Measuring principle
When a columnar object 'd' is placed in the flow path of a fluid, regular channels of vortices (called Karman vortex channels) are generated alternately in the wake of the object.
Since the frequency 'f' of a vortex generated is linearly proportional to the flow velocity 'V' within a wide range of Reynolds numbers without being affected by temperature, pressure etc.
The flow amount can be measured by counting the number of vortices.

Model

LK-P

LK

LK-S

Type

10A, 15A, 20A, 25A

Fitting

FINAL LOCK or tube fitting

R 1/2 (only 10A) or  union fitting

Measurable Flow Range

10A

2.5 l/min ~ 20 l/min

4 l/min ~ 25 l/min

15A

4 l/min ~ 40 l/min

8 l/min ~ 50 l/min

20A

10 l/min ~ 90 l/min

12 l/min ~ 80 l/min

25A

--------------------

20 l/min ~ 130 l/min

Max Measurable Viscosity

10A

1.5mm²/sec

2mm²/sec

15A

2.5mm²/sec

3mm²/sec

20A

4mm²/sec

4mm²/sec

25A

--------------------

5.5mm²/sec

Accuracy

within ±2%FS

within ±2%FS

within ±3%FS

Max Working Pressure

10A

1MPa

1MPa

15A

0.6MPa

20A

0.5MPa

Wetted Material

PFA

Linear PPS

Liquid Temperature

0~90°C

Ambient Temperature

0~50°C

0~0°C

-10~70°C

Preservation Temperature

-10~60°C

-20~70°C

Power Supply

DC 12~24V ±10%

DC 3V (AAA battery x 2 pcs)

DC 17~25 V

max load resistance 50 W (at 17V)

Display Part

*1

*2

N/A

Output Signal

Flow rate : 4~20mA

alarm : open connector

N/A

Flow rate : 4~20mA

Sampling Time

3 sec

Installation

Can be mounted in any position provided that the LED display is adjusted correctly