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1. Types of thermal mass flow meters
Thermal mass flow meters mainly have three core types: thermal distributed, immersion, and heat dissipation, which are suitable for scenarios such as small flow rates, large diameter pipelines, and fast response. 1. The thermal distributed mass flowmeter measures flow rate by utilizing the changes in heat transfer when the fluid passes through a temperature field. The core components include a heating sensor and a temperature measurement sensor. Its characteristics include: • Lightweight structure, particularly suitable for detecting small flow rates (such as upgrading gas at tens of millimeters per minute) - often used in high-precision fields such as gas purity analysis and semiconductor etching processes. 2 Immersion thermal mass flowmeter operates by directly contacting the fluid with a probe inserted into the pipeline, and has a dual element structure (heater and temperature measurement unit). Typical features include: • Suitable for large pipe diameters and can be installed in pipelines with a diameter of DN200 or more - widely used in industrial scenarios such as petroleum refining tail gas monitoring and power plant gas metering. 3 The heat dissipation mass flow meter is based on the corresponding relationship between the power consumption of the heating element and the flow rate, and dynamically adjusts the power supply to maintain the constant temperature of the element during operation. The outstanding advantages lie in: • Millisecond level response speed, meeting the real-time requirements of process control - suitable for working conditions such as compressed air metering, boiler combustion gas regulation, etc. that require rapid feedback
2. Types and pr
Types and principles of mass flow meters Mass flow meters are instruments that measure flow based on the mass of fluids, widely used in industrial fields such as petrochemicals, pharmaceuticals, food processing, aerospace, etc. There are various types of them, and the working principles of each type are also different. Here are several common mass flow meters and their principles:
1. Thermal mass flow meter principle: Thermal mass flow meters use the heat of the measured fluid to determine its mass flow rate. It is used in conjunction with both heating and temperature sensors, with electronic instruments measuring the resistance at the sensor location and converting it into a flow signal. When the fluid flows through the sensor, it will take away some of the heat to grind the slag, causing the temperature of the sensor to drop and the resistance to change. By measuring this resistance change, the mass flow rate of the fluid can be calculated.
2. Principle of Ultrasonic Mass Flow Meter: Ultrasonic mass flow meters use the relationship between the propagation speed of ultrasonic waves at a certain frequency in the fluid and the flow rate to measure the mass flow rate.
. It typically uses 2 to 4 sound sources and receivers to measure parameters such as the time and velocity of sound waves propagating in the fluid. Due to the influence of factors such as fluid density, flow velocity, and temperature on the propagation speed of ultrasound in fluids, the mass flow rate of the fluid can be calculated by measuring these parameters.III. Principle of Rotary Mass Flow Meter: Rotary mass flow meters use the force of fluid on the rotor to measure flow rate.
. When fluid f