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Compressed air flow meter, air flow meter
1、 Introduction to Xiamen Jingchuan JCVF Compressed Air Flow Meter:
JCVF type compressed air flowmeter is a volumetric flowmeter that measures the volumetric flow rate, standard condition volumetric flow rate, or mass flow rate of gases, vapors, or liquids based on the Karman vortex principle. And it can be used as a flow transmitter in automation control systems. This instrument adopts advanced differential technology, combined with isolation, shielding, filtering and other measures, to overcome the problems of poor seismic resistance and small signal data disorder of similar products. It also adopts unique sensor packaging technology and protective measures to ensure the reliability of the product. The product comes in two forms: basic type and composite type. The basic type measures a single flow signal; The composite type can simultaneously measure temperature, pressure, and flow rate. Each form has a whole or separate structure to adapt to different installation environments.
IIWorking principle of Xiamen Jingchuan JCVF compressed air flowmeter:
A vortex flowmeter is composed of a vortex generator designed in the flow field, a detection probe, and corresponding electronic circuits. When the fluid flows through a vortex generator, two alternating rows of vortices are formed on both sides, which are called Karman vortex streets. Based on the theory of Karman vortex street, Strohal proposed that the frequency of Karman vortex street is proportional to the flow velocity of the fluid, and gave the relationship between frequency and flow velocity:
f = St × V/d 式中:Frequency of vortex street occurrence (Hz)Average velocity on both sides of the vortex generator (m/s)St Strohal coefficient (constant)These alternating vortices form a series of alternating negative pressures, which act on the detection probe to generate a series of alternating electrical signals. After conversion, shaping, and amplification by a preamplifier, the output is a pulse frequency signal (or standard signal) proportional to the synchronization with the vortices.IIICharacteristics and Applications of Xiamen Jingchuan JCVF Compressed Air Flow Meter: ·No movable parts, long-term stability, simple structure for easy installation and maintenance;·Adopting anti-interference circuit and anti vibration sensing head, it has certain anti environmental vibration performance;·Adopting ultra-low power single-chip microcomputer technology, one 3.2V10AH lithium battery can be used for more than 5 years;·Correction of instrument coefficient nonlinearity by software to improve measurement accuracy;·Low pressure loss and wide range of measurement;·Using EEPROM for power down protection of accumulated traffic, with a protection time greater than 10 years;
4Xiamen Jingchuan JCVF Compressed Air Flow MeterTechnical Specifications:1. Measurement media: steam, gas, liquid.2. The sensing element of the sensor does not directly contact the measured medium, and its performance is stable and reliable.3. The sensor has no movable parts inside, a simple and sturdy structure, low pressure loss, small expansion capacity, and long service life.4. The range is wide from 10:1 to 15:1.5. Measurement range of vortex flowmeter: normal operating range, Reynolds number is 20000-700000; The output signal is not affected by liquid temperature, pressure, viscosity, and composition. Possible measurement range, Reynolds number 8000-700000.6. Accuracy level: Liquid, ± 1.0% of indicated value; Gas, with an indication value of ± 1.0%; Steam, with an indication value of ± 1.5%.7. Output signal: a. Voltage pulse low level: 0-1V; high level: greater than 4V; duty cycle is 50%; b. Current 4-20mA (three wire system).8. Power supply voltage:+12VDC; +24VDC。9. Medium temperature: ordinary type a. -40 ℃~+130 ℃; b.-10℃～+250℃; High temperature type a. -10 ℃~+350 ℃；b. -10℃～+380℃;10. Working pressure: 0-2.5Mpa, flange clamping connection (note: other pressure levels can be provided upon user request, customization is required).11. Pressure loss: Δ P=Δ P=1.079 * 10-6 * ρ * v2 (where Δ P: pressure loss kpa; ρ: The density of the tested medium is kg/m3; V: The flow velocity of the measured medium is m/s.12. Shell material: carbon steel; Stainless steel (1Cr18Ni9Ti).13. Specifications (inner diameter of pipeline): 20, 25, 32, 40, 50, 65, 80, 125, 150, 200, 250, 300 (for diameters larger than DN300, insert type).14. Environmental temperature -25 ℃~+55 ℃; Humidity ≤ 85% RH.15. Explosion proof type: intrinsic safety type; Explosion proof mark; iaIIcT6。
5Xiamen Jingchuan JCVF Compressed Air Flow Metermeasuring medium： Saturated steam, superheated steamCan be used for various gases (coal gas, air, hydrogen, natural gas, nitrogen, liquefied petroleum gas, flue gas, gas, biogas, carbon dioxide, oxygen, compressed air, etc.)Saturated steam, superheated steamSulfur dioxide, ammonia, steam, liquid, and water. 6、 Measurement range and working pressure of Xiamen Jingchuan JCVF compressed air flowmeter
Applicable flow rates for general liquids and gases
7Xiamen Jingchuan JCVF Compressed Air Flow MeterModel and Function Selection: JCVF— ☐☐☐☐—☐☐☐☐—☐☐☐☐—☐☐☐☐Connection form: 1Flange connection type 2 flange card installation type
B-Measurable medium: 1 gas, 2 liquid, 3 vaporC-Vortex Street Caliber: DN15-300 (mm)
D structural form: Z integrated instrument F split instrumentD converter type: 0 sensor type 1 transmitter type 2 intelligent type 3 temperature and pressure compensation type
E-Explosion proof grade: 0 standard type, non explosion proof 2 explosion-proof type, explosion-proof grade Exd Ⅱ CT6
F-Voltage rating: N Conventional H (X) High voltage (negotiable order)
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