Matters needing attention in various occasions of gas flowmeter

Matters needing attention in various occasions of gas flowmeter The basic principle of gas flowmeter When the fluid flowing along the axial direction enters the flow sensor, the blades force the fluid to rotate, thus generating a vortex flow in the center of the vortex sprawl. The vortex flow precesses in the Venturi tube, and when it reaches the contraction section, it is suddenly throttled to accelerate the vortex flow. When the fluid flowing along the axial direction enters the flow sensor. When the vortex flow enters the diffusion section, it is forced to perform a precession secondary rotation due to the effect of backflow. At this time, the rotation frequency of the vortex flow is proportional to the flow rate of the medium and is linear. The weak charge signal detected by the piezoelectric sensor is amplified, filtered, and shaped by the preamplifier, and then becomes a pulse signal whose frequency is proportional to the flow velocity, and finally sent to the integrator for counting processing. The gas flow meter is a precision flow measuring instrument, which can be used to measure the flow and total amount of a liquid when matched with the corresponding flow totalizing instrument and on-site display meter. It is widely used in measurement and control systems in petroleum, chemical industry, metallurgy, scientific research and other fields. Especially suitable for the measurement of natural gas, dry gas, compressed air, etc. 1.1 Matters needing attention when transporting In order to prevent damage, please use the original packaging before transporting the flowmeter to the user's place of use. 1.2 Matters needing attention in storage After the gas flow meter arrives, it should be installed in time. For the battery-powered LRT-I meter, the power pin should be placed in the“OFF”(disconnected) position, so as not to affect the service life of the battery due to battery power consumption. If you need to store, please pay attention to the following items: a) Store without opening the packing box if possible. b) If the package has been opened, or the instrument has been used, please insert the power jumper of the LRT-I meter head into the“OFF”location, and in original packaging. The storage place should meet the following conditions: a) Rainproof and moisture-proof; b) Small mechanical vibration, avoid collision and shock; c) Temperature between -30～+60℃. The ideal temperature is around 25°C. d) If it is stored outdoors, the performance of the instrument will be affected. Therefore, once the instrument is transported to the installation site, it must be installed as soon as possible. 1.3 Matters needing attention in selecting the installation site of the gas flowmeter The design of the gas flowmeter has taken into account the situation under harsh environmental conditions, but in order to maintain its accuracy and stability for a long time, the following items must be paid attention to when selecting the installation location: Ambient temperature: Avoid installing in places where the ambient temperature changes greatly. If it is subjected to heat radiation from the equipment, measures for heat insulation and ventilation must be provided. Ambient air: Avoid installing the flowmeter in an environment containing corrosive gases. If it must be installed in such an environment, ventilation measures must be provided. Mechanical vibration and shock: The structure of the instrument is very strong, but when choosing the installation place, mechanical vibration or collision shock should be avoided as much as possible. If the instrument is installed on a pipeline with high vibration, the pipeline needs to be supported. Others: There should be sufficient space around the gas flow meter for installation and regular maintenance. 1.4 Matters needing attention when restricting the use of radio transceivers The electrical part of the flowmeter is resistant to high-frequency electrical noise interference. But if the radio transceiver is used too close to the meter, high frequency noise interference will affect the meter. Check the place where the meter is installed to see if the meter is affected by the radio transceiver (move the radio transceiver from a few meters away to the meter to see if it is affected). If so, move the transceiver away from the location. 1.5 Precautions for installation of explosion-proof instruments The design of the gas flowmeter can be used for“General Requirements for Electrical Equipment Used in Explosive Atmospheres (GB3836.1)”,“Explosion-proof electrical equipment for explosive atmospheres Flameproof electrical equipment“d””and“Explosion-proof electrical equipment for explosive atmospheres Intrinsically safe circuits and electrical equipment“i””Zone 1 and 2 hazardous areas according to the standard. The flow totalizer is composed of temperature and pressure detection analog channels and a micro-processing unit, and is equipped with an external signal interface to output various signals. The microprocessor in the flowmeter can check the medium density and pressure according to the detected medium temperature value, and complete the detection of the volume flow and mass flow of the medium. The microprocessor in the flowmeter can perform temperature and pressure compensation according to the gas state equation, and automatically correct the compressibility factor. The gas flowmeter can detect the temperature and pressure of the medium, and the well will automatically compensate and correct the compression factor accordingly. It can also directly detect the standard volume of gas or the mass flow rate of saturated steam. It adopts advanced microcomputer technology and high-performance integrated chip, and uses advanced micro-power consumption high-tech, and the power consumption of the whole machine is low. The flowmeter can not only run for a long time with internal battery power supply, but also can be powered by external power supply. LCD display, clear and intuitive, easy to read. With pulse signal output, it can also output 4 ~ 20MA standard analog signal according to user needs. The RS485 interface is used to network with the host computer. Each upper computer can carry 64 flowmeters, and only two communication lines are required. The installation cost is low, and it is convenient for users to centralize management. The performance of the gas flowmeter is stable, and the installation and maintenance are relatively simple. In the specific work, the data provided by the flowmeter is analyzed, and the work can be arranged in a targeted manner and work efficiency can be improved.

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