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Mass flow meter application in urban natural gas metering - focus on microfluidic control technology

The mass flow meter is similar to the measurement principle of a conventional thermal mass flow meter, and the mass flow rate of the fluid corresponds to the amount of heat carried by the sensor. On the flow chip, one temperature sensor is symmetrically arranged on the upstream and downstream of one micro heat source, and an ambient temperature sensor is also provided to adjust the influence of the ambient temperature change on the micro heat source.

The mass flow rate of the fluid, the temperature changes upstream and downstream of the micro heat source, and the power of the micro heat source are the main parameters of the chip.

The flow measured by the sensor is mass flow independent of temperature and pressure.

Nevertheless, the temperature compensation of the control circuit is the main source of the temperature effect of the flowmeter.

The advantages of the mass flow meter are:
1 The range ratio is large, and the range ratio of the MF-FD series gas mass flowmeter is 100:1.
2 The starting flow is small. It can effectively solve the problem of small flow leakage of mechanical flowmeter and reduce the supply and sales of gas companies.
3 Direct quality measurement, no need for temperature and pressure compensation, reducing measurement loss.
4 The pressure loss is small, which can ensure the energy-saving operation of the system.
5 light weight. The weight of the MEMS mass flow meter is greatly reduced compared to a volumetric flow meter.
6 no moving parts.
7 full electronic intelligence. Specially designed electronic control components can provide functions such as signal transmission, accident alarm, IC card control, etc. Built-in memory for historical data recording, creating conditions for in-depth analysis and management of user gas consumption; network communication function can easily realize city gas instrument system Management has created conditions for measures such as peaking and ladder charging for city gas.

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