Bently Nevada 3300/16-12-01-01-00-00-00 XY/Gap Dual Vibration Monitor

Product Overview

The 3300/16-12-01-01-00-00-00 (also known as 145323-01) delivers continuous dual-channel vibration monitoring for critical turbomachinery. This monitor accepts eddy‑current proximity probe inputs and measures both vibration amplitude and shaft gap voltage simultaneously. Plant operators depend on this module for reliable radial vibration surveillance in turbines, compressors, and large pumps.

Key Specifications

Dual-Channel Vibration and Gap Monitoring

This module supports two independent channels in an XY configuration for radial shaft monitoring. Each channel processes proximity probe signals to derive both vibration and gap voltage values. The frequency response spans from 0.5 Hz to 5 kHz, covering low and high-speed machinery effectively. Operators can configure each channel for specific measurement units and full-scale ranges. The simultaneous vibration and gap outputs provide complete insight into shaft condition.

Probe Excitation and Signal Conditioning

The monitor supplies -24 V DC excitation voltage for powering connected eddy‑current proximity probes. Precision demodulation circuits extract both AC vibration components and DC gap voltage from probe signals. Built-in filtering minimizes electrical noise interference for accurate measurements. Consequently, the device delivers reliable data even in challenging industrial environments with significant electrical noise.

Alarm Configuration and Relay Outputs

Four adjustable alarm setpoints (Alert and Danger per channel) protect the monitored machinery effectively. Users can set these thresholds via front-panel potentiometers based on specific application requirements. Each channel provides two SPDT relay outputs for connecting to external alarm and shutdown systems. The relays activate immediately when vibration levels exceed their configured setpoints. A bypass mode allows maintenance personnel to perform work without triggering nuisance alarms.

Analog Outputs for System Integration

The device generates 4–20 mA outputs proportional to vibration amplitude for both channels. Additionally, it supplies 0–10 V DC outputs representing the probe gap voltage for each position. These analog signals interface directly with DCS, PLC, and data acquisition platforms. The standard 4–20 mA range simplifies integration with existing plant control infrastructure. The gap outputs enable continuous shaft position tracking for bearing health assessment.

Mechanical Design and Rack Installation

This plug-in module measures 165 mm × 25 mm × 102 mm and weighs only 0.30 kg. It occupies a single slot within the standard 3300 series chassis. Front-panel LEDs provide clear visual status for power, channel health, Alert, and Danger conditions. A locking handle secures the module firmly in the backplane connector. The compact form factor enables high-density configurations in monitoring racks.

Power and Diagnostic Features

The module draws 115 mA from the +24 V DC backplane supply and generates internal -24 V excitation. This self-contained power design eliminates the need for separate probe power supplies. Built-in open-circuit detection identifies faulty probe connections or broken cables promptly. Front-panel indicators display channel OK status for immediate fault recognition. These diagnostic capabilities help maintenance teams locate and resolve issues quickly.

Application and Operational Guidance

This monitor suits steam turbines, centrifugal compressors, and large pumps in power and process industries. Insert the module into an available chassis slot and connect probe cables to front-panel terminals. Set measurement units and ranges using internal configuration switches. Adjust alarm thresholds with front-panel potentiometers and verify gap voltage readings. Monitor front-panel LEDs regularly to confirm normal channel operation.