Digital Flow Switch for Water Size 3/4″ with digital display for real-time monitoring, ±2% accuracy, measuring water and ethylene glycol aqueous solution, fluid temperature 0~90?. This water flow switch comes with a water sensor, which is designed for flow sensing to transmit data to the mainboard, Selectable signal output PNP or NPN.
Overview Digital Flow Switch for Water Size 3/4″
A lightweight water flow switch with a digital display can monitor data in real-time. It is designed with a water sensor, PNP, or NPN signal output for transmitting data to the mainboard.

What are the functions of water flow switches?
- Detect whether the liquid in the pipeline flows and whether the flow meets the requirements, and at the same time, the on-off state of a signal is provided by the switch electrical contact.
- The equipment system judges the working status of the pipeline system by detecting whether there is a signal or control current passing through this switch, and gives the corresponding control or operation mode or measures.
- It is used to detect the flow of liquid in the water circulation pipe network system of the central air conditioner, the automatic sprinkler fire extinguishing system of the fire protection system, and a certain type of liquid circulation cooling system pipeline.
The Specifications of Digital Flow Switch for Water Size 3/4″
Model | ATO-NPF3W74006 | |
Port Size Rc (PT) | 3/4 inch | |
Applicable Fluid | Water, Ethylene glycol aqueous solution (with viscosity of 3 MPa·s [3 cP] or less) | |
Detection Method | Karman vortex | |
Rated Flow Range | 5~40L/min | |
Display Flow Range | 3.5~55.0L/min | |
Set Flow Range | 3.5~55.0L/min | |
Smallest Settable Increment | 0.1L/min | |
Conversion of Accumulated Pulse | 0.05L/pulse | |
Fluid Temperature | 0 to 90°C (No freezing or condensation) | |
Display Unit | Instantaneous flow: L/min, Accumulated Flow: L | |
Accuracy | Display value: ±3% F.S. Analog output: ±3% F.S. | |
Repeatability | ±2% F.S | |
Temperature Characteristics | ±5% F.S. (25°C standard) | |
Operating Pressure Range | 0~1MPa | |
Proof Pressure | 45kPa or less at the maximum flow | |
Accumulated Flow Range | 99999999.9L | |
By 1L | ||
Switch Output | / | NPN or PNP |
Max. Load Current | 80mA | |
Max. Applied Voltage | DC28V | |
Internal Voltage Drop | NPN: 1 V or less (at load current of 80 mA) PNP: 1.5 V or less (at load current of 80 mA) | |
Response Time | 0.5s/ 1s/ 2s | |
Output Protection | Short-circuit protection | |
Analog Output | Voltage Output | Voltage output: 1 to 5 V Output impedance: 1 k? |
Current Output | Output current: 4 to 20 mA Max. load impedance: 300 ? for 12 VDC, 600 ? for 24 VDC | |
Response Time | 0.5s/ 1s/ 2s (linked with the switch output) | |
Hysteresis | Variable | |
External Input | Voltage free input: 0.4 V or less (Reed or Solid state), input for 30ms or longer | |
Display Method | 2-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 Light | Output 1, Output 2: Orange | |
Power Supply Voltage | DC12~24V±10% | |
Current Consumption | Below 50mA | |
Environment | Enclosure | IP65 |
Operating Temperature Range | 0 to 50°C (No freezing or condensation) | |
Operating Humidity Range | Operation, storage: 35 to 85% R.H. (No condensation) | |
Withstand Voltage | 1000 VAC for 1 minute between terminals and housing | |
Insulation Resistance | 50 M? or more (500 VDC measured via megohmmeter) between terminals and housing | |
Standards and Regulations | CE, UL(CSA), RoHS | |
Wetted Parts Material | PPS. SUS304. FKM. SCS13, Non-grease | |
Weight | 1kg |
Flow Rate Diagram
- Voltage Output: A: 1V, B: 1.5V, C: 5V
- Current Output: A: 4mA, B: 6mA, C: 20mA

Pin Number & Wire Color

Pin Number | Content | Wire Color |
1 | DC (+) | Brown |
2 | OUT2 | White |
3 | DC (-) | Blue |
4 | OUT1 | Black |
Body Dimensions (Unit: mm)

Basic Dimension
A | AA | B | D | E | F | G | H | J | K | L | N | P |
98 | 71 | 38 | 68 | 48.6 | 19.2 | 32 | 28 | 49 | 35 | 28 | 16.8 | ?2.7 deep 12 |
Bracket Dimension
S | T | U | V | W | WX | Y | Z |
34 | 30 | 42 | 48 | 58 | 4.5 | 5 | 1.5 |
M8 Lead Wire Dimensions (Unit: mm)

Details

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