1、 Overview

The thermal mass flowmeter adopts the principle of thermal diffusion, which is a technology with excellent performance and high reliability under harsh conditions. Its typical sensing elements include two thermal resistors (platinum RTDs), one is a speed sensor and the other is a temperature sensor that automatically compensates for gas temperature changes. When two RTDs are placed in a medium, the velocity sensor is heated to a constant temperature above ambient temperature, while the other temperature sensor is used to sense the temperature of the medium. The mass flow rate of gas passing through the velocity sensor is calculated based on the heat transfer of the sensing element. As the gas flow rate increases, the heat carried away by the medium also increases. Causing the temperature of the sensor to decrease accordingly. In order to maintain a constant temperature, it is necessary to increase the working current through the sensor, and the magnitude of this increase in current is proportional to the flow rate of the medium.

Thermal gas mass flowmeter is a true mass flowmeter that does not require temperature and pressure compensation for gas flow measurement. It is convenient and accurate to measure and can display gas mass flow rate, standard condition flow rate, cumulative flow rate, time, and flow rate; Wide range ratio, capable of measuring gases with flow rates ranging from 100Nm/s to 0.1Nm/s, and can be used for gas leak detection; Good seismic performance and long service life. The sensor has no moving parts or pressure sensing components, and is not affected by vibration on measurement accuracy; Easy installation and maintenance, allowing for non-stop installation and maintenance when site conditions permit; Digital design, overall digital circuit measurement, accurate measurement, and easy maintenance.

2、 Technical parameters

3、 Specification for Selection of Thermal Gas Mass Flow Meter

4、 Thermal gas mass flowmeter spectrum