-
Technical Specifications
| Input | ||||
| Measured variables | Flow velocity, temperature | |||
| Nominal diameter&flow rang | Nominal diameter | DN8 | DN10 | DN15 |
| Flow range | (1~15)L/min | (3~30)L/min | (5~50)L/min | |
| Temperature range | (0~90)℃ | |||
| Output | ||||
| Transmitter output | Flow/temperature (4~20) mA, load resistance ≤500Ω | |||
| Alarm output | Flow/temperature alarm, PNP alarm contact, contact capacity: 24V/50mA | |||
| Communication | RS485 interface, MODBUS-RTU | |||
| Electrical parameters | ||||
| Power supply | 24VDC | |||
| Power consumption | ＜3W | |||
| Electrical interface | M12*1.5 aviation plug | |||
| Performance parameters | ||||
| Accuracy | Flow rate: level 3 | |||
| Temperature: ±1℃ | ||||
| Insulation resistance | 50MΩ at 100VDC | |||
| Process conditions | ||||
| Media | Liquid (water or water-soluble liquid such as ethylene glycol) | |||
| Medium temperature | 0℃~90℃ | |||
| Process pressure | MAX 1.2MPa (at 40℃) | |||
| Environmental conditions | ||||
| Environmental conditions | Temperature: -20℃~85℃; Humidity: <95% | |||
| Protection level | IP65 | |||
-
Integrated Flow & Temperature Monitoring
Unlike conventional vortex meters, the FK-FVM200 integrates both:
-
Flow measurement
-
Temperature monitoring
This all-in-one design allows simultaneous acquisition of two critical parameters, improving process efficiency and reducing installation costs.
-
OLED Smart Display
The FK-FVM200 adopts a high-visibility OLED display with backlight, providing:
-
Real-time flow display
-
Real-time temperature display
-
Instantaneous and cumulative flow
-
Alarm indication
The display remains clear and readable in both bright and low-light industrial environments.
-
Applications
The FK-FVM200 miniature vortex flowmeter is suitable for measuring:
Steam Flow Measurement
-
Saturated steam
-
Superheated steam
-
Boiler steam monitoring
Gas Flow Measurement
-
Compressed air
-
Nitrogen
-
Oxygen
-
Industrial gases
Low-Viscosity Liquid Measurement
-
Water
-
Process liquids
-
Cooling systems
Industrial Industries
-
Petrochemical industry
-
Power plants
-
Metallurgy & steel manufacturing
-
Papermaking
-
Food processing
-
Water treatment
-
Battery production
Its compact design makes it especially suitable for skid-mounted systems, laboratory equipment, OEM machinery and pipeline sections with limited installation space.
-
Measuring principle
The FK-FVM200 operates based on the Kármán vortex street principle, derived from vortex formation theory proposed by Kármán and Strouhal.
When fluid flows through a triangular bluff body (vortex shedder) installed vertically inside the measuring tube, alternating vortices are generated on both sides of the bluff body. These vortices are shed periodically, forming a Kármán vortex street.
The vortex shedding frequency (F) is directly proportional to the fluid velocity (V). By detecting this frequency using a built-in sensor, the flow velocity can be calculated. Combined with the internal diameter of the meter, the volumetric and mass flow rate can be determined.
Calculation Formulas
Formula 1:
F = St × V / (m × d)
Formula 2:
Q = 3600 × F / K
Formula 3:
M = Q × ρ
Where:
-
F – Vortex shedding frequency (Hz)
-
St – Strouhal number (dimensionless)
-
V – Average flow velocity (m/s)
-
m – Ratio of arcuate flow area to pipe cross-sectional area
-
d – Width of triangular bluff body (m)
-
Q – Instantaneous volumetric flow rate (m³/h)
-
K – Meter coefficient (pulses per cubic meter)
-
M – Instantaneous mass flow rate (kg/h)
-
ρ – Fluid density (kg/m³)
Note: The meter coefficient K varies depending on meter diameter and is determined through actual calibration. It represents the number of pulses output per cubic meter of fluid under working conditions.
