VNCompact Electromagnetic Flow Sensor

VN Photo


This flow sensor is a compact version of our electromagnetic flow meters that has been designed to be easily built into equipment. It also has realized cost saving. It provides stable measurement and repeatability.

* We are happy to provide sample or evaluation products for customers who need to build the sensors into their equipments.


・Compact design, no straight piping is required for either side of the piping! Greater freedom in installation locations.

・Equipped with two outputs, this sensor broadens the choice of output, such as flow rate, switch judgment and self-diagnosis.

・Having no moving parts makes free of damage resulting from foreign substances.

Standard Specifications

Model VN05 VN10 VN20
Accuracy Guaranteed Flow Rate Range
(Minimum flow rate – maximum flow rate)
0.05 – 1 L/min 0.5 – 10 L/min 3.0 – 60 L/min
Maximum operating flow 3 L/min 25 L/min 100 L/min
Low flow cut-off 0.025 L/min 0.25 L/min 1.5 L/min
(at fluid temperature of 25°C)
Frequency pulse ± 2.5 RS% (100% to 20% of maximum flow rate)
± 0.5 FS% (20% to 5% of maximum flow rate)
Unit pulse ± 2.0 RS% (100% to 20% of maximum flow rate)
± 0.4 FS% (20% to 5% of maximum flow rate)
Piping connection (Screw size) R1/2 R1/2 R1
Fluid temperature range 0 to 60℃(Non-freezing)
Fluid conductivity range 50 µS/cm or higher
Target liquids Conductive liquid that does not corrode the material exposed to it.
Operating pressure 1 MPa or less
Pressure loss 0.02 MPa or less
Ambient temperature and humidity Temperature: -20°C to 60°C
Humidity: 35% to 85% RH (Non-condensing)
Responsiveness 63% response Damping time: 2 s (Standard)
Signal cables Length: 0.5 m, 4-wire
Red: Power + line
White: Output 1
Blue: Power – line (GND)
Yellow: Output 2
LED displays One LED display on the sensor body
Green: Indicates flow rate with three scales of blinking speed.
Red: Indicates abnormal state with the number of blinks.
Installation position Free (Vertical piping is recommended.)
Output common specifications NPN open collector
Current capacity: 20: mA or less
Voltage: 30 VDC or less
Residual voltage when ON: 1 V or less
Output 1*2 Frequency pulse*1 Duty ratio Standard 200 Hz
(Can be configured by 0.1 Hz in the range between 20 and 400 Hz.)
Unit pulse 0.001 L/P (Standard) 0.01 L/P (Standard) 0.1 L/P (Standard)
Alarm*3 Can be selected from normal open (Standard) or normal close.
Alarm contents (Power supply and voltage drops/ meter failure/ empty fluid/
excessive flow rate/ excessive flow noise/ reverse flow)
Switch*4 Can be selected from normal open (Standard) or normal close.
Level judgment value: Can be configured by 1% in the range of 0 – 100%.
(The maximum flow rate is converted to 100%.)
Output 2 *2 Unit pulse Same as output 1.
Alarm*3 Same as output 1.
Switch*4 Same as output 1.
Safety Class IP X4(IP 64 compatible)
Current Consumption 100mA or less
Power Source Supply isolated power at 12 -24 VDC (±10%).
Use of one unit of power supply is recommended for one unit of VN.
Exposed materials to fluids Body: PPS resin
Electrodes: SUS 316 L
O ring: FKM
Grounding ring: SUS 316

* 1: The frequency at maximum flow rate
* 2: The set value of Output 1 and 2 and options are the factory-default settings. The set value cannot be changed after installation.
* 3: The alarm can only be selected for either Output 1 or 2.
* 4: The window judgment uses Output 1 and 2.
(Note) Not complied with the lightning surge protection in CE.




Model VN05 VN10 VN20
L 85 95 110
W 47 47 49
H 49 52 62
φ D 5.2 10 20
R 1/4 1/2 1

Other information

Wiring Diagram

Wiring method of supplied cords
・We recommend the pull-up resistance of open-collector Output 1 and 2 to be 10 to 20K Ω.
・If you use the product out of the recommended range, make sure the sink current (Is) is within 20 mA.




Compatible display unit


Compatible with compact electromagnetic flow sensors VN/VNS
Display Unit ASI-100
The versatile analog output allows you to apply it for a variety of uses such as controlling and recording flow rate.