SOR 107AL-N40 Low Pressure Switch for HVAC & Burner Management

Global PLC Spare HUB’s Insight

• The 107AL-N40-P1-F0A-X represents a pinnacle in micro-differential pressure sensing.
• Unlike standard industrial switches, this model utilizes an oversized diaphragm to capture minute pressure fluctuations.
• This design ensures high sensitivity in draft ranges for precision control.
• It is an essential component for safety-critical environments requiring SIL 1 or SIL 2 compliance.
• Engineering teams favor this unit for its robust cast iron housing and hermetically sealed switching elements.

Product Introduction

• The 107AL-N40-P1-F0A-X is a field-mounted differential pressure switch designed for high-precision industrial monitoring.
• This instrument excels in detecting very low pressures within air or gas services.
• It features a SPDT switching element for reliable signal output to control systems.
• The rugged construction suits demanding process industries and hazardous locations.
• Users can easily perform site calibrations via the external set point adjustment.
• The integrated visual scale provides immediate feedback during manual operation and setup.

Technical Specifications

• Brand: SOR Controls Group (SOR)
• Model Number: 107AL-N40-P1-F0A-X
• Pressure Range: Optimized for low differential and draft ranges.
• Maximum System Pressure: 10 psig (0.69 bar) with vacuum protection to 30” Hg.
• Switching Element: SPDT explosion-proof hermetically sealed capsule.
• Electrical Rating: 5 Amps at 250 VAC and 5.0 Amps at 30 VDC (resistive).
• Temperature Limits: Ambient and process range from -40 to 150°F (-40 to 65°C).
• Housing Material: Durable Cast Iron for maximum environmental protection.
• Body and Port Material: 356-T6 aluminum body with plated cold-rolled steel ports.
• Connection Size: 1/8” NPT(F) process connection and 1/2” NPT(M) electrical conduit.
• Sensitivity: High-accuracy sensing via a large surface area diaphragm.
• Safety Integrity: Certified for use in SIL1 and SIL2 environments.

Installation and Compatibility

• Mount the 107AL-N40-P1-F0A-X vertically to ensure optimal diaphragm performance.
• The unit integrates seamlessly with Honeywell, ABB, and Siemens HVAC controllers.
• Use 18-AWG color-coded stranded wire leads for all electrical terminations.
• Verify wetted materials like Buna-N and Stainless Steel match your process media.
• This switch fits Class I, Groups A, B, C, D hazardous locations.
• It serves as a direct replacement for legacy low-pressure mechanical monitors.

Commissioning and Maintenance

• Adjust the external set point using a standard wrench during live operation.
• The visual indication scale simplifies the calibration process for field technicians.
• Inspect the diaphragm housing periodically for debris accumulation in gas lines.
• Hermetically sealed contacts eliminate the need for internal cleaning or contact filing.
• Check electrical seals to maintain the weathertight integrity of the 107AL series.

Certified Applications and Diagnostics

• HVAC Systems: Monitors filter pressure drops and airflow in large ducts.
• Burner Management: Ensures proper draft pressure before boiler ignition sequences.
• Vibration Monitoring: Complements Bently Nevada systems in machinery protection loops.
• Safety Systems: Functions reliably within Safety Instrumented Systems (SIS).
• Diagnostics: Detects restricted filters or failing fan motors through pressure shifts.

Shipping and Warranty

• Package Includes: One 107AL-N40-P1-F0A-X unit and technical manual.
• Warranty: 12-month comprehensive professional warranty included.
• Dispatch Time: Orders ship within 24 to 48 hours.
• Shipping Carriers: Worldwide express delivery via FedEx, UPS, or DHL.

Global PLC Spare HUB Review

• Our technical assessment confirms the 107AL-N40-P1-F0A-X is superior for low-flow detection.
• The mechanical snap-action is crisp and repeatable over thousands of cycles.
• It outperforms electronic sensors in high-interference electrical environments.
• This hardware is compatible with DCS and PLC inputs across all major industrial platforms.

FAQ and Buying Guide

• How do I select the correct port size for this series?
• The standard model uses 1/8” NPT; specify F1A if you require 1/4” NPT connections.
• Can I use this switch for outdoor installations?
• Yes, the weathertight and explosion-proof housing handles harsh ambient conditions.
• Is this model suitable for safety-related trip circuits?
• Yes, it carries IEC 61508 certification for SIL1 and SIL2 applications.
• What is the advantage of the large sensing diaphragm?
• It provides the mechanical leverage needed to trip the switch at very low pressures.
• Does the unit support DC loads?
• It supports up to 5.0 Amps at 30 VDC for resistive industrial loads.

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