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1. What are the commonly used models of low-pressure and high flow air flow meters? The commonly used low-pressure and high flow air flow meters mainly include thermal gas mass flow meters, Annubar/Velbar flow meters, LWQ series compressed air flow meters, and universal vortex flow meters.
1. Thermal gas mass flowmeter 1 Adaptation scenario: Suitable for low-pressure air metering with low flow rate, wide range, and large diameter, it can directly measure mass flow rate without additional temperature and pressure compensation, and has high sensitivity to low flow rate gases. Performance parameters: accuracy of ± 1.0% to ± 1.5% FS, diameter coverage of DN15 to DN2000, and plug-in models can be adapted to ultra large diameter pipelines for infiltration.
2. Anuba/Veliba flowmeter 1 Installation features: Plug in installation does not require pipe breakage, with minimal pressure loss, suitable for measuring large-diameter air ducts, such as factory ventilation and large fan supply scenarios. Advantages and limitations: The pointer type can be read directly on site, with a simple structure and resistance to temperature and visible car spine pressure, suitable for low budget routine monitoring. However, under conditions containing impurities, it is easy to cause blockage of throttling components and needs to be cleaned regularly.
III. LWQ Series Compressed Air Flow Meter 1. Standard Basis: Developed in accordance with GB/T32021-2015 standard, integrated with temperature, pressure, flow sensors and intelligent flow integrator
2. Performance Features: Excellent low-pressure and high-pressure metering performance, flow range ratio of 20:1, good repeatability, accuracy up to 1.0 level, low pressure lo
3. Model Example: LWQ-25, nominal diameter DN25, starting flow rate ≤ 0.8m ³/h, flow range 2.5-25m ³/h.
.4. Universal Vortex Flow Meter 1 Adaptation scenario: Suitable for low-pressure air metering scenarios with medium to high flow rates, stable flow rates, and relatively stable pipeline pressures. Performance features: no moving parts, low pressure loss, long service life, with temperature and pressure compensation, accuracy of ± 1.0% R, caliber range of DN15 to DN300. Model example: such as Duoqin DVS-DG15F11U, medium is air, DN15 caliber, body material is 304 stainless steel, working pressure is 1.6MPa, can display instantaneous and cumulative flow on site, supports 4-20mA output, 24V power supply, and ensures flow measurement range of 2.8-12m ³/h for sail accuracy.
2. What is the principle and function of gas flow meter
The core function of gas flow meter is to accurately measure the flow of gas in pipelines or equipment. Its working principle varies according to different technical types of wheel cracking, and it serves key fields such as industry, energy, environmental protection, and medical care together.
. 1. Working principle: Gas flow meters are designed based on different physical principles and are mainly divided into the following types: differential pressure flow meters are based on the Bernoulli principle. They measure the pressure difference before and after gas flow by installing throttling devices (such as orifice plates) inside the pipeline to calculate the flow rate. Thermal flow meters utilize the heat conduction effect. After the sensor is heated, the gas flow will take away its heat. The flow rate value is obtained by monitoring the cor