Description Product Description The SOR 4NN-K2-N4-B1A is a rugged industrial pressure switch. SOR designed this unit with a force balance piston. This switch works well for hydraulic and pneumatic systems. The adjustable pressure range goes from 2 to 8 PSI (0.14 to 0.56 bar). Typical dead band is 0.2 PSI for accurate switching. The maximum over range is 750 PSI. The proof pressure rating is 1000 PSI. The 4NN-K2-N4-B1A provides reliable pressure monitoring. Its piston design handles tough industrial conditions. You can adjust the set point easily in the field. Contact our team for questions. Inquiries: 86 158 8020 0923 Technical Specifications Brand: SOR Model: 4NN-K2-N4-B1A Product Type: Industrial Pressure Switch Series: 4NN Series Pressure Ratings Adjustable range (increasing pressure): 2 to 8 PSI Typical dead band: 0.2 PSI Maximum over range: 750 PSI Proof pressure: 1000 PSI Operating Principle Force balance piston design Suitable for hydraulic systems Suitable for pneumatic systems Model Number Breakdown 4NN – Series code for piston pressure switch K2 – Pressure range code (2-8 PSI) N4 – Electrical housing and connection code B1A – Option and approval code Contact us for the full model code definition guide. Key Features The SOR 4NN-K2-N4-B1A offers several important features. Force balance piston gives accurate and repeatable switching Wide over range capacity of 750 PSI protects the switch Proof pressure of 1000 PSI ensures durability Low dead band of 0.2 PSI for tight control Adjustable set point suits many applications Rugged construction handles industrial environments Installation Guide Follow these steps to install the SOR 4NN-K2-N4-B1A correctly. Turn off all pressure to the system before starting Mount the switch in a vertical or horizontal position Clean the pressure port threads before connection Apply thread sealant to the pipe fitting Connect the pressure line to the 1/4 inch NPT port Do not use Teflon tape on the switch threads Tighten the fitting by hand plus one half turn Wire the electrical contacts to your control circuit Apply pressure slowly to avoid shock Do not exceed 1000 PSI proof pressure. Over pressure above 1000 PSI may damage the piston. Adjustment and Calibration The 4NN-K2-N4-B1A allows simple field adjustment. Remove the housing cover to access the adjustment nut Turn the adjustment nut clockwise to raise the set point Turn the adjustment nut counter-clockwise to lower the set point Use a calibrated pressure source to verify the set point Apply increasing pressure until the switch trips Adjust until the switch trips at your desired pressure Replace the housing cover after adjustment Test the switch annually to ensure accurate operation. Maintenance Tips The SOR 4NN-K2-N4-B1A needs very little maintenance. Check the pressure connection for leaks every 6 months Verify the set point with a test pressure annually Clean any debris from the pressure port Inspect the electrical housing for moisture Replace the switch if the piston shows wear Do not try to repair the internal mechanism The force balance piston design has no seals to leak. Compatibility Notes The 4NN-K2-N4-B1A works with many hydraulic and pneumatic fluids. Compatible media include mineral oil, synthetic oil, air, and nitrogen. The wetted materials limit chemical compatibility. Avoid strong acids, bases, and solvents. The switch is compatible with 11 mm Proximity Probes and other control systems. Typical Applications The SOR 4NN-K2-N4-B1A suits many industrial pressure applications. Hydraulic system pressure monitoring Pneumatic system pressure control Lubrication system pressure verification Pump discharge pressure monitoring Filter blockage detection Compressor pressure control Press machine pressure interlock Test stand pressure measurement Diagnostics and Troubleshooting The 4NN-K2-N4-B1A gives simple go/no-go output. Switch closes when pressure reaches set point No output indicates no pressure or a faulty switch Use a multimeter to check contact continuity Apply known pressure to test switch operation Listen for an audible click when the switch trips Check for debris in the pressure port For critical applications, use two switches in series. Package Contents Your shipment includes the following items. 1 x SOR 4NN-K2-N4-B1A pressure switch 1 x Installation and operation manual 1 x Adjustment wrench (if applicable) No pressure tubing or fittings are included with the 4NN-K2-N4-B1A. No mounting bracket is included. You must buy these separately. Warranty: 12 months from shipment date. This covers manufacturing defects only. It does not cover damage from over pressure, water hammer, or improper installation. Shipping carriers: FedEx, UPS, DHL. You choose the carrier at checkout. Tracking is provided within 24 hours. Frequently Asked Questions (FAQ) 1. What is the warranty period for the 4NN-K2-N4-B1A? We provide a 12-month warranty from the shipment date. This covers defects in materials and workmanship. It does not cover damage from over pressure or water hammer. 2. Which shipping carriers do you use for this switch? We ship the SOR 4NN-K2-N4-B1A via FedEx, UPS, or DHL. You select your preferred carrier at checkout. All shipments include tracking and basic insurance. 3. What is the difference between over range and proof pressure? Over range (750 PSI) is the maximum pressure for normal operation without damage. Proof pressure (1000 PSI) is the test pressure the switch withstands once. Do not exceed either rating. 4. Can I use this switch for vacuum applications? No. The 4NN-K2-N4-B1A uses a force balance piston. It does not work below atmospheric pressure. For vacuum, choose a SOR diaphragm pressure switch. 5. My switch does not trip at the set point. What should I check? First, verify your pressure source is working. Second, check for blocked pressure ports. Third, test the switch with a calibrated pressure source. Fourth, examine the adjustment nut position. If still not working, the piston may have failed. 6. How do I choose between a piston and diaphragm pressure switch? Use piston switches for hydraulic oil and high cycle life. Use diaphragm switches for low pressure, corrosive media, or vacuum. The 4NN-K2-N4-B1A suits hydraulic and pneumatic systems best. Why Choose the SOR 4NN-K2-N4-B1A? This force balance piston pressure switch gives you reliable service for hydraulic and pneumatic systems. The SOR 4NN-K2-N4-B1A has an adjustable range of 2 to 8 PSI. Dead band is only 0.2 PSI for tight control. Over range capacity reaches 750 PSI without damage. Proof pressure goes up to 1000 PSI for safety. The rugged design handles industrial environments. Field adjustment takes only minutes with basic tools. The piston design has no seals to leak or wear out. Use this switch for pump discharge, filter monitoring, and compressor control. Order the SOR 4NN-K2-N4-B1A today for your industrial pressure switch needs. Copyright © 2026 PLCDCS HUB Limited. All rights reserved. Original Source: https://plcdcshub.com/ Partner: Powergear X Automation Limited Oiltech Controls Limited
