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Application of Mass Flow Meters in Urban Natural Gas Metering - Focus on Microfluidic Control Technology

The mass flow meter is similar to the traditional thermal mass flow meter in that the mass flow of the fluid corresponds to the amount of heat carried by the sensor. On the flow chip, a temperature sensor is set up symmetrically between the top and the bottom of a micro heat source, and an ambient temperature sensor is also provided to adjust the influence of the environmental temperature change on the micro heat source.

The mass flow rate of the fluid, the temperature change at the top and bottom of the micro heat source, and the power of the micro heat source are the main parameters of the chip.

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

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

The advantages of mass flowmeters are:
1 Larger range ratio, the MF-FD series gas mass flowmeter has a 100:1 turndown ratio.
2 Small initial traffic. It can effectively solve the problem of small flow meter leakage of mechanical flowmeters and reduce the supply and sales gap of gas companies.
3 Direct quality measurement, without temperature and pressure compensation, reducing measurement losses.
4 The pressure loss is small, which can ensure the energy-saving operation of the system.
5 light weight. Compared with positive displacement flowmeters, the weight of MEMS mass flowmeters is greatly reduced.
6 No moving parts.
7 full electronic intelligence function. Specially-designed electronic control components can provide functions such as signal transmission, accident alarm, and IC card control; built-in memory for historical data recording creates conditions for in-depth analysis and management of users' gas use; network communication functions can easily realize the system of urban gas meters. Management has created conditions for city gas to achieve peaking and step-by-step charges.

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