Product Overview

The NOIKE-AH Thermal Dispersion Flow Switch NK600 Series is an intelligent electronic flow switch designed for reliable liquid flow monitoring in demanding industrial applications. Utilizing advanced thermal dispersion technology, it continuously detects the flow velocity of water, oil, and other compatible liquids without any moving mechanical parts.

Constructed with a rugged 304 stainless steel probe and a durable PUR housing, the NK600 delivers outstanding reliability, excellent corrosion resistance, and virtually maintenance-free operation. Its integrated LED flow indication allows operators to monitor flow conditions instantly, making it an ideal solution for pump protection, cooling systems, lubrication circuits, and process automation.

Working Principle

The Thermal Dispersion Flow Switch NK600 Series operates using the thermal dispersion principle.

Inside the sensing probe are two temperature sensors:

• One sensor continuously measures the medium temperature.
• The second sensor is heated to maintain a constant temperature difference.

When fluid begins flowing, it carries heat away from the heated sensor. The higher the flow velocity, the greater the cooling effect and the smaller the temperature difference between the two sensors.

The internal microprocessor continuously analyzes this temperature variation and converts it into a precise flow signal, activating the selected switch or analog output when the preset flow threshold is reached.

Because there are no moving parts, the sensor provides excellent long-term stability, high reliability, and minimal maintenance requirements.

Key Features

• Thermal dispersion measurement technology
• No moving mechanical parts
• Maintenance-free operation
• Suitable for water, oil and compatible liquids
• High-pressure resistance up to 100 bar
• Durable 304 stainless steel sensing probe
• Ruged PUR industrial housing
• LED flow status indication
• Adjustable switching point
• Fast response time
• Reverse polarity, overload and short-circuit protection
• Available with PNP, NPN or Relay outputs
• Compact design for easy installation
• Long service life with excellent repeatability

Technical Specifications

Typical Applications

The Thermal Dispersion Flow Switch NK600 Series is widely used in industrial fluid monitoring and pump protection applications, including:

• Cooling water systems
• Industrial circulating water
• Hydraulic systems
• Lubrication systems
• Machine tool coolant monitoring
• Pump dry-run protection
• Water treatment equipment
• Chemical processing
• Food and beverage machinery
• HVAC systems
• Steel and metallurgy
• Paper manufacturing
• Power plants
• General industrial automation

Product Advantages

Maintenance-Free Design

Without paddles, springs or moving mechanical components, the NK600 eliminates mechanical wear and greatly reduces maintenance costs.

Accurate Flow Detection

Thermal dispersion sensing provides highly stable switching performance across a wide flow range while remaining unaffected by pressure fluctuations.

Reliable Pump Protection

Instantly detects insufficient flow and helps prevent expensive pump damage caused by dry running or blocked pipelines.

Simple Installation

Compact construction and multiple output options allow quick integration into new or existing industrial systems.

Visual Flow Monitoring

Integrated LED indicators provide immediate visual confirmation of current flow conditions and switching status.

Installation Recommendations

• Install the sensor where the pipeline remains completely filled with liquid.
• Ensure the sensing probe is fully immersed in the flowing medium.
• Avoid installation near elbows, valves or pumps whenever possible.
• Observe the required flow direction during installation.
• Clean the probe periodically when monitoring contaminated or scaling liquids.
• Verify wiring and supply voltage before energizing the device.

Industries Served

The thermal dispersion flow switch NK600 is suitable for numerous industries, including:

• Oil & Gas
• Chemical Processing
• Water & Wastewater Treatment
• Power Generation
• Steel & Metallurgy
• Food & Beverage
• Pharmaceutical Manufacturing
• Paper & Pulp
• HVAC
• Industrial Automation
• Machinery Manufacturing

Why Choose NOIKE-AH Thermal Dispersion Flow Switch NK600?

The NOIKE-AH thermal dispersion flow switch NK600 combines thermal dispersion technology, industrial durability, accurate flow monitoring, and maintenance-free operation into one compact solution. Its rugged construction, wide application compatibility, and reliable switching performance make it an excellent choice for protecting pumps, monitoring process flow, and improving industrial automation efficiency.