NK800 Mechanical Flow Switch

Product Overview

The NK800 Series Mechanical Flow Switch is designed for reliable flow monitoring of liquids and gases in industrial systems. It features low pressure loss, excellent repeatability, and strong anti-fouling performance. The mechanical and electronic components are completely isolated, making it suitable for economical low-flow applications.

Compared with the original NK800 design, the piston stroke setting accuracy is increased by three times. The integrated switch setting scale eliminates the need for on-site adjustment. The LED indicator displays the switch status, and dual switch outputs are available as an option. The flow switch supports inline installation and optional housing configurations.

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Principle Structure

The NK800 series mechanical flow switch provides minimal pressure loss, good repeatability, and excellent anti-fouling capability. The mechanical and electronic sections are completely isolated, making it suitable for economical low-flow applications.

The piston stroke setting accuracy is three times higher than that of the original NK800. With the built-in switch setting scale, no on-site adjustment is required. The LED indicator displays the switch status, and dual switch output is available as an option.

The flow switch is suitable for liquid and gas media, supports inline installation, and is available with optional housing configurations.

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Product Features

• Low pressure loss for efficient system performance
• High repeatability for stable switching
• Strong anti-fouling capability
• Complete isolation between mechanical and electronic components
• Three-times higher piston stroke setting accuracy than the original NK800
• Factory-calibrated switch setting scale reduces installation time
• LED switch status indication (DC models)
• Optional dual switch output
• Suitable for liquid and gas media
• Inline installation with optional housing

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Applicable Medium

• Water
• Oil

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Product Applications

The NK800 mechanical flow switch is suitable for:

• Industrial automation
• Mechanical equipment
• Air compressor systems
• Refrigeration systems
• Air conditioning (HVAC)
• Gas and liquid flow monitoring

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Why Choose the NK800 Mechanical Flow Switch?

The NK800 mechanical flow switch combines low pressure loss, stable switching performance, and simple installation in one compact design. Its anti-fouling piston structure, factory-calibrated setting scale, and optional dual outputs help reduce commissioning time while providing reliable flow monitoring for industrial water, oil, and gas applications.

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Technical Specifications

Parameter	Specification
Setting Range	See parameter table for details
Accuracy	±5% of full scale
Hysteresis	Depends on the switch point, minimum 0.5 L/min
Switch Setting Scale	Calibrated using water at 20°C with horizontal installation. Medium type, installation position, and temperature changes may slightly affect the switching value.
Wiring Method	M12 5-pin connector; Hirschmann connector (optional)
LED Display	DC-powered models display switch status; AC-powered models do not include LED indication
Output	Reed switch, 24VDC / 250VAC, 100mA
Pressure Rating	50 bar (Aluminum version); 100 bar (Stainless steel version)
Average Pressure Loss	0.3 bar (at 25 L/min)
Maximum Medium Temperature	90°C
Protection Rating	IP65

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Wiring diagram

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Installation direction

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Size chart

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Attachment – Connectors

Typical Application

The NK800 mechanical flow switch is commonly installed in cooling water circuits, air compressor systems, refrigeration equipment, and industrial machinery to monitor flow conditions. When the flow falls below the preset value, the reed switch outputs a signal to the control system, enabling equipment protection and stable process operation.

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Frequently Asked Questions

What media can the NK800 monitor?

The NK800 is suitable for water and oil and supports both liquid and gas flow monitoring applications.

Does the NK800 require on-site calibration?

No. The integrated switch setting scale is factory calibrated, reducing installation and commissioning time.

Is the NK800 suitable for HVAC and air compressor systems?

Yes. It is suitable for industrial automation, HVAC, refrigeration, and compressed air systems.

What protection level does the NK800 provide?

The NK800 has an IP65 protection rating, suitable for industrial environments.

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Summary

The NK800 Mechanical Flow Switch provides reliable flow monitoring with low pressure loss, high repeatability, anti-fouling performance, and easy installation, making it suitable for water, oil, and gas monitoring in industrial automation, HVAC, refrigeration, and mechanical equipment.