1/2" Digital Air Flow Switch, NPN/ PNP 2 Output

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SKU: SUCH-FLS-NPF2A751

$231.79

● 1/2 inch ● 50~500 L/min ● NPN/ PNP 2 Output ● Air, N₂ operating fluid

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🕒 Delivery date: 6-12 days

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Overview
Specs
Application
FAQ
Reviews

Overview

The SUCH 1/2-inch digital air flow switch is designed for industrial applications requiring precise flow monitoring, enabling real-time detection and control of air and N₂ gas flow rates. With a rated flow range of 50-500 L/min, its clear digital display shows instantaneous flow in real time. Powered by DC24V, the flow switch features low power consumption and rapid response with a response time under 1 second. Its NPN/PNP output supports 2 output signals, enabling integration into automated control systems or equipment interlocking.

Feature

1-2 inch digital air flow switch feature

The SUCH air flow switch features a 1/2-inch connection design with a rated flow range of 50–500 L/min, making it suitable for larger airflow systems such as industrial pneumatic equipment and compressed air pipelines.
The air flow switch's min setting increment of 5 L/min enables precise flow control, allowing flexible adjustment to meet varying equipment operational requirements.
The display not only shows instantaneous flow but also records cumulative flow data, with a cumulative range up to 999,999 L, facilitating long-term flow statistics and management.
Equipped with two switch output ports, each can be set as an alarm point or control point, enabling automatic control and safety protection for pneumatic systems.
With an IP65-rated protective structure and M12 industrial connectors, it offers easy installation and secure connections, making it suitable for automated production lines and equipment integration applications.

Dimension (unit: mm)

Digital air flow switch dimension

Detail

Digital air flow switch details

Function Board: Used for flow control adjustment, precise flow setting, and output regulation.
Threaded Air Inlet: Manufactured from aluminum alloy with a sandblasted surface finish, featuring precision threads for secure pipe connections.
Main Circuit Board: Used for flow display and statistical storage of flow data.
High-Sensitivity Sensors: Accurately transmit data to the mainboard for real-time display.

Pin Number & Wire Color

Digital air 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
Voltage Output	1 V	5 V
Current Output	4 mA	20 mA

Specs

Connection Diameter Rc(PT)	1/2 inch
Operating Fluid	Air, N₂
Rated Flow Range	50-500 L/min
Min Setting Unit	5 L/min
Cumulative Pulse Flow Conversion Value	5 L/pulse
Display Unit	Instantaneous flow: L/min, CFM ×10⁻¹
Display Unit	Cumulative flow: L, ft³ ×10⁻¹
Operating Pressure Range	-50 kPa ~ 0.75 MPa
Operating Fluid Temperature	0 ~ 50°C
Power Supply Voltage	DC 24V ±10%
Current Consumption	≤170mA (No Load)
Cumulative Flow Range	0 ~ 999999 L
Detection Method	Thermal
Accuracy	±5% of full scale
Repeatability	±2% of full scale
Temperature Characteristics	±3% of full scale (15~35°C), ±5% of full scale (0~50°C) (25°C reference)
Switch Output	NPN open-collector, max load current 80mA, internal voltage drop ≤1V, max applied voltage 30V, 2 outputs
Cumulative Pulse Output	NPN open-collector (same as switch output)
Hysteresis	Hysteresis mode: Variable (set from 0)
Hysteresis	Upper/lower limit comparison mode: Fixed (3 digits)
Response Time	<1s
Operation Indicator Light	ON: LED lit
	OUT1: Green
	OUT2: Red
Protection Rating	IP65
Operating Temperature Range	Operating: 0~50°C
Operating Temperature Range	Storage: -25~85°C (non-condensing)
Withstand Voltage	External terminals to housing: AC1000V 1 minute
Insulation Resistance	External terminals to housing: ≥50MΩ
Noise Immunity	1000V P-P pulse width 1µs, interval 1ns
Wire Specifications	M12 connector (3m)

Application

Machine Tool

Automotive Component

Lithium Battery

FAQ

Q1: How does a digital air flow switch operate? ❯

Digital air flow switches typically sense air movement through built-in flow detection elements or anemometers. As air passes through the sensor, it generates corresponding signal changes. Internal circuitry converts these into digital signals displayed on the screen. When the detected flow reaches or exceeds the preset threshold, the device triggers the switch output to enable automatic control or alarm functions.

Q2: How to set the flow rate on a digital air flow switch? ❯

Most digital air flow switches feature button controls or menu interfaces to configure target flow thresholds via the control panel. Users can set start-up or alarm flow rates based on system requirements. When real-time flow reaches the preset value, the device automatically outputs control signals. After configuration, conduct actual flow testing to verify the setpoint aligns with system operating conditions.

Q3: Does the digital air flow switch require regular maintenance? ❯

To ensure measurement accuracy and long-term stable operation, regular inspections of the digital air flow switch are recommended. Maintenance tasks primarily include cleaning the sensor probe, checking electrical connections for tightness, verifying display readings are normal, and calibrating flow parameters.

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1/2" Digital Air Flow Switch, NPN/ PNP 2 Output

Feature

Dimension (unit: mm)

Detail

Pin Number & Wire Color

Flow Rate Diagram

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Automotive Component

Lithium Battery

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