Description

The Bently Nevada 3300/55 Dual Velocity Monitor is a rack-mounted module within the 3300 Series monitoring system. It is specifically engineered to measure casing vibration velocity by interfacing with Velomitor piezo-velocity sensors. The 3300/55-01-05-12-12-00-00-05-00 configuration provides two independent channels of vibration monitoring, featuring enhanced input scaling and relay logic designed for the protection of critical turbomachinery.

Features

• Dual-channel independent velocity measurement.
• Compatible with standard Velomitor piezo-velocity sensors.
• Proportional 4-20 mA outputs for integration with external control systems (DCS/PLC).
• Configurable relay outputs for Alert and Danger alarm conditions.
• Front-panel LED status indicators for OK, Bypass, Alert, and Danger states.
• Enhanced input scaling and alarm logic for precise machinery protection.

Applications

This module is widely used in industrial environments for continuous monitoring of critical rotating equipment, including steam turbines, gas turbines, centrifugal compressors, and large pumps. It provides the necessary signal processing to detect casing vibration anomalies and trigger protective shutdowns or operator alerts.

Technical Specifications

Installation Guidelines

• Ensure the 3300 rack is powered down before inserting or removing the module to prevent electrical damage.
• Verify that the module is properly seated in the rack slot and that the front-panel screws are tightened to ensure a secure ground connection.
• Use shielded twisted-pair cabling for sensor inputs to minimize EMI/RFI interference.
• Maintain proper ventilation within the cabinet to ensure the ambient temperature remains within the 0 degC to +60 degC range.
• Follow standard ESD (Electrostatic Discharge) handling procedures when touching internal components or connectors.

FAQ

What is the primary function of the 3300/55 module?

The 3300/55 is designed to monitor casing vibration velocity. It processes signals from two Velomitor sensors and compares them against user-defined Alert and Danger setpoints to protect rotating machinery.

Can this module be used in hazardous areas?

This specific order code (3300/55-01-05-12-12-00-00-05-00) includes standard input barrier configuration (no intrinsic safety). Please verify your site's hazardous area requirements before installation.

What do the LED indicators on the front panel represent?

The LEDs provide immediate visual feedback for the module's health and the status of the monitored machinery, specifically indicating OK (sensor/module health), Bypass (maintenance mode), Alert, and Danger alarm conditions.