The thermal gas mass flowmeter is an instrument that measures the fluid flow based on the principle of heat conduction. The instrument uses the constant temperature difference method to accurately measure the gas mass flow. The thermal gas mass flowmeter has the advantages of small volume, high degree of digitalization, convenient installation and accurate measurement.

1、 Technical advantages of thermal gas mass flowmeter products:

1. Unique traffic data model algorithm; Fuzzy theory control temperature and humidity algorithm;

2. High-performance intelligent microprocessor and analog-to-digital and analog-to-analog conversion chip;

3. Wide range ratio 1000:1; Large diameter, low flow rate, negligible pressure loss;

4. Direct measurement of mass flow without temperature and pressure compensation;

5. Low flow rate measurement is very sensitive;

6. Convenient design and model selection, easy installation and use;

7. Suitable for all kinds of single or mixed gas flow measurement.

2、 Features of thermal gas mass flowmeter:

1. Adopt platinum RTD sensor technology with high stability

2. Adopt the technology of "balanced structure packaging" and self-compensation of medium temperature

3. Unique algorithm, which can achieve high linearity, high repeatability and high precision

4. The range ratio is 1000:1, which can be expanded according to user requirements

5. Large pipe diameter and small flow measurement can be realized, and * * * small flow can be measured as low as zero, with a resolution of 0.001m/s

6. No moving parts, vibration effect can be ignored

7. Requirements for straight pipe section are not high 1-2D

8. It is independent of the temperature and pressure of the medium

9. Unique high temperature algorithm, medium temperature can reach+400 ℃,

10. Adopt high humidity algorithm to achieve high precision measurement

11. Input 12-point dynamic correction for the flow signal, and built-in 10-point correction

12. On-line dynamic correction of current/voltage output

13. Not sensitive to small particles such as dust

14. On-line loading and unloading without interruption, convenient for maintenance

3、 Applications of thermal gas mass flowmeter:

1. Utilities - electricity, gas and water treatment******

Gas in pipeline; Common system; Biogas; Gas; natural gas; liquid gas; Boiler preheating air

2. Oil and gas industry

Energy exchange; Well filling gas recovery; Gas metering; Gas quality analysis; Leakage test; Natural gas measurement; Flare gas******

3. Power industry

Gas measurement during gas distribution in the fuel system; 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. Chemical industry

Flue gas circulation monitoring; Gas flow measurement in the sampling system; Gas flow metering of induced draft fan; Ammonia measurement in fertilizer plant; Measurement of various gas flow in battery factory

5. Metallurgical industry

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

6. Pulp and paper industry

Measurement of gas in wastewater treatment system; Flue flow; The boiler recovers secondary/tertiary air; Measurement of gas and air supply of boiler

7. Food and medicine industry

Adding fresh air in processing operation; Carbon dioxide treatment in breweries; The flow of hot air in the bottle sterilizer; Gas flow measurement during thermal oxidation; Ventilation system; Boiler inlet, exhaust gas and process control

8. Environmental protection

Gas measurement during biogas utilization*** * * * gas measurement during gas treatment; Gas measurement of aeration tank during sewage treatment; Monitoring the displacement of SO2 and NOX in flue gas

9. Other industries

Factory compressed air measurement; The pulverized coal/gas ratio control fuel during pulverized coal combustion; Flow control of hot gas discharged from vertical mill in cement industry

4、 Performance index of thermal gas mass flowmeter:

1. Measuring range: 0.5-100Nm/s (20 ℃, 101.33KPa)

2. Accuracy: ± 1.5% of reading ± 1.5% of full scale

3. Range ratio: usually 100:1 (depending on the range of calibrated flow)

4. Pipe diameter range: 15mm~6000mm

5. Application range: suitable for various single or mixed gases. Dust, sand, moisture and various corrosive gases. (except acetylene gas)

6. Ambient temperature range: - 40 ℃~+85 ℃ (no display)- 30 ℃~+70 ℃ (with display); Humidity is less than 90% RH

7. Medium temperature range: - 40 ℃~+100 ℃- 40℃～+200℃；- 40℃～+450℃；- 40℃～+510℃

8. Sensor diameter: ф 3、 ф two point five

9. Diameter of probe rod of plug-in sensor: ф 19 (standard) ф 16、 ф twelve

10. Sensor material: 316 stainless steel, Hastelloy, titanium

11. Probe rod material (protective sleeve): 316 stainless steel (standard), Hastelloy

12. Two-way measurement of medium flow

13. Analog output: flow: 4-20mADC, temperature: 4-20mADC, * * * large load: 1000 Ω

14. Cumulative impulse output

15. Type 12 segments of nonlinear correction, and 10 segments of nonlinear correction are built in

16. Communication: serial port output RS232/RS485

17. Power supply: 24VDC/600mA; 220VAC/2W； 110VAC/3W

18. Alarm: 1-2 relay outputs, 5A/220V, 5A/30VDC, input setting

19. Large screen LCD display: 7-bit instantaneous flow, 8-bit cumulative flow

20. Process pressure: 1.6Mpa (Zui is greater than 20MPa)

21. Installation process form: plug-in type (ferrule, ferrule+ball valve, flange connection) is applicable to the installation of pipes above DN80, and pipeline type (flange, thread connection) is applicable to the installation of pipes above DN15.

22. Explosion-proof grade: intrinsically safe (ia Ⅱ CT5), flameproof (Exd Ⅱ CT4)