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The thermal mass flowmeter is an instrument for measuring gas flow by using the principle of thermal diffusion. The sensor consists of two reference thermal resistors (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 Insertion thermal gas mass flowmeter can be installed and maintained online. The installation process is to first weld a base with external threads on the outer wall of the pipeline, install a 1-inch stainless steel ball valve on the base, and then use a special tool to drill a hole with a diameter of 22mm, remove the special tool after the hole is drilled, and then install the sensor on the valve and insert the sensor into the center of the pipe (the insertion position of the sensor has been determined before the factory). Insertion thermal gas mass flowmeter suitable for pipe diameter: DN32 ~ 6000mm.
Performance | Technical parameter | |
Structural form | plug-in | pipe |
Measuring medium | All gases (except acetylene) | |
Diameter range | Caliber DN32 or higher | DN10~DN200mm |
Velocity range | 0.1~120Nm/s | |
Precision | ±1~2.5% | |
Operating temperature | Sensor:-40ºC~+120ºC 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 | |
Local 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 degree | IP65 | |
Sensor material | Stainless steel | Stainless steel, carbon steel |
Installation Tips