4NN-K2-N4-B1A SOR Piston Pressure Control 750 PSI Overrange

Engineering Design & Performance Profile

• The 4NN-K2-N4-B1A is a heavy-duty industrial pressure switch from the SOR 4NN series.
• It utilizes a force-balance piston actuator for high-cycle reliability in hydraulic and pneumatic systems.
• This model is specifically designed for low-pressure set points between 2 and 8 PSI.
• The 4NN-K2-N4-B1A can withstand massive overpressure surges up to 750 PSI without losing calibration.

Technical Specification Matrix

• Manufacturer: SOR (Static "O" Ring)
• Model: 4NN-K2-N4-B1A
• Adjustable Range: 2 to 8 PSI (increasing)
• Typical Deadband: 0.2 PSI
• Overrange Pressure: 750 PSI
• Proof Pressure: 1000 PSI
• Actuator: Piston type
• Compatibility: Non-corrosive liquids and gases

Global PLC Spare HUB's Insight

• The 4NN-K2-N4-B1A is unique due to its high overrange protection relative to its low trip point.
• Engineers prefer the SOR piston design for its immunity to metal fatigue, which often plagues diaphragm-type switches.
• This unit is a "fit-and-forget" solution for critical lubrication and cooling loops.

Diagnostic Capabilities & Application Scope

• Calibration Diagnostics: The stable 0.2 PSI deadband allows for precise verification of switching repeatability.
• Mechanical Integrity: A high proof pressure of 1000 PSI ensures the switch remains a safe containment barrier even during system failure.
• Suitable Equipment: Lubrication systems, air compressors, and hydraulic power units (HPU).
• Typical Uses: Low-pressure alarms, pump protection, and sequence control.

Commercial & Logistics Strategy

• Dispatch: Global shipping within 24-48 hours.
• Shipping Partners: Express delivery via FedEx, UPS, and DHL.
• Warranty: Includes a full 12-month quality guarantee.
• Authenticity: Guaranteed genuine SOR hardware in factory condition.

Professional FAQ & Selection Guide

• Why choose a piston design for low-pressure ranges?
• The 4NN-K2-N4-B1A provides massive overpressure protection (750 PSI) that would destroy a standard diaphragm switch.
• How is the set point adjusted?
• Adjustment is handled via an internal nut; it is recommended to calibrate against a certified pressure source.
• Is this model suitable for vacuum?
• No, it is strictly designed for positive pressure monitoring within the 2-8 PSI window.
• What happens if the 750 PSI overrange is exceeded?
• The switch may lose its calibration accuracy; if the 1000 PSI proof pressure is reached, the housing may suffer permanent damage.
• Does the deadband require frequent adjustment?
• No, the 0.2 PSI deadband is a mechanical characteristic of the spring/piston assembly and remains consistent over the life of the unit.

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