1
FLUEREX
(Karman vortex flow rate sensor for water)
WFK2
Series
Flow rate range: 0.4 to 5, 1.6 to 20, 4 to 50, 8 to 100, 20 to 250 L/min
Specifications
Descriptions
WFK2-005
WFK2-020
WFK2-050
WFK2-100
WFK2-250
Connection
Port size
Rc, G, NPT
3/8, 1/2, 3/4
1, 1 1/4, 1 1/2
Port material
Stainless steel: SUS304
W
orking conditions
Applicable fluid
Pure water, industrial water
Max. working pressure MPa
1.0
Proof pressure
MPa
1.5
Manual valve internal leakage mL/min
0
No manual valve settings
Manual valve allowable
back pressure
MPa
0.3
No manual valve settings
Ambient temperature °C
0 to 50 (85% RH or less, no condensation)
Fluid temperature
°C
1 to 95
Flow rate
Flow rate range
L/min
0.4 to 5
1.6 to 20
4 to 50
8 to 100
20 to 250
Repeatability (*1)
Analog accuracy: ±2.5%F.S. Display accuracy: ±2.5%F.S. ±1 digit (min. display unit)
Temperature characteristics (*1)
±5%F.S. (base temperature 25°C, 10 to 50°C)
Low flow cut
5% of F.S.
Integrating flow range
99,999 L or 99,999 m
3
(unit selectable), reset when the power is turned off.
Integrated pulse rate L/pulse
0.1, 0.5, 1
0.1, 0.5, 1, 10
0.5, 1, 10, 50
1, 10, 50, 100
10, 50, 100
Pressure loss
MPa
0.07 (at F.S.)
0.05 (at F.S.)
0.05 (at F.S.)
0.05 (at F.S.)
0.03 (at F.S.)
Response time (*2) sec
0.25, 0.5, 1, 5, 10 (Initial value 1)
Temperature
Measurable temperature range
°C
0 to 100
Accuracy
Less than 50: analog accuracy ±2, display accuracy ±2 ±1 digit (min. display unit 1)
50 to 100: analog accuracy ±3, display accuracy ±3 ±1 digit (min. display unit 1)
Output
Display
Two-screen LCD display, instantaneous flow rate: 3 digits, water temperature: 2 digits, integrating flow: 5 digits, with screen rotation
Analog output (*3)
Standard: 0 to 5 VDC/1 to 5 VDC, option: 4 to 20 mA DC, 0 to 10 VDC/1 to 10 VDC
Switch output
NPN or PNP transistor open collector output (can be switched from settings)
Max. load current
50 mA
Max. applied voltage
30 VDC
Internal voltage drop
2.0 V or less
Power supply voltage
Analog output standard: 12 to 24 VDC ±10%, analog output option: 24 VDC ±10%
Current consumption (*4)
50 mA or less
Mounting
Mounting orientation
Unrestricted in vertical/horizontal direction
Straight piping section
None
IN side: 10 D, OUT side: 5 D
Degree of protection
IP65 or equiv.
Weight
g
3/8 (Rc, G, NPT): approx. 320
1/2 (Rc, G, NPT): approx. 320
3/4 (Rc, G, NPT): approx. 400
1 (Rc, G, NPT): approx. 870
1 1/4 (Rc, G, NPT): approx. 1,010
1 1/2 (Rc, G, NPT): approx. 1,100
*1: Accuracy is the average value over 10 sec (for conditions not containing air bubbles). F.S. stands for full scale flow rate.
*2: The time to attain 70% of the original output after the normal flow rate (used) drops instantly to 0.
*3: Check the allowable load on the wiring method page.
*4: Current for when 24 VDC is connected, and no load is applied. The current consumption will vary depending on how the load is connected.