China thermal gas mass flow meter products is designed based on the principle of heat conduction technology and combined with Newton's law of thermodynamics to directly measure the mass flow or standard condition flow by measuring the heat taken away by the medium in the pipeline when passing through the probe. It can be widely used in mass flow and standard flow measurement of various gases without temperature and pressure compensation. The product measurement method adopts constant power design, which has the characteristics of extremely low measurement lower limit, wide range ratio, high measurement accuracy, simple installation and so on. Products are widely used in compressed air, gas extraction, natural gas measurement, aeration measurement, emission gas monitoring, process gas control and many other fields.

Product features of china thermal gas mass flow meter products

Plug in design, can be installed online under pressure;

china thermal gas mass flow meter is suitable for pipes of any shape with a variety of pipe diameters and known cross-sectional areas;

Large range ratio and wide measuring flow rate range;

No movable parts, no pressure loss;

Measuring gas mass flow without temperature and pressure compensation;

Fully isolated electrical structure can completely filter out external interference;

Energy efficient power supply design, the power consumption of the whole machine is very low;

Wide power supply voltage input range, suitable for various complex power supply environments;

Large screen LCD double line display, clear and easy to distinguish reading;

With MODBUS and Hart fieldbus interface.

China thermal gas mass flow meter products is an instrument for measuring gas flow based on the principle of thermal diffusion. The sensor consists of two reference stage RTDS. One is speed sensor RH and the other is temperature sensor RMG for measuring gas temperature change. When the two RTDS are placed in the measured gas, the sensor RH is heated and the other sensor RMG is used to sense the temperature of the measured gas. As the gas flow rate increases, the gas flow takes away more heat and the temperature of sensor RH decreases.

According to King's law of thermal effect, there is a definite mathematical relationship between heating power P, temperature difference △ t (trh-trmg) and mass flow Q.

P / △ t = K1 + K2 f (q) K3 K1, K2 and K3 are constants related to the physical properties of gas.

The unique temperature difference measurement method of china thermal gas mass flow meter products the disadvantage that the china thermal gas mass flow meter products based on the constant temperature difference principle can not be measured due to the great zero drift caused by water, oil and impurities in the gas. It can also be used to measure the mass flow of wet gas, such as the real-time detection of air volume (speed) in underground gas drainage, air supply and exhaust system.

Features of china thermal gas mass flow meter products:

● easy installation, simple maintenance, two-way detection and anti vibration

● up to 8-point flow measurement

● correction of output analog quantity and multipoint nonlinear curve correction

● wide range ratio 100:1

● simultaneous detection of flow and temperature, switching display

● large diameter and small flow measurement can be used for leakage detection

● sensor packaged with proprietary technology "double balanced structure"

● proprietary high humidity and high temperature algorithm, medium temperature up to 500 ℃

● direct mass flow detection without temperature and pressure compensation

Since the sensor temperature is always about 30 ℃ higher than the medium (ambient) temperature, the thermal gas flowmeter does not need temperature compensation in principle. The applicable medium temperature range of thermal gas mass flowmeter is generally - 10 ~ 200 ℃, and the higher level can reach - 40 ~ 450 ℃.

Application of thermal mass flowmeter:

1. Utilities - gas in monitoring pipelines for power, gas and water treatment; General system; Biogas; Gas; natural gas; liquid gas; Boiler preheating air

2. Energy exchange between oil and gas industry; Filling gas recovery; Gas metering; Gas quality analysis; Air leakage test; Natural gas measurement; Flare gas monitoring

3. Gas measurement during gas distribution in fuel system of power industry; Measurement of various gases in boiler and auxiliary system; Gas measurement in gas furnace; Hydrogen measurement; Measurement of primary air and secondary air of blast furnace in power plant

4. Flue gas circulation monitoring in chemical industry; Gas flow measurement in sampling system; Gas flow measurement of induced draft fan; Ammonia measurement in chemical fertilizer plant; Measurement of various gas flow in battery factory

5. Gas filling measurement of iron and steel plant in metallurgical industry; Measurement of blast furnace gas in ironmaking plant; Measurement of coke oven gas in coking plant; Measurement and control of heating furnace gas (blast furnace gas, coking gas, natural gas, etc.) in rolling mill; Control of hydrogen, oxygen, nitrogen and other gases in heat treatment quenching furnace

6. Measurement of gas in wastewater treatment system of pulp and paper industry; Flue flow monitoring; Boiler recovers secondary / tertiary air; Measurement of gas and air supply of boiler

7. Addition of fresh air in processing operations in food and pharmaceutical industries; Carbon dioxide treatment in breweries; The flow of hot air in the bottle sterilizer; Gas flow measurement during thermal oxidation; Ventilation system; Boiler air inlet, waste gas and process control

8. Gas measurement in the process of environmental protection biogas utilization; Measurement of chlorine gas during chlorine treatment; Gas measurement of aeration tank in sewage treatment process; Monitor SO2 and NOx emissions from flue gas of chimney

9. Compressed air measurement in other industries; Pulverized coal / gas ratio control fuel during pulverized coal combustion; Flow control of hot gas discharged from vertical mill in cement industry