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Liquefied gas flow meters are widely used in various fields of the national economy such as metallurgy, electric power, coal, chemical industry, petroleum, transportation, construction, textiles, food, medical environmental protection and people’s daily life. It is to develop industrial and agricultural production, save energy, and improve Product quality, an important tool for improving economic efficiency and management level occupies an important position in the national economy.
When the liquefied gas flowmeter is equipped with a triangular cylindrical vortex generator in the fluid, regular vortices are alternately generated from both sides of the vortex generator, and the vortex arrays are arranged asymmetrically downstream of the vortex generator.
Parameters and requirements
Measuring medium: gas, liquid, steam
Connection mode: snap-in type, flange type, plug-in type
Specification Flange card-mounted caliber selection 25, 32, 50, 80, 10
Liquefied gas flowmeter flange type diameter selection 100, 150, 200
Measurement accuracy of liquefied gas flowmeter 1.0 grade 1.5 grade
Measured medium temperature: -25℃～100℃
–25℃～150℃ -25℃～250℃
Liquefied gas flow meter operating environment Temperature: -25℃～+55℃ Humidity: 5～90% RH50℃
Material stainless steel, aluminum alloy
Power DC24V or lithium battery 3.6V
Explosion-proof grade Intrinsically safe type iaIIbT3-T6
The energy of liquefied gas flowmeter is divided into primary energy (coal, coal-bed methane, petroleum gas), secondary energy (electricity, coke, artificial gas, refined oil, liquefied petroleum gas, steam) and energy-carrying medium (compressed air, oxygen, Nitrogen, hydrogen, etc. Energy metering is an important means for scientifically managing energy, realizing energy saving and consumption reduction, and improving economic efficiency. Flow meters are an important part of energy measurement instruments. Commonly used energy sources such as water, artificial gas, natural gas, and steam all use an extremely large number of flow meters. They are indispensable tools for energy management and economic accounting.

The product has the characteristics of advanced circuit, low power consumption, wide range ratio, simple structure, small resistance loss, sturdiness and durability, wide use, long service life, stable work, easy installation and debugging.
Principle function characteristics
1. The temperature and pressure compensation function is integrated in the meter body of the liquefied gas flowmeter, which can measure the standard volume flow or standard mass flow of the fluid.
2. The liquefied gas flowmeter is fully intelligent and digital circuit design, which can automatically compensate for the density of the measured fluid or the calculation of the volume under standard conditions.
3. The new digital filtering and correction functions make the flow measurement more accurate and reliable.
4. The battery-powered type of liquefied gas flowmeter can work continuously for more than two years without external power supply.
5. The new dot matrix Chinese character LCD display of the liquefied gas flowmeter is more convenient to use and operate.
Liquefied gas flow meter application field

Main technical parameters of liquefied gas flowmeter

 
1. The liquefied gas flowmeter specifies the following working parameters.

(1) The name and composition of the tested medium

(2) Small, frequently used, and flow rate of working status

(3) Low, common, pressure and temperature of the medium

(4) The viscosity of the medium under working conditions

2. The liquefied gas flowmeter measures the volume flow rate of the medium in the working state, so the working state volume flow rate of the medium should be obtained according to the process parameters. The relevant formula is as follows:

(1) The volume flow rate of a known gas in the standard state can be passed through the following

Calculate the volume flow under working condition

 Formula (3)

(2) The standard state density ρ of the known gas can be obtained by the following formula:

Formula to find the density of working conditions

 Formula (4)

(3) The known mass flow rate Q m is converted to the volume flow rate Q v

 Formula (5)

Where:

Q v: volume flow of medium under working conditions (m 3 /h)

(Q v = 3600f /K K: meter coefficient)

Q o: The volume flow rate of the medium under standard conditions (Nm 3 /h)

Q m: mass flow rate (t/h)

ρ: The density of the medium under working conditions (kg/m 3)

ρ o: the density of the medium in the standard state (kg/m 3 ), the standard state density of the commonly used gas medium, see table (3)

P: Gauge pressure under working conditions (MPa)

t: temperature under working conditions (℃)

3. Determination of the lower limit flow rate of the liquefied gas flowmeter. The upper limit of the vortex flow meter is generally not calculated. The choice of the vortex flow meter caliber is mainly to calculate the lower limit of the flow. The calculation of the lower limit flow rate should meet two conditions: The small Reynolds number should not be lower than the limit Reynolds number (Re=2×10 4); the vortex intensity generated by the stress vortex flow meter at the lower limit flow rate should be greater than that of the sensor vortex intensity Allowable value (the vortex strength is proportional to the lift ρ v 2).