I. Introduction to Xiamen Jingchuan Co., Ltd. JCVF Vortex Flow Meter:

The JCVF vortex flow meter is a volumetric flow meter based on the Karman vortex principle, used to measure the volume flow, standard condition volume flow, or mass flow of gases, steam, or liquids. It can also serve as a flow transmitter in automated control systems. This instrument employs advanced differential technology, combined with isolation and filtering measures, overcoming issues such as poor shock resistance and small signal data disorder common in similar products. It also utilizes unique sensor encapsulation technology and protective measures to ensure product reliability. The product comes in two types: basic and composite. The basic type measures a single flow signal, while the composite type can simultaneously measure temperature, pressure, and flow. Each type is available in integrated and split structures to accommodate different installation environments.

II. Working Principle of Xiamen Jingchuan Co., Ltd. JCVF Vortex Flow Meter:               

The vortex flow meter consists of a vortex generator designed in the flow field, a detection probe, and corresponding electronic circuits. When fluid flows past the vortex generator, alternating rows of vortices form on both sides, known as Karman vortex streets. Based on the Karman vortex street theory, Strouhal further proposed that the frequency of the Karman vortex street is proportional to the fluid velocity and provided the relationship: f

= St × V/d   Where:  

f Vortex shedding frequency (Hz)

V Average flow velocity on both sides of the vortex generator (m/s)

St Strouhal coefficient (constant)                                            

These alternating vortices create a series of alternating negative pressures that act on the detection probe, generating a series of alternating electrical signals. After conversion, shaping, and amplification by the preamplifier, a pulse frequency signal (or standard signal) proportional to the vortex synchronization is output.

III. Features and Applications of Xiamen Jingchuan Co., Ltd. JCVF Vortex Flow Meter:  

· No moving parts, long-term stability, simple structure for easy installation and maintenance;   

· Uses anti-interference circuits and vibration-resistant sensor heads, providing certain resistance to environmental vibrations;  

· Employs ultra-low power consumption microcontroller technology; a single 3.2V 10AH lithium battery can last over 5 years;   

· Software corrects nonlinear meter coefficients to improve measurement accuracy;  

· Small pressure loss, wide rangeability;   

· Uses EEPROM for power-off protection of cumulative flow, with protection time exceeding 10 years;

IV. Technical Parameters of Xiamen Jingchuan Co., Ltd. JCVF Vortex Flow Meter:

1. Measured medium: Steam, gas, liquid.

2. The sensor's sensing element does not directly contact the measured medium, ensuring stable performance and high reliability.

3. The sensor has no moving parts, with a simple and robust structure, small pressure loss, minimal maintenance, and long service life.

4. Wide rangeability up to 10:1~15:1.

5. Vortex flow meter measurement range: Normal operating range, Reynolds number 20,000-7,000,000; output signal is unaffected by liquid temperature, pressure, viscosity, or composition. Possible measurement range, Reynolds number 8,000-7,000,000.

6. Accuracy class: Liquid, ±1.0% of indicated value; Gas, ±1.0% of indicated value; Steam, ±1.5% of indicated value.

7. Output signal: a. Voltage pulse: Low level: 0-1V; High level: greater than 4V; Duty cycle: 50%;

b. Current 4-20mA (three-wire system).

8. Power supply voltage: +12VDC; +24VDC.

9. Medium temperature: Standard type a. -40℃ to +130℃; b. -10℃ to +250℃; High-temperature type a. -10℃ to +350℃; b. -10℃ to +380℃;

10. Working pressure: 0-2.5Mpa, flange clamp connection (Note: Other pressure ratings can be provided upon customer request, custom-made).

11. Pressure loss: ΔP=ΔP=1.079*10-6*ρ*v2

(Where: ΔP: Pressure loss in kPa; ρ: Density of the measured medium in kg/m3; V: Flow velocity of the measured medium in m/s).

12. Housing material: Carbon steel; Stainless steel (1Cr18Ni9Ti).

13. Specifications (pipe inner diameter): 20, 25, 32, 40, 50, 65, 80, 125, 150, 200, 250, 300 (insertion type for diameters larger than DN300).

14. Ambient temperature: -25℃ to +55℃; Humidity ≤85% RH.

15. Explosion-proof type: Intrinsically safe; Explosion-proof marking: iaIIcT6.

V. Measured Medium for Xiamen Jingchuan Co., Ltd. JCVF:

Saturated steam, superheated steam, various gases (coal gas, air, hydrogen, natural gas, nitrogen, liquefied petroleum gas, flue gas, fuel gas, biogas, carbon dioxide, oxygen, compressed air, saturated steam, superheated steam, sulfur dioxide, ammonia, steam, liquids, and water.