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    Picture of 1/2" Digital Water Flow Switch, 2-16L/min, NPN/ PNP Picture of 1/2" Digital Water Flow Switch, 2-16L/min, NPN/ PNP Picture of 1/2" Digital Water Flow Switch, 2-16L/min, NPN/ PNP Picture of 1/2" Digital Water Flow Switch, 2-16L/min, NPN/ PNP

    1/2" Digital Water Flow Switch, 2-16L/min, NPN/ PNP

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    SKU: SUCH-FLS-NPF3W72004
    $307.99
    ● 1/2 inch connection diameter ● 2-16 L/min rated flow range ● NPN/ PNP/ 4-20mA/1~5V ● Karman vortex street type
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    🕒 Delivery date: 6-12 days
    🔁 30-day Returns
    Overview

    Professional digital water flow switches for precise flow control. With an accuracy of ±3% F.S., these flow switches are suitable for low-viscosity media such as water and ethylene glycol solutions. They support a wide flow range of 1.7–22 L/min and fine adjustment in 0.1 L/min increments to meet precision control requirements. The switch supports multiple output modes, including NPN/PNP, 4–20mA, and 1–5V, offering strong compatibility and making it widely applicable in industrial automation, cooling systems, and water treatment equipment. 

    Feature

    1-2 inch digital air flow switch feature

    • SUCH 1/2 inch digital water flow switch is specifically designed for medium-flow systems, with a rated flow range of 2–16 L/min, meeting monitoring requirements for larger water flows.
    • The water flow switch also features hysteresis control mode, upper/lower limit comparison mode, and cumulative output mode, making it essential for automated production lines and equipment protection systems.
    • With an IP65 protection rating, it effectively prevents dust and moisture ingress. Certified to CE, UL, and RoHS standards, it is suitable for diverse applications including industrial equipment, HVAC systems, and circulating water monitoring.

    Dimension (unit: mm)

    Body Dimension

    Digital water flow switch dimension

    Basic Dimensions A AA B D E F G H
    78 54 30 60 40.6 15.2 27 18
    J K L N P / / /
    39 30 18 13.6 Ø2.7 deep 12 / / /
    Bracket Dimensions S T U V W WX Y Z
    28 22 32 40 50 4.5 5 1.5


    M8 Lead Wire Dimension

    Digital water flow switch lead wire dimension

    Detail

    Digital water flow switch details

    1. Function Panel: Enables switching between functions and rapid application response.
    2. Water Sensor: Specifically designed to detect water flow and transmit data to the main board.
    3. Main Board: Stores memory data, records data, and provides real-time display.

    Pin Number & Wire Color

    Digital water flow switch wire color

    Pin Number Content Wire Colors
    1 DC (+) Brown
    2 OUT 2 White
    3 DC (-) Blue
    4 OUT 1 Black


    Flow Rate Diagram

    Digital water flow switch flow rate diagram

    Output Type A B C
    Voltage Output 1 V 1.5 V 5 V
    Current Output 4 mA 6 mA 20 mA
    Specs
    Connection Diameter Rc(PT) 1/2 inch
    Measured Fluid Water and ethylene glycol water solutions (viscosity ≤3 mPa·s / 3 cP)
    Detection Method Karman vortex street type
    Rated Flow Range 2–16 L/min
    Display Flow Range 1.7–22.0 L/min
    Set Flow Range 1.7–22.0 L/min
    Minimum Setting Unit 0.1 L/min
    Cumulative Pulse Conversion Value 0.1 L/pulse
    Operating Fluid Temperature 0–90°C (non-condensing)
    Display Unit Instantaneous flow L/min, cumulative flow L
    Accuracy Display value ±3% F.S., analog output ±3% F.S.
    Repeatability ±2% F.S.
    Temperature Characteristics ±5% F.S. (at 25°C reference)
    Operating Pressure Range 0–1 MPa
    Pressure Loss 45 kPa at max. flow (without flow control valve)
    Cumulative Flow Range 99999999.9 L / per 0.5 L
    Output Type NPN or PNP open-collector output
    Voltage Output 1–5 V (output impedance 1 kΩ)
    Current Output 4–20 mA
    Maximum Load Current 80 mA
    Maximum Applied Voltage DC 28 V
    Internal Voltage Drop NPN: ≤1 V (80 mA load) / PNP: ≤1.5 V (80mA load)
    Response Time 0.5s / 1s / 2s
    Output Protection Short-circuit protection
    Output Mode Hysteresis mode, upper/lower limit comparison mode, cumulative output mode, cumulative pulse output mode
    Load Impedance DC12V: 300Ω
    DC24V: 600Ω
    Hysteresis Adjustable
    External Input No voltage input: ≤0.4V (with or without contact), input ≥30ms
    Display Method Dual-sided display
    Display Screen 4-digit 7-segment 2-color LED
    Operation Indicator Output 1 / Output 2: Orange
    Power Supply Voltage DC12–24V ±10%
    Current Consumption ≤50mA
    Protection Rating IP65
    Operating Temperature Range 0–50°C (non-condensing)
    Operating Humidity Range 35–85%RH (non-condensing)
    Withstand Voltage AC1000V 1 minute
    Insulation Resistance ≥50MΩ (DC500V)
    Wetted Parts Material PPS / SUS304 / FKM / SCS13
    Standards and Regulations CE, UL(CSA), RoHS
    Lubrication Grease-free specification
    Weight 1kg
    Application

    Central air conditioning system

    Central Air Conditioning System

    Digital water flow switch for boiler equipment

    Boiler Equipment

    Water purification equipment

    Water Purification Equipment

    FAQ
    ❯

    Standard water flow switches primarily detect the presence of water flow, typically providing only a switch signal output. Digital water flow switches add a digital display function to this capability. Users can not only determine if the device has triggered but also view flow data or set values on the screen. This visual information facilitates more precise system parameter adjustments and rapid issue identification during malfunctions.

    ❯

    When installing a digital water flow switch, align the device's arrow indicator with the water flow direction and ensure no significant debris is present inside the pipe. Installation is typically recommended on a straight pipe section to minimize interference from elbows or valves on flow measurement. Pay attention to sealing integrity during installation to prevent leaks and ensure correct wiring between the sensor and control system.

    ❯

    Select the flow range based on actual pipeline flow conditions. For equipment operating at low flow rates, choose a model with a low start-up flow to ensure timely detection of flow changes. For higher flow rates, select a model with a larger measurement range to prevent exceeding the measurement capacity.

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