Selection of gas flowmetermethod

1、 Before selecting, clarify 5 key conditions

1. measuring mediumAir, nitrogen, oxygen, natural gas, coal gas, steam, flue gas, compressed air, corrosive gases, etc

2. Working condition status: Room temperature/high temperature, atmospheric pressure/high pressure, clean/dusty/humid/corrosive

3. flow rangeMinimum traffic, common trafficmaximumtraffic

4. 管道口径：DN10～DN2000

5. Output requirementsOn site display, 4-20mA, pulse, RS485, 4G/NB IoT remote transmission

2、 The core selection basis for the application scope of commonly used gas flow meters

1. Vortex flowmeter (universal type, suitable for liquids/gases/vapors)

• Air, compressed air, nitrogen, oxygen, carbon dioxide, natural gas, coal gas, flue gas, etc

  characteristic

• No movable parts, durable and stable

• High temperature and high pressure resistance

• Good accuracy and moderate cost

  Not applicable

• Extremely low flow rate, large pulsation, high dust content, strong corrosive gas

• General gas, medium flow rate →preferredvortex street

• High temperature gas, steam → priority vortex street

2. Gas turbine flowmeter (high-precision clean gas)

• Natural gas, liquefied gas, nitrogen, oxygen, compressed air, etcClean, low viscosity gas

  characteristic

• High precision and fast response

• Small size and easy installation

• Suitable for trade measurement

  Not applicable

• Containing dust, moisture, corrosive gases, and oily gases

• Clean gas, high precision, trade settlement → Select gas turbine

3. Thermal gas mass flowmeter (low flow rate, large diameter)）

• Air, smoke, exhaust gas, biogas, gas, low flow rate gas

  characteristic

• Measurable extremely low flow velocity

• The advantages of large caliber and small flow are obvious

• Directly measure mass flow without temperature and pressure compensation

  Not applicable

• Gases with high temperature, high humidity, easy condensation, strong corrosion, and high dust content

• Low flow rate, large diameter, exhaust gas/smoke/air → thermal mass flowmeter

4. Roots flowmeter (waist wheel flowmeter, high-precision natural gas)

• Natural gas, coal gas, liquefied gas, industrial gas

  characteristic

• essencedegreetall，Suitable for trade settlement

• Wide range ratio, resistant to dirt and small amounts of impurities

• Suitable for high pressure and high flow

  shortcoming

• Large size and high price

• Gas trade settlement, industrial gas metering → Roots (waist wheel) flowmeter

5. Metal float (rotor) flowmeter (small flow, intuitive)

• Small flow air, nitrogen, oxygen, laboratory small flow, small caliber

characteristic

• Simple and intuitive structure, no need for power supply

• The advantage of low traffic is obvious

  shortcoming

• Average accuracy, small caliber

• Small flow rate, small diameter, on-site indication → Metal float

6. Ultrasonic gas flowmeter (non-contact, large diameter, no pressure loss)

• Natural gas, coal gas, air, and flue gas

  characteristic

• No pressure loss, continuous pipe can be installed

• The advantage of large caliber is obvious

  shortcoming

• Easy to be affected by dust, humidity, and interference

• Large caliber, non-stop renovation, no pressure loss requirements → Ultrasonic gas flowmeter

3、 According to the mediumSelection of gas flowmetermethodsuggestion

1. Compressed air, air, nitrogen, oxygen

   → Vortex Street/Gas Turbine/Thermal Mass

2. Natural gas, liquefied gas, gas (trade measurement)

   → Roots flowmeter/gas turbine

3. Smoke, exhaust gas, low flow rate, large diameter

   → Thermal gas mass flowmeter

4. High temperature gas, steam

   Vortex flowmeter

5. Small flow, laboratory, small caliber

   → Metal float flowmeter

6. Large caliber, continuous pipe, no pressure loss

   → Ultrasonic gas flowmeter

4、 Select based on working conditions

1. high-temperature gas

   Vortex Street, High Temperature Thermal Mass

2. high-pressure gas

   → Vortex street, gas turbine, Roots

3. corrosive gas

   → Anti corrosion vortex street, PTFE lined vortex street, anti-corrosion thermal type

4. Containing dust and impurities

   → Roots, vortex street (without selecting turbine)

5. low flow rate

   → Thermal mass flowmeter

6. Explosion proof occasions

   Explosion proof certified turbine, vortex street, Roots

5、 Remarks and after-sales service

remark

1. The displayed prices in the system are only reference prices and not actual transaction prices;

2. Gas flow meters may vary in price due to differences in specifications, diameters, materials, configurations, and operating conditions. Accurate pricing should be provided based on the actual operating conditions after selection.

After sales and warranty

• All product warranties2 years；

• Provide free technical services such as telephone consultation, installation and debugging guidance;

• We can negotiate on-site guidance for installation and debugging, and only charge reasonable travel expenses;

• Bulk procurement can provide free on-site guidance for installation and debugging.