Product Overview

The Mechanical Flow Switch NK800 Series is designed for inline flow monitoring and switch control of liquid and gas media. It features low pressure loss, excellent repeatability, and strong resistance to contamination, making it suitable for low-flow industrial applications where reliable flow detection is required.

The NK800 adopts a design in which the mechanical and electrical components are completely isolated, improving operational reliability. Compared with the original NK800 design, the piston stroke provides three times higher setting accuracy, allowing more precise switch point adjustment.

A built-in switch setting scale allows users to adjust the switching point without additional on-site calibration. The DC-powered version includes an LED status indicator, and dual switch output options are available for different control requirements.

Why Choose the Mechanical Flow Switch NK800 Series?

The NK800 Series is designed for reliable mechanical flow monitoring in industrial systems. Its key advantages include:

• Low pressure loss for efficient system operation
• High repeatability for stable switching performance
• Excellent anti-contamination capability
• Complete isolation between mechanical and electrical components
• Suitable for low-flow monitoring applications
• Piston stroke provides higher setting precision than the original NK800 design
• Built-in switch setting scale for convenient adjustment
• LED indicator for switch status (DC-powered models)
• Optional aluminum or stainless steel housing
• Suitable for both liquid and gas media

Working Principle

The NK800 Series uses a piston-based mechanical sensing mechanism to monitor flow.

As fluid or gas flows through the sensor, the piston moves according to the flow rate. When the flow reaches the preset switching point, the internal reed switch changes state and outputs a control signal.

The built-in switch setting scale allows the switching point to be adjusted directly. The mechanical sensing system and electrical switching components remain isolated, improving reliability in industrial environments.

Product Features

• Inline mechanical flow monitoring
• Suitable for liquid and gas media
• Low pressure loss
• Excellent repeatability
• Strong anti-pollution capability
• Mechanical and electrical isolation
• High-precision piston stroke adjustment
• Switch setting scale for easy adjustment
• LED switch status indication (DC models)
• Dual switch output options available
• Optional aluminum or stainless steel housing

Product Applications

The NK800 Series is suitable for flow monitoring in:

• Industrial automation systems
• Cooling systems
• Lubrication systems
• Hydraulic equipment
• Pneumatic systems
• Water circulation systems
• General industrial machinery
• Process control systems

Technical Specifications

Applicable Medium

Size chart

Parameter Table

The parameters within the brackets above are reset points, while those outside the brackets are action points; if there is a lower limit alarm (indicating that the monitored flow rate is too low), refer to the reset point parameters;
For the upper limit alarm (monitoring excessive flow), refer to the reset point parameter.
* The above parameters are obtained by testing with a 20°C water medium when the switch is installed vertically on a horizontal pipeline.

Typical Application Example

In industrial cooling systems, maintaining sufficient coolant flow is essential for protecting pumps and heat exchangers. The NK800 Series Mechanical Flow Switch can be installed directly in the pipeline to monitor flow conditions continuously. When the flow falls below the preset switching point, the reed switch outputs a control signal that can be connected to an alarm system or equipment controller, helping operators respond promptly to abnormal flow conditions.

Frequently Asked Questions

Can the NK800 monitor both liquids and gases?

Yes. The NK800 Series is suitable for both liquid and gas flow monitoring.

Does the flow switch require on-site calibration?

No. It includes a built-in switch setting scale that allows convenient adjustment without additional on-site calibration.

What housing materials are available?

The NK800 is available with aluminum or stainless steel housing options.

Does every model include an LED indicator?

No. The LED switch status indicator is available on DC-powered models only. AC-powered models do not include LED indication.

Summary

The NK800 Series Mechanical Flow Switch provides reliable inline flow monitoring for liquids and gases. Featuring low pressure loss, mechanical and electrical isolation, high repeatability, adjustable switch settings, and optional aluminum or stainless steel housing, it is suitable for a wide range of industrial flow control applications.