Type of gas flowmeter

Types of gas meter, gas meter is a basic principle of using liquid vibration and design a new type of flowmeter, widely used in petroleum, chemical, metallurgical industry, paper industry and other manufacturing industries the metrological verification of fluid mechanics, the flowmeter can't move artifacts, strong credibility, high precision, long life, can be in wide flow rate range accurately measuring the instantaneous velocity of the liquid flow rate and total flow.It will not be harmed by material temperature, working pressure, viscosity and composition, in addition, it is not blocked, not stuck, not easy to scale, heat resistance, high pressure, safety explosion-proof, suitable for extreme natural environment.Flow scoring integrated display information and remote display information, and can output differential signal or current data signal connected to the microcomputer network.

Type of gas flowmeter

Performance characteristics of gas flowmeter:

 

1. No temperature and pressure compensation is required for gas flow measurement, which is convenient and accurate.The mass flow rate or standard volume flow rate of the gas can be obtained.

 

2. Gas with measurable flow rates up to 100Nm/s and down to 0.5nm /s can be used for gas leak detection.

 

3. Good anti-seismic performance and long service life.The sensor has no moving parts and pressure-sensitive parts and is not affected by vibration to the measurement accuracy.

 

4. Easy installation and maintenance.In the field conditions allow, can not stop production installation and maintenance.

 

5. Digital design.The whole machine digital circuit measurement, measurement accuracy, easy to maintain.

 

Vortex flowmeter

 

It is mainly used for measuring the flow of industrial pipeline media, such as gas and steam.It is characterized by small pressure loss, large measuring range and high accuracy, and is almost unaffected by fluid density, pressure, temperature, viscosity and other parameters when measuring volume flow in working conditions.No moving mechanical parts, so high reliability, small maintenance.Instrument parameters can be stable for a long time.The vortex flowmeter adopts piezoelectric stress sensor with high reliability and can operate in the operating temperature range of -20℃ ~ +250℃.There are analog standard signals, but also digital pulse signal output, easy to use with computer and other digital systems, is a more advanced, ideal measurement instrument.The range is very wide, the price is relatively cheap, the application is wide.

 

Rotary vortex flowmeter

 

The flow profile of the flow sensor is similar to the profile of the venturi tube, and a set of helical guide vanes are placed at the inlet side. When the fluid enters the flow sensor, the guide vanes force the fluid to produce violent vortex flow.When the fluid enters the diffusion section, the vortex flow is affected by the backflow and begins to make secondary rotation, forming a gyroscopic vortex precession phenomenon.The precession frequency is proportional to the flow rate and is not affected by the physical properties and density of the fluid. The second rotational precession frequency of the fluid measured by the detection element can obtain good linearity in a wide flow range.The signals are amplified, filtered, and transformed into pulse signals proportional to the flow rate by preamplifier, and then sent to the microprocessor for integration processing along with temperature, pressure and other detection signals. After *, the measurement results (instantaneous flow, cumulative flow, temperature and pressure data) are displayed on the LCD screen.The price is relatively medium, and the measuring range of gas is slightly lower, which is mostly used to measure the fuel gas such as natural gas, liquefied petroleum gas and oxygen and hydrogen.

 

Turbine flowmeter

 

The gas turbine flowmeter is measured by the turbine.It first converts the flow rate into the speed of the turbine, and then converts the speed into an electrical signal proportional to the flow rate.This kind of flowmeter is used for detecting instantaneous flow and total integrated flow, and its output signal is frequency, which is easy to be digitized.The induction coil is attached to the housing together with the ** magnet.When the ferromagnetic turbine blade passes through the magnet, the magnetic resistance of the magnetic circuit changes, thus producing the induction signal.The signal is amplified and shaped by the amplifier and sent to a counter or frequency meter to show the total cumulative flow.At the same time, the pulse frequency is transferred through a frequency-voltage conversion to indicate the instantaneous flow rate.The rotating speed of the impeller is proportional to the flow, and the revolution of the impeller is proportional to the total amount of flow.The output of the turbine flowmeter is a frequency modulated signal, which not only improves the anti-interference of the detection circuit, but also simplifies the flow detection system.It has a range ratio of 10:1 and an accuracy within ±0.2%.The time constant of turbine flowmeter with small inertia and small size can reach 0.01 second.Gas turbine flowmeter is a relatively ideal trade settlement gas flowmeter, which can display temperature, pressure, instantaneous flow, cumulative flow, daily cumulative flow, etc.

 

Power bar flowmeter

 

The willy bar flowmeter is a plug-in flow meter.A powerbar sensor is inserted into the pipe. As the fluid flows through the sensor, a high pressure distribution area is generated in the direction of inflow in the front of the sensor, and a low pressure distribution area is generated in the rear of the sensor.In the areas of high and low pressure, sensors have multiple pairs arranged according to certain rules, which are generally three pairs of pressure holes. The total pressure of the fluid is measured respectively, including static pressure, average velocity pressure Pl and static pressure P2.P1 and P2 are introduced into the differential pressure transmitter, respectively, to measure travel pressure delta P=P1-P2, delta P reflects the size of the average velocity of the fluid, so as to calculate the flow of the fluid.Is a typical differential pressure flowmeter, technology from the United States, widely used in large pipeline low velocity occasions, with a high precision differential pressure transmitter, the realization of large pipeline low velocity gas measurement, simple cost, very good gas flowmeter

 

Porcelain city Shanghai instruments co., LTD. Is China's first tiny elliptical gear manufacturers, by Mr Stone (Siemens) senior engineers involved research and development, with independent intellectual property rights, completely using Siemens CNC processing center production and processing equipment, to ensure the minimum flow rate of 0.1 ml/min, which is rare in the world, the precision is over 90%.

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