Float Type Liquid Level Switch NK004 series

Brand：NOIKE-AH
Model：NK004

Specification

Liquid Level Switch NK004

Product Overview

The Float Type Liquid Level Switch NK004 Series uses a magnetic float and reed switch structure to provide reliable point level detection for liquids.

A dry reed switch is installed inside a sealed non-magnetic stainless steel tube, while a circular magnetic ring is integrated into the float. As the liquid level rises or falls, the float moves accordingly, causing the magnetic ring to activate or release the reed switch inside the tube and generate a switching signal.

The NK004 supports both top-mounted and bottom-mounted installation. Its compact structure, reliable performance, good repeatability, long service life, and high-temperature resistance make it suitable for various liquid level monitoring applications.

Working Principle

The NK004 Liquid Level Switch NK004 operates using a magnetic float and reed switch principle.

The float contains a permanent magnetic ring that moves with changes in liquid level. When the float reaches the switching position, the magnetic field activates the reed switch sealed inside the stainless steel tube. As the liquid level changes, the reed switch opens or closes, providing a reliable switching signal for liquid level monitoring and control.

Product Features

Magnetic float and reed switch operating principle
Compact and robust construction
Reliable switching performance
Good repeatability
Long service life
High-temperature resistance
Supports top or bottom installation
Normally Open (NO), Normally Closed (NC), or NO+NC output options

Wiring Diagram

Size chart

Product Applications

Applicable Medium

Water and oil

According to the product specifications, the NK004 is suitable for:

Liquid level measurement
Liquids with a density of ≥ 0.75 g/cm³

Technical Specifications

Measurement Specifications

Parameter	Specification
Applicable Medium Density	≥ 0.75 g/cm³
Maximum Pressure	5 bar
Medium Temperature	-10°C to 130°C

Electrical Specifications

Parameter	Specification
Output	Normally Open (NO), Normally Closed (NC), or NO + NC
Contact Type	Reed Switch
Contact Rating	250 VAC, 5 A

Mechanical Specifications

Parameter	Specification
Protection Rating	IP65
Wiring Method	Direct cable connection, optional connectors
Material Options	Brass / POM Engineering Plastic / Stainless Steel

Frequently Asked Questions (FAQ)

How does the Liquid Level Switch NK004 work?

The NK004 uses a magnetic float that moves with the liquid level. The magnetic field activates or releases a reed switch inside the stainless steel tube to generate a switching signal.

What liquids can the NK004 be used with?

According to the specifications, it is suitable for liquids with a density of 0.75 g/cm³ or higher.

What installation methods are available?

The NK004 can be installed from either the top or the bottom of the tank, depending on the application.

What output options are available?

The switch is available with:

Normally Open (NO)
Normally Closed (NC)
Normally Open + Normally Closed (NO+NC)

What materials are available?

The product is available in:

Brass
POM Engineering Plastic
Stainless Steel

Why Choose the Float Type Liquid Level Switch NK004 ?

The NK004 Series Float Type Liquid Level Switch is designed for simple and reliable point level detection in liquid applications.

Reasons to choose the NK004 include:

Magnetic reed switch design for dependable switching.
Top or bottom installation options for flexible mounting.
Multiple output configurations including NO, NC, and NO+NC.
Compact structure suitable for space-limited installations.
Good repeatability for consistent switching performance.
Available in brass, engineering plastic, or stainless steel to meet different installation requirements.

Typical Application Case

Reliable Liquid Level Monitoring for Industrial Water Tanks

In industrial water supply and equipment cooling systems, maintaining a stable liquid level is essential to ensure continuous operation. A float-type liquid level switch is commonly used to monitor high or low liquid levels and provide a switching signal for pumps or control systems.

The Liquid Level Switch NK004 uses a magnetic float and reed switch mechanism to detect changes in liquid level. As the liquid rises or falls, the float moves accordingly and activates the internal reed switch to output a control signal. Depending on the installation requirements, the switch can be mounted from the top or bottom of the tank. With multiple material options and selectable NO/NC output configurations, the NK004 can be integrated into various liquid level monitoring systems where the measured liquid has a density of 0.75 g/cm³ or higher.