How to choose the right thermal gas mass flow meter?
The origin of the thermal gas mass flowmeter is from the hot wire anemometer. The temperature of the platinum heating wire has a proportional relationship with the change in the flow rate of the fluid: the faster the flow rate, the more heat is taken away.
The origin of the thermal gas mass flowmeter is from the hot wire anemometer. The temperature of the platinum heating wire has a proportional relationship with the change in the flow rate of the fluid: the faster the flow rate, the more heat is taken away. The key to the correct selection of thermal gas mass flow meters is to learn more, master the measurement principle and product performance, and do more in-depth exchanges with product manufacturers’ business personnel to identify the characteristics of each brand. In order to base on oneself, correctly choose the thermal gas mass flowmeter products that meet their requirements.
There are data to prove that in the flow measurement of the probability of failure, the improper selection of flowmeter accounted for about 70%, flowmeter product quality or other reasons accounted for 30%, so the selection of flow measurement is how important.
For example, the flow range (it is recommended that the flow unit use the standard square), the measuring medium, the caliber of the pipeline, the material of the pipeline, the working pressure, the working temperature, whether it is required to explosion-proof, the working environment temperature of the flow meter, the signal power requirements, the accuracy level, the application in what process (is the process control or trade measurement), the measurement of the dryness and cleanliness of the medium. To measure the flow rate of mixed gas, it is necessary to provide the percentage value of each medium.
Of course, unless you have low requirements for the measured data, don’t care how much deviation, just look at the flow trend, or you can choose those low-end thermal flowmeter products. Pay more attention to the products that are dumped at low prices.
If the site conditions are suitable, the thermal gas mass flowmeter selection integration. If it is separate, because the transmission signal cable is as a part of the measurement bridge, it has a resistance value, no matter how good it is, because the resistance value of the measurement probe is very small, the resistance value of the cable is bound to affect the calculation and processing of the electronic circuit, coupled with the impact of the field environment, the resistance value will drift. If you must choose a split, it is recommended that the split distance selection be as short as possible.