3/8" Digital Air Flow Switch, NPN/ PNP 2 Output

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SKU: SUCH-FLS-NPF2A711

$234.99

● 3/8 inch connection diameter ● 10–100 L/min, 20–200 L/min ● NPN/ PNP 2 Output ● Air, N₂ operating fluid

Rated Flow Range *
Output Signal *

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🕒 Delivery date: 6-12 days

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Overview
Specs
Application
FAQ
Reviews

Overview

The high-performance 3/8" digital air flow switch is suitable for common gas media such as air and nitrogen. Utilizing advanced thermal detection technology, it achieves precise flow measurement from 10–100 L/min or 20–200 L/min. A clear digital display provides real-time readings of instantaneous and cumulative flow data, enabling quick monitoring and data retrieval. The flow switch supports multiple display units, including L/min and CFM, incorporates cumulative flow statistics, and features a 3/8-inch Rc(PT) connection with NPN/PNP 2 outputs. Its user-friendly installation and operation meet long-term monitoring requirements in industrial production.

Feature

Digital air flow switch feature

The digital air flow switch is suitable for common gases such as air and nitrogen, ensuring stable operation in pneumatic systems, automated equipment, and industrial gas control systems.
Employing thermal flow detection principles, it features fast response times and high measurement stability, maintaining excellent detection accuracy under varying flow conditions.
The SUCH digital airflow switch offers rated flow ranges of 10–100 L/min or 20–200 L/min, meeting gas-flow monitoring requirements for small pneumatic equipment and automated production lines.
Equipped with a digital display, it shows real-time instantaneous and cumulative flow data in both L/min and CFM units, facilitating on-site monitoring and data analysis by operators.
Two built-in NPN open-collector outputs allow configurable upper/lower limit flow alarms or control signals, enabling direct integration with PLCs or controllers in automated systems.

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

Model	SUCH-NPF2A711-03	SUCH-NPF2A721-03
Connection Diameter Rc(PT)	3/8 inch	3/8 inch
Operating Fluid	Air, N₂
Rated Flow Range	10–100 L/min	20-200 L/min
Minimum Setting Unit	1 L/min	2 L/min
Cumulative Pulse Flow Conversion Value	1 L/pulse	2 L/pulse
Display Unit	Instantaneous flow: L/min, CFM ×10⁻¹
	Cumulative flow: L, ft³ ×10⁻¹
Operating Pressure Range	-50 kPa to 0.75 MPa
Operating Fluid Temperature	0 to 50°C
Power Supply Voltage	DC 24V ±10%
Current Consumption	≤160 mA (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)
	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
	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: What is the primary function of a digital air flow switch? ❯

Digital air flow switches are primarily used to detect changes in air flow within pipelines or equipment, providing real-time feedback on flow status via digital displays. When flow reaches a preset value, the switch outputs a signal to control equipment startup, shutdown, or alarm activation.

Q2: What are the typical applications for a digital air flow switch? ❯

Digital air flow switches are widely used in industrial automation, HVAC systems, cleanroom ventilation systems, pneumatic equipment control, and air filtration system monitoring.

Q3: How should a digital air flow switch be properly installed? ❯

When installing a digital air flow switch, ensure the airflow direction aligns with the device's marked orientation. Position it in a section of the duct where airflow is stable, avoiding locations near elbows, valves, or fan outlets to minimize turbulence that could affect measurement accuracy. Additionally, select an installation location that allows easy viewing of the display and facilitates maintenance. Connect the power supply and control circuits according to the manual to ensure stable operation.

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3/8" Digital Air Flow Switch, NPN/ PNP 2 Output

Feature

Dimension (unit: mm)

Detail

Pin Number & Wire Color

Flow Rate Diagram

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