What is the working principle of a portable gas flow meter and a thermal gas mass flow meter??

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1. What are the models of flow meters for low-pressure and high flow air measurement? Flow meters that can be used for low-pressure and high flow air measurement mainly include LWQ series, V10FD-L type, Songye Bian LUGB type, P100-PLG type, etc. The LWQ series compressed air flow meter includes multiple products that are suitable for low-pressure air measurement. Among them, the universal model of Guangzhou Dongyi Automation Technology Co., Ltd. integrates temperature, pressure, flow sensors and intelligent flow integrator, which has the characteristics of wide flow range ratio (Qmin/Qmax=20:1), 1.0 level measurement accuracy, low pressure loss, and low initial flow rate. It has low sensitivity to fluid disturbance, supports multiple signal outputs, and is suitable for use. Gas and air metering scenarios in urban pipelines and industrial fields; The LWQ-B-40 DN40 caliber produced by Shanxi Kaifeite Instrument Co., Ltd. is a speed flow instrument that can integrate temperature and pressure sensors to achieve automatic compensation and compression factor correction. It has excellent low-pressure and high-pressure metering performance and is suitable for gas measurement in multiple industries such as petroleum and chemical.

2. The V10FD-L low-pressure field defect type MFC/MFM product from Beijing Sersus Instrument Technology Co., Ltd. is suitable for non corrosive gases below 1MPa. The measurement range covers 5SCCM-250SLM and is divided into three levels: small range (5SCCM-10SLM), medium range (10SLM~30SLM), and large range (30SLM~250SLM). It adopts the principle of differential pressure mass flow measurement without thermal drift and response lag, with a response speed of 100ms and no need for preheating. It

supports digital analog compatibility and can communicate with a computer through analog secondary meters, PLC or digital interfaces to complete parameter setting and flow display.

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III. LUGB type compressed air flowmeter is a product of Jiangsu Xianda Instrument Co., Ltd., which supports multiple calibers such as DN12

5, DN150, DN200, etc. Different calibers correspond to different flow ranges, and functional codes such as temperature and pressure compensation, output signals, and connection methods can be selected as needed to adapt to low-pressure and high flow air measurement scenarios of different specifications.

. 4. The P100-PLG extremely low pressure loss portable gas mass flowmeter is a product of the Yidu brand, with a full range pressure loss of only 400Pa. It can accurately and stably measure flow under conditions close to atmospheric pressure or with low available system pressure. The accuracy can reach 1.0% reading in the range of 20% -100%. The built-in pressure and temperature sensors can achieve precise compensation, and the battery life is 8 hours. It is suitable for flow calibration of particulate matter atmospheric samplers, online flow calibration of low-pressure loss production lines, and other scenarios.

2. Recommended Alicat gas mass flowmeter series from the United States~

Recommended Alicat gas mass flowmeter series from the United States: The Alicat gas mass flowmeter series is widely used in various industrial and scientific fields due to its high precision, wide measurement range, and multiple functional characteristics.

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