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The thermal mass flow meter is an instrument for measuring gas flow by using the principle of thermal diffusion. It measure gas mass directly and also it needn't temperature and pressure compensation.
The thermal mass flow meter sensor part is composed of two reference platinum resistance temperature sensors (RTDS), one is the speed sensor RH, and the other is the temperature sensor RMG, which measures the temperature change of the gas. When the two RTDS are placed in the measured gas, one sensor RH is heated and the other sensor RMG is used to sense the measured gas temperature. As the gas flow rate increases, the airflow carries away more heat, and the temperature of the sensor RH drops. The temperature difference between the two RTDS is linearly related to the flow rate, and then this relationship is converted into a linear output through micro-electronic control technology, thus to realise the measurement of gas flow.
| Performance | Technical parameter | |
| Structural form | Insertion type | In- line type |
| Measuring medium | All gases (except Acetylene) | |
| Pipe diameter range | Caliber DN32 or higher | DN10~DN2000mm |
| Velocity range | 0.1~120Nm/s | |
| Precision | ±1~2.5% | |
| Operating temperature | Sensor:-40ºC~+220ºC convertor:-20ºC~+45ºC | |
| Working pressure | Medium pressure≤2.5Mpa | Medium pressure≤4.0Mpa |
| Power supply | DC24V or AC220V≤18W | |
| Response speed | 1s | |
| Output signal | 4-20mA (Photoelectric isolation, large load 500Ω),pulse,RS-485 (photoelectric isolation),HART agreement | |
| Alarm | 1-2 relay normally open contact,10A/220V/AC,*/30V/DC | |
| Type of supply | Separate structure, integrated structure | |
| Pipe material | Carbon steel, stainless steel, plastic, etc | |
| Field display | Four lines of Chinese liquid crystal display | |
| Display content | Mass flow, standard volume flow, cumulative flow, standard time, cumulative running time, standard flow rate, etc | |
| Protection grade | IP65 | |
| Sensor material | Stainless steel | Stainless steel, carbon steel |
Installation Tips
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