NFS22 Series Mechanical Flow Switch Technical Specifications‌

Here is the professional English translation of the provided technical specification for the NFS22 series mechanical flow switch:

NFS22 Series Mechanical Flow Switch Technical Specifications‌

Product Overview‌

The NFS22 series is an insertion-type mechanical flow monitoring device. Utilizing the principle of magnetic coupling to achieve electrical-fluid isolation, it incorporates a high-reliability microswitch. Through innovative structural design, this product resolves issues commonly associated with traditional paddle-type flow switches, such as bellows vulnerability and condensation-induced corrosion. It is suitable for central air-conditioning systems and industrial fluid control applications.

Core Technical Features‌

Precise Adjustment System‌

Rotatable setting knob achieves ±2% flow setting accuracy

Maximum pressure loss only 0.01 bar (at full-scale conditions)

Long-Term Stable Structure‌

Magnetic transmission mechanism completely isolates electrical components from fluid contact

Bellows-free design eliminates failure risks inherent in traditional structures

IP65 protection rating, resistant to corrosive environments

Industrial-Grade Electrical Performance‌

German-imported microswitch with contact rating: 5A/250VAC

Bistable SPDT output, supports direct drive of control circuits

Technical Parameters‌

Parameter Specification

Interface Standard DN20/DN25 External Thread

Medium Temperature -30°C ~ 110°C (Operating)

Pressure Rating Standard 25 bar (Optional 40 bar)

Electrical Output SPDT Microswitch

Housing Material Nickel-Plated Brass (Wetted Parts)

Installation Orientation Horizontal/Vertical (Inverted mounting prohibited)

Engineering Application Guide‌

Installation Requirements‌

Ensure upstream/downstream straight pipe sections ≥5x pipe diameter

Medium flow direction must align with housing marking

Paddle must not contact pipe wall or throttling elements

Safety Regulations‌

Disconnect power before wiring

Use designated grounding terminals only

Do not adjust non-calibrated screws

This product is certified under the ISO9001 Quality Management System. Typical applications include:

Chiller flow protection

Hydraulic system lubrication monitoring

Process pipeline fluid detection

(Note: Specific model selection must consider actual operating parameters. System design by professional engineers is recommended.)