Chuanshuo DY65F seriesThermal gas mass flow meter

1DeyanPrinciple of Thermal Gas Mass Flow Meter

DeyanThe thermal mass flowmeter adopts the principle of thermal diffusion, which is a technology with excellent performance and high reliability under harsh conditions. Its typical sensing elements include two thermal resistors (platinum RTDs), one is a speed sensor and the other is a temperature sensor that automatically compensates for gas temperature changes. When two RTDs are placed in a medium, the velocity sensor is heated to a constant temperature above ambient temperature, while the other temperature sensor is used to sense the temperature of the medium. The mass flow rate of gas passing through the velocity sensor is calculated based on the heat transfer of the sensing element. As the gas flow rate increases, the heat carried away by the medium also increases. Causing the temperature of the sensor to decrease accordingly. In order to maintain a constant temperature, it is necessary to increase the working current through the sensor, and the magnitude of this increase in current is proportional to the flow rate of the medium.

IIDeyanIntroduction to Thermal Gas Mass Flow Meter:

At present, the gas flow meters used in China have the problem of small range ratio, and the flow below the lower limit of the range is basically lost. However, this is unacceptable in some fields, and it is even more unbearable in gas and other trade settlement situations. Thermal gas mass flow meters have successfully solved this problem.

1.DeyanCharacteristics of Thermal Gas Mass Flow Meter

Deyan dyqjThe series of thermal gas mass flow meters can be used for both gas flow measurement and process control applications. It introduces advanced technology from the United States for production, without the need for temperature and pressure compensation, and directly measures the mass flow rate of the fluid. Its prominent feature is: no movable parts; Low pressure loss; Wide range ratio; High precision; High reliability; Easy to install and operate. Can fully replace orifice plates and differential pressure flow meters in all fields.

2. Application of Thermal Gas Mass Flow Meter:

This product is widely used in industries such as steel plants, coking plants, petroleum, chemical, thermal, medical, thermal power plants, and environmental protection.

Can be done:

Measurement of Gas Flow in Steel and Coking Plants

Boiler air flow rate, measuring secondary air volume

Measurement of Smoke Flow from Chimney Emissions

Waterfall gas flow measurement in water treatment

Gas flow measurement in the production process of cement, cigarettes, and glass factories

Compressed air flow measurement

Measurement of gas flow rates for natural gas, coal gas, liquefied gas, torch gas, hydrogen, and other gases

3、 Technical parameters of DeYan thermal gas mass flowmeter:

Measurement range: (0.05-120) Nm/s (standard state is 20 ℃, 101.33KPa)

Measurement method: pipe segment insertion type

Temperature range: Environmental temperature:- 40℃～+60℃

Medium temperature:- 10℃～+450℃

Accuracy: ± 1% of readings; ± 0.5% full scale

Repeatability: ± 0.5% of full range

Output: 4-20mA DC (maximum load 600 Ω); RS232； RS485

Response speed: less than 1 second

Supply voltage: 24VDC ± 10%

Mechanical connection: 3/4NPT stainless steel fasteners (insert type); flange

Probe length: 300mm (this length is the standard insertion length, please specify if special)

Probe diameter: 19mm (insert type)

Length of straight pipe section: No strict requirements

Pressure loss: can be ignored

Work pressure: 1.6MPa; 7.3MPa

On site display: LED display; lcd display

Data protection: Accumulated data is stored in EEROM (can be saved for a hundred years after power failure)

Sensor and pipeline body material: 316L (optional Hastelloy C)

Protection level: IP65

Explosion proof grade: ExdIICT6

4DeyanThermal gas mass flow meterApplication examples

1. Petrochemical industry

Application scenario: Torch gas emission monitoring

Product advantages: Wide range ratio, sensor is not easily clogged, can be plugged and cleaned online, suitable for a wide range of gases

2. Power industry

Application scenario: Measurement of air volume for boiler primary air, secondary air, and coal grinding air

Product advantages: Easy installation, no straight pipe requirements, low pressure loss, no need for temperature and pressure compensation, can be used under harsh conditions (such as dust, particles, severe wear, low pressure, etc. in the air)

3. Metallurgical industry

Application: Measurement of blast furnace gas and coke oven gas

Product advantages: Calibrated according to the actual composition of the medium, the component changes can be corrected, the sensor can be cleaned online, and the insertion length can be adjusted arbitrarily

4. Electronic industry

Application scenario: High purity gas mass flow measurement

Product advantages: No need for temperature and pressure compensation to directly measure mass flow rate. The sensing head is highly polished and can be used for trade settlement

5. Heating, Ventilation, and Air Conditioning System (HVAC)

Product advantages: The product has sensitive response, reliable operation, and no strict requirements for installing straight pipe sections

6. Water treatment industry

Application scenario: Measuring the air flow rate of an aeration tank

Product advantages: dirt and dust resistance, truly no pressure drop, easy on-site installation

7. Food industry

Application scenario: Inject an appropriate amount of gas into the reactor to control the process and quality