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Brief introduction of pipe section thermal gas mass flow meter:

        The pipe-section thermal gas mass flow meter is a new type of thermal gas mass flow meter that uses the principle of heat conduction to measure flow. The instrument adopts the constant temperature difference method to accurately measure the gas mass flow, and has the advantages of small size, high digitization, easy installation, accurate measurement and so on.
Advantages of pipe-section thermal gas mass flow meters:
1. Now it can not only measure the flow of oxygen and other gases, but also hydrogen, acetylene and gases with large water content are not suitable for measurement;
2. Wide range ratio, can measure flow velocity as high as 120Nm/s and as low as 0.5Nm/s. Other instruments (such as turbine or vortex should be above 5m/s) can be used for gas leak detection. Low flow rate and negligible pressure loss;
3. It has the advantages of long-term stability, good repeatability, convenient installation and maintenance, small pressure loss (only one rod inserted), etc., and does not require pressure and temperature correction. It can directly measure the mass flow of gas. A sensor can be used at the same time. Perform low-range and high-range flow measurement;
4. Pipe-section thermal gas mass flow meters are especially suitable for large-diameter pipelines, low-velocity gas measurement, and installation, disassembly and maintenance under the condition of on-line uninterrupted process flow;
5. LCD dot matrix Chinese characters display, intuitive and convenient, and the operation is clear
6. Direct mass flow measurement without temperature and pressure compensation; low flow velocity measurement is very sensitive, and the medium temperature can reach +500 degrees;
7. Adopt automatic heat balance technology and self-compensation of medium temperature;
8. Proprietary algorithm, which can achieve high linearity and high precision; realize large pipe diameter and small flow measurement, very small flow can be measured as low as 0;
9. Using RS-485 communication or HART protocol, it can realize factory automation and integration.
Main technical parameters of pipe section thermal gas mass flow meter:
l Accuracy: 1% reading ±0.5% F.S
l Repeatability: ±0.2%
l Range: flow rate 0.05-90m/s (above 1/1000)
l Applicable pressure: <4.2MPa
l Applicable medium temperature range: -25-120℃, -25-200℃, -25-500℃
l Applicable medium: oxygen and other gases (except hydrogen, acetylene and gases with large water content)
l Measuring rod diameter: φ19 (standard)
l Sensor protection tube material: stainless steel 304, 316L
l Corrosion resistance measuring rod and sensor surface treatment: spraying PTFE
l Transmitter housing: die-cast aluminum
l Power supply: 24VDC, 220VAC dual power supply, full Chinese display
l Output: 4-20mA 485, (Hart and 4-20MA are available at the same time)
l On-site display: all Chinese display, nothing without display
l Gas conversion factor setting range: 0-9.999
l Supply type: split structure-transmitter + flow totalizer (for thermal type)
l Integrated structure-the meter itself has a flow totalizer
l Supply structure: plug-in flange short connection and plug-in flange base (suitable for high temperature above 250 degrees) and pipeline type (10-80 caliber is conventional) 80 or more plug-in type is recommended
l Protection standard: IP65 IP67
l Cable outlet hole: G1/2 (separate) and M20×1.5 (integrated)
l Service life: about 5 years
l Explosion-proof grade: ExdⅡCT4
Connection mode and specifications of pipe section thermal gas mass flow meter:
1. Thread connection, flange mounting, flange connection: DN10～DN50.
2. Flange mounting and flange connection: DN10～DN2000.
3. Plug-in type: DN80～DN2000.
Recommendations for the selection of pipe-section thermal gas mass flow meters:
According to the structural characteristics of the pipe-section thermal gas mass flowmeter of the intelligent flowmeter series, it is classified into two types: plug-in type and pipe type.
    The plug-in sensor 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 ball valve on the base, and then use a special tool to drill a 22mm diameter hole in the pipeline. After the drilling is completed, remove the special tool, and then install the sensor. Install on the valve and insert the sensor into the center of the pipe (the insertion position of the sensor has been determined at the factory). The plug-in sensor is suitable for pipe diameter: DN80～6000mm.
Pipe-section pipe-section thermal gas mass flow meters are equipped with process pipelines with the same inner diameter as the on-site pipelines when they leave the factory. The connection with the on-site pipeline is flange connection or threaded connection. Pipe section sensor is suitable for pipe diameter: DN10～2000mm.
Application occasions:
All production and use of hot gas on site.
Measuring range:
    In order to facilitate the selection, we simply define the standard volume flow rate of thermal gas as the volume flow rate under standard conditions (1 standard atmospheric pressure and 20 degrees).