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    3/8" Digital Flow Switch for Air

    High sensitive digital flow switch for air with 3/8 inch thread port size, measuring air and Nitrogen (N2), operating fluid temperature range from 0 to 50℃, selectable PNP or NPN signal output. This air flow switch comes with sensor for flow sensing to transmit data to the mainboard.
    SKU: ATO-FLOW-38
    30-day Returns
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    Delivery date: 6-12 days

    Factory price air flow switch with digital display can monitor data in real time. It is designed with high sensitive sensor, PNP or NPN signal output for transmitting data to the mainboard.


    Model ATO-NPF2A711-03 ATO-NPF2A721-03
    Port Size Rc (PT) 3/8 inch
    Measured Fluid Air, Nitrogen (N2)
    Rated Flow Range 10~100L/min 20~200L/min
    Minimum Set Unit 1L/min 2L/min
    Accumulated Pulse Flow Rate Exchange Value
    (Pulse Width: 50 ms)
    1L/pulse 2L/pulse
    Display Units Instantaneous Flow Rate L/min, CFMx10-1
    Accumulated flow L, ft3 x10-1
    Operating Pressure Range -50KPa~0.75KPa
    Operating Fluid Temperature 0~50℃
    Power Supply Voltage DC12~24V±10%
    Current Consumption 160mA or less
    Accumulated Flow Range 0~999999L
    Detection Type Heater type
    Accuracy ±5% F.S.
    Repeatability ±2% F.S.
    Temperature Characteristics ±3% F.S. (15 to 35°C, 25°C reference), ±5% F.S. (0 to 50°C, 25°C reference)
    Output Switch Output NPN open collector maximum load current: 80 mA
    Internal voltage drop: 1 V or less.
    Maximum applied voltage: 30 V, 2 outputs
    Accumulated Pulse Output NPN or PNP open collector (same as switch output)
    Hysteresis Hysteresis mode: Variable (can be set from 0)
    Window comparator mode: 3-digit fixed
    Response Time Lights up when output is turned ON
    OUT1: Green
    OUT2: Red
    Status LED’s 1 sec. or less
    Environment Enclosure IP65
    Operating Temperature Range Operating: 0 to 50°C
    Stored: –25 to 85°C (with no freezing and condensation)
    Withstand Voltage 1000 VAC for 1 minute between terminals and housing
    Insulation Resistance 50 mΩ or more (500 VDC measured via megohmmeter) between terminals and housing
    Noise Resistance 1000V P-P Pulse width 1μ s, duration 1 ns
    Wire Size M12 connector (3m)
    Weight 1kg

    Flow Rate Diagram

    Voltage Output: A: 1V, B 5V
    Current Output: A: 4mA, B 20mA

    Flow rate diagram of digital flow switch

    Pin Number & Wire Color

    Wire color of digital flow switch

    Pin Number Content Wire Color
    1 DC (+) Brown
    2 OUT2 White
    3 DC (-) Blue
    4 OUT1 Black

    Dimensions (Unit: mm)

    Dimensions of digital flow switch


    Digital Flow Switch for Air Details

    Tips: What is an air flow switch used for?

    Air flow switches can be used in air filtration and supply systems, duct heating, exhaust ventilation, and more. Air flow switches are found in a wide variety of duct and HVAC systems, often using paddle operation to trigger a micro switch when the flow increases or decreases beyond a set rate or volume. In HVAC and ductwork, many air flow switches can also be used to perform operations such as air handling, fan monitoring, and filter monitoring.

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