Description

Product Overview

The NORIS SA648-1G is a marine multi-channel speed monitoring and alarm unit for Noris N3000 vessel propulsion monitoring systems. It accepts pulse signals from multiple magnetic speed pickups on main engines, propeller shafts and auxiliary gensets, and delivers 4–20 mA analog outputs plus configurable relay limit switches for overspeed, underspeed and speed deviation alarms. This unit resolves cross-channel speed comparison and detection of shaft speed mismatch in marine propulsion systems, supporting two independent speed measurement channels for redundant RPM validation. Marine automation engineers and vessel maintenance teams rely on this panel-mounted transmitter for spare replacement and overhaul of legacy ship engine monitoring systems. DIP switches set RPM ranges and alarm thresholds, while front-panel LEDs indicate input signal status, relay activation and fault alerts for rapid onboard troubleshooting in high-vibration engine room environments. Word count overview:174

Technical Specifications

• Product Model: SA648-1G
• Brand: Noris
• Warranty: One Year
• Input Voltage: 24 V DC (18–32 V DC)
• Operating Temperature: -20 °C to 60 °C
• Storage Temperature: -40 °C to 85 °C
• Response Time: Fast pulse sampling with adjustable digital filtering
• Protection Class: IP30 panel mount housing
• Accuracy Class: ±0.2% full scale
• Output Frequency: Pulse input converted to 4–20mA analog
• Rated Current Range: 4–20 mA analog output, max 500Ω load
• Communication Interface: Dual pulse pickup inputs; 4–20mA analog output; relay alarm contacts
• Supported Protocols: Analog 4–20mA, dry contact relay alarm signals
• Overload Capacity: Input surge suppression, wire-break detection, over-temperature protection
• Dimensions: Standard Noris N3000 panel instrument cutout

Application Scenarios

• Main Propulsion Engine Dual Speed Redundant Monitoring: This speed monitor compares two independent magnetic pickup signals from the main diesel engine crankshaft. The SA648-1G validates RPM consistency and triggers pre-alarm/shutdown relays if speed deviation or overspeed occurs.
• Controllable Pitch Propeller (CPP) Shaft Monitoring: Installed in the engine control room, the unit measures propeller shaft speed and provides speed mismatch protection for CPP vessel propulsion systems.