand, it plays the role of isolating the interference signal on the site, ensuring the stability of the connected instrument or computer system; on the other hand, it also plays the role of converting the signal from active to passive, which is more convenient for the passive signal to be compared with C and the acquisition card. need. The advantage of the thermal gas mass flowmeter is that it can not only measure fluid flow and temperature, but also output control contacts. We know that thermal mass flowmeters are made based on the principle of thermal diffusion, so their applications in places with high humidity, water droplets, and water vapor are limited. The application of general thermal mass flowmeters in this aspect is not ideal, but thermal mass flowmeters have characteristics in this aspect, and the application effect is ideal. The specific method is: 1) Install a filter screen upstream and an exhaust motor downstream to form a closed-loop system. The pressure loss of this filter screen is small, but it can filter out water droplets. 2), the software has compensation algorithms for high humidity and water vapor conditions and compensation coefficients for gases with different components.

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