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Home / Products / Digital Flow Sensor / Digital Flow Sensor NPF3W7 Series

Digital Flow Sensor NPF3W7 Series

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  • NPF3W7

  • NNT

NPF3W7 Digital Flow Sensor

Applicable fluidWater and Ethylene glycol aqueous solution (with viscosity of 3 mPa·s [3 cP] or less)
Detection methodKarman vortex
Rated flow range0.5~4L/min2-16L/min5-40L/min10~100L/min50~250L/min
Display flow range0.35~5.5L/min1.7~22.0L/min3.5~55.0L/min7~140L/min20~350L/min
Set flow range0.35~5.50L/min1.7~22.0L/min3.5~55.0L/min7~140L/min20~350L/min
Smallest settable increment0.01L/min0.1L/min1L/Mmin2L/min
Conversion of accumulated pulse0.05L/pulse0.1L/pulse0.5L/pulse1L/pulse2L/pulse
Fluid temperature0 to 90°C (No freezing or condensation)
Display unitInstantaneous flow: L/min, Accumulated flow: L
AccuracyDisplay value: ±3% F.S. Analog output: ±3% F.S.
Repeatability±2% F.S
Temperature characteristics±5%F.S. (25°C standard)
Operating pressure rangeO-1MPa
Proof pressure45 kPa or less at the maximum flow60 kPa or less at the maximum flow
Accumulated flow range*499999999.9L999999999L
By 0.1LBy 0.5LBy 1L
NPN or PNP open collector output
Max. load current80mA
Max. applied voltageDC28V
Internal voltage dropNPN: 1 V or less (at load current of 80 mA) PNP: 1.5 V or less (at load current of 80 mA)
Response time0.5s/1s/2s
Output protectionShort-circuit protection
Flow rateSelect from Hysteresis, Window comparator, Accumulated output, or Accumulated pulse output modes.
TemperatureSelect from Hysteresis mode or Window comparator mode.

Response time0.5 s/1 s/2 s (linked with the switch output)
Voltage outputVoltage output: 1 to 5 V Output impedance: 1 kΩ
Current outputOutput current: 4 to 20 mA Max. load impedance: 300 Ω for 12 VDC, 600 Ω for 24 VDC
External inputVoltage free input: 0.4 V or less (Reed or Solid state), input for 30 ms or longer
Display method2-screen display (Main screen: 4-digit, 7-segment, 2-color, Red/Green Sub screen: 6-digit, 11-segment, White) Display values updated 5 times per second
Indicator lightOutput 1, Output 2: Orange
Power supply voltageDC12~24V±10%
Current consumption50mAunder
Operating temperature range0 to 50°C (No freezing or condensation)
Op erating humidity ranOperation, Storage: 35 to 85% R.H. (No condensation)
Withstand voltage *41000 VAC for 1 minute between terminals and housing
Insulation resistance50 MΩ or more (500 VDC measured via megohmmeter) between terminals and housing
Standards and regulationsCE
Wetted parts materialPPS, SUS304. FKM. SCS316
Piping port size 63/81/23/4111/2

Flow Sensor Core Part

Digital Flow Sensor Valve NPF3W7

Flow Sensor Flow Sensor

Water sensor

Specially used for water flow sensing to transfer data to the main board

Flow Sensor Circuit Board

Main board

Store memory data, record data, real-time display

Flow Sensor Function Board

Function board

Achieve the switch between functions and applications of rapid response

Flow Sensor Order Model Type

Flow Sensor NPF3W

NNT Strength

Manufacture Department

Production Line

Electric Manufacture Department

Testing Center




Vortex frequency: V: flow velocity; K: proportional constant (depending on the size and state of the vortex generator) and then the fluid frequency is detected.

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