Thermal gas mass flowmeter

supplyThermal gas mass flowmeter

Thermal gas mass flowmeterIt is based on the principle that the rate of heat absorption is directly related to the mass flow rate. The sensor of this instrument consists of two reference level thermal resistors (platinum RTDs). One is the mass velocity sensor T1, and the other is the temperature sensor T2 that measures changes in gas temperature. When these two RTDs are placed in the measured gas, sensor T1 is heated to a constant temperature difference above the gas temperature, while sensor T2 is used to sense the temperature of the measured gas. As the gas mass flow rate increases, the airflow carries away more heat, causing the temperature of sensor T1 to decrease. To maintain a constant temperature difference between T1 and T2, the heating power of T1 needs to be increased. According to the King's law of thermal effects. When moving gas molecules collide with a thermistor, they absorb and carry away heat. The larger the flow rate, the more molecules come into contact with the thermistor, and the more heat is absorbed. Heat absorption is related to the number of molecules, thermal properties, and flow characteristics of a certain gas. There is a definite mathematical relationship between heating power P, temperature difference △ T (T1-T2), and mass flow rate Q.
P/△ T=K1+K2 f(Q)K3
K1, K2, and K3 are constants related to the physical properties of gases.

Thermal gas mass flowmeterDifferent from other gas flow meters, it does not require pressure and temperature correction and directly measures the mass flow rate of gas. It is a true direct mass flow meter, and a sensor can achieve a range from extremely low to high.

supplyThermal gas mass flowmeterScope of application

Measurement of oxygen, nitrogen, hydrogen, chlorine, and multi-component gases. (excluding acetylene gas).
Measurement of blast furnace gas and coke oven gas. (Coke oven gas with high tar content can use new materials that do not stick to oil, which have been successfully applied)
Measurement of flue gas or rectangular pipes.
Aeration and chlorine gas measurement in biogas and water treatment.
Compressed air measurement. The most ideal.
Measurement of gas flow rates such as natural gas, liquefied gas, and flare gas.
Measurement of primary and secondary air flow in power plant blast furnaces.
Measurement of flow rate in underground ventilation or exhaust systems.

Measurement of nitrogen in fertilizer plants.

Main technical indicators

Ordering Notice: When placing an order, please specify the measurement range, basic error, working environment temperature, and transmission type; Materials for liquid contact, anti-corrosion requirements, connection methods, etc. Special specifications can be negotiated and ordered.

The final product model is determined by the supplier. To avoid unnecessary losses caused by customers making mistakes or omissions. Please read this manual carefully and keep it properly before using this product.

Characteristics

Measuring gas mass flow rate does not require temperature or pressure compensation and is independent of the physical properties of the measured medium. Sensor diameter: 3mm/4mm/5mm
Large range ratio, measuring flow velocity range: 0.1Nm/s to 100Nm/s. Display instantaneous and cumulative traffic on the same screen.
No pressure loss, suitable for any shape of pipeline with known cross-sectional area.
Corrosion resistant sensor, suitable for measuring corrosive gases. Different gas coefficient settings are applicable to different gas settings.
The expert algorithm for the full range range is particularly suitable for large-diameter measurements, ensuring measurement accuracy and suitable for trade settlement.

Accuracy: 1.0 reading, 0.5 full-scale. Insertion rod diameter: 19mm

N can perform excellent leak detection and equipment work for process pipelines.

Due to its plug-in structure, it can be installed and maintained online. Base type instruments can display on-site and have alarm control. The requirements for the front and rear straight pipe sections are relatively low.

Installation structure diagram:

Imported products from the United States:

Installation methods: plug-in type, pipeline type (flange installation).

Some small thermal gas flow meters in the company have high measurement accuracy, wide range, and high stability. Can connect various quick connectors.

Range: 0-10/200/1000 (L/M). Optional output signal: RS485 or 0.5-4.5 DCV/no 4-20mA output. But it can be converted into 4-20 outputs through modules.

Product warranty: Maintenance and repair of products that exceed the 12-month warranty period can be resolved through negotiation. Output 0.5-4.5DCV signal and module can convert 4-20mA signal.

Tip: Corrosive media should be explained. The measurement of a single gas is more ideal. Multiple component gases are also acceptable, and it should be indicated that the gas components have achieved the desired measurement effect. Please contact the company for detailed information. Easy to install, lightweight, and can be disassembled without stopping production, it is an ideal instrument for medical, laboratory, and scientific research. This product is strictly produced in accordance with the ISO9000 quality management system.

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