Product Description
Brass Water Flow Switch Low Flow 1.5-3 L/min G1/4 G3/8 G1/2 G3/4 Thread Magnetic Reed Switch NO for Industrial Water Systems
Brass Water Flow Switch Low Flow 1.5-3 L/min G1/4 G3/8 G1/2 G3/4 Thread Magnetic Reed Switch NO for Industrial Water Systems1. NOTE
Default Parameters
Power Supply:
Passive switch design, no external power source required.
Signal Type:
Passive switch signal / Normally open
Switch Type:
Available in magnetic and spring-loaded types
Connection Types:
Dual male thread
Dual female thread
Male inlet / Female outlet
Female inlet / Male outlet
Specifications:
G1/4
Flow Rate: 1.5L/min
Temperature Resistance: -10°C to 70°CG3/8
Flow Rate: 1.5L/min
Temperature Resistance: -10°C to 70°CG1/2
Magnetic Type: Flow Rate: 1.5L/min, Temperature Resistance: -10°C to 70°C
Spring Type: Flow Rate: 1.8L/min, Temperature Resistance: -10°C to 120°CG3/4
Magnetic Type: Flow Rate: 2.5L/min, Temperature Resistance: -10°C to 70°C
Spring Type: Flow Rate: 3L/min, Temperature Resistance: -10°C to 120°C
Important Notice:
This flow switch features an internal reed switch with small contacts, which are not designed to drive electrical loads directly. It should only be used as a signal output device. If you plan to control contactors, motors, solenoid valves, water pumps, or alarms, an intermediate relay is required. Direct connection to a load will damage the switch.
Please ensure you select the correct connection type before placing your order. If you need help choosing the right configuration, feel free to contact us.
2.Electrical Specifications
Parameter | Specification |
Signal Type | Passive switch signal / Normally open |
Load Voltage | 0~250V, AC/DC compatible |
Load Current | Max 0.3A (≤24V); Max 50mA (≤220V) |
Service Life | 100,000 cycles (≤24V), varies with 220V usage |
Electrical Usage Notice
The internal reed switch has small contacts and cannot directly drive loads. It should only be used as a signal output. When controlling contactors, motors, solenoid valves, water pumps, or alarms, an intermediate relay must be used to prevent damage to the switch.
3.Basic Parameters
Size | G1/4 | G3/8 | G1/2 | G3/4 |
Startup Flow (L/min) | 1.5 | 1.5 | 2.5 (Magnetic) / 1.8 (Spring) | 3 (Magnetic) / 3 (Spring) |
Max Flow (L/min) | 18 L/0.2MPa | 18 L/0.2MPa | 20L/0.2MPa | 25L/0.2MPa |
Operating Temp. (°C) | -10~70°C | -10~70°C | Magnetic:-10~70°C Spring:-10~120°C | Magnetic:-10~70°C Spring:-10~120°C |
Working Pressure (MPa) | 0.03~1.6 | |||
Installation Direction | Any direction | |||
Signal Wire Spec. | UL1007#22 350mm |
Specifications & Models
Size | Dual Male Thread | Dual Female Thread | Male Inlet / Female Outlet | Female Inlet / Male Outlet |
G1/4 | SK-2020-CL | SK-2121-CL | SK-2021-CL | SK-2120-CL |
G3/8 | SK-3030-CL | SK-3131-CL | SK-3031-CL | SK-3130-CL |
G1/2 (Magnetic) | SK-4040-CL | SK-4141-CL | SK-4041-CL | SK-4140-CL |
G1/2 (Spring) | SK-4040-CT | SK-4141-CT | SK-4041-CT | SK-4140-CT |
G3/4 (Magnetic) | SK-6060-CL | SK-6161-CL | SK-6061-CL | SK-6160-CL |
G3/4(Spring) | SK-6060-CT | - | - | - |
4.Applications
Smart home water systems
Water heaters and solar water heating
Water pumps and industrial fluid control
Agricultural irrigation and greenhouse automation
HVAC and cooling systems









5.FAQs
Q1. Does this sensor require a power supply?
A1.No, it is a passive switch that does not require any external power.
Q2. Can this switch directly control a pump or solenoid valve?
A2.No, it must be used with an intermediate relay for such applications.
Q3. What are the installation requirements?
A3.It can be installed in any direction. Ensure proper sealing to prevent leaks.
About Prime Living
Prime Living is a Canadian online store offering a carefully selected range of quality products for home, automotive, tools, outdoor living, electronics and more.
We are committed to fast order processing, secure packaging and reliable tracked shipping to provide an excellent shopping experience.
Shipping policy
We carefully handle each order to ensure your package arrives quickly and safely. Please note that factors such as weather, postal traffic, or carrier performance may occasionally cause delays beyond our control.
We provide free shipping and dispatch all orders within 2 business days of payment, often sooner. All shipments are sent via international express air shipping, with a tracking number provided so you can follow your order every step of the way.
. Please provide a physical address, as we do not ship to P.O. Boxes.
Returns
Your satisfaction is important to us. Hexlight offers a 14-day Free return policy: if you are not fully satisfied with your purchase, you may request either a full refund or an exchange. All return shipping costs are fully covered by us.
Condition
Brand New
Shipping
This item is shipped directly from our supplier in China with tracking.