The market position of digital gas flowmeter is unshakable. Digital gas flowmeter is closely related to our life. Common gas, such as gas, or chemical industry, etc., many gases are very delicate, and a little carelessness may cause harm to the human body. This has established the role of digital gas flowmeters, which shows that the market position cannot be shaken! The principle of digital gas flowmeter is based on the principle of heat balance. At present, there are mainly two forms of hot film and hot film. The sensitive element is generally a platinum wire or wire with a very thin diameter (about 0.002~0.05 mm), and the hot film The sensitive element is a thin film resistor formed by depositing metal (such as platinum) on a ceramic substrate. The working principle of the type and the hot film type is the same. Figure 1 shows the working principle of the thermal gas flow sensor. Placed in the air flow channel (platinum wire or Wire) rh and compensation resistance rc form a balanced bridge in a stable flow field. When the air flow passes through the flow sensor, it is cooled, the temperature drops, and its resistance value decreases accordingly. The bridge of the digital gas flow meter loses balance. Through The feedback circuit composed of an integrated operational amplifier will automatically increase the supplied current ih to restore the original temperature and resistance value, thereby restoring the balance of the bridge. In fact, when the gas flow rate changes, the resistance does not change, but works at Constant temperature mode. When it has a tendency to change, the feedback of the operational amplifier changes the supplied current ih to keep the probe temperature (resistance) constant. The selection of the separation system should consider the treatment of liquid water. Cyclone separators were often used in station process design in the past, and gravity separators can also be used in occasions with low requirements. In recent years, filter separators have also been used. The main function of installing separators in gas pipelines and terminal stations is to remove various solid particles in natural gas. The digital gas flowmeters that are now being popularized (take the filter blade combination type as an example) can remove solid particles of various sizes. It can also separate more than 8~1Oμm of water vapor. The installation requirements of the digital gas flowmeter have been stated in the product manual. The digital gas flowmeter measures the gas flow rate, and the concentricity between the flowmeter body and the upstream and downstream straight pipe sections is very high. Therefore, the construction unit is required to be certain during installation. Strictly implement the installation regulations to achieve the required concentricity. The installation position of the digital gas flowmeter in the station is different from that of the orifice flowmeter.
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