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This XY/gap dual vibration monitor measures both radial vibration and shaft position. It processes signals from proximity probes for comprehensive rotor dynamics analysis. The unit integrates into the Bently Nevada 3300 monitoring system rack.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model Number | 3300/16-12-01-02-00-02-00 |
| Product Type | XY/Gap Dual Vibration Monitor |
| Supply Voltage | 24 V DC ±10% |
| Power Consumption | 11 W (maximum) |
| Input Channels | 2 x proximity probe (dual, independent) |
| Input Range | -24 V to -3 V DC (proximity) |
| Vibration Range | 0 to 200 µm peak-to-peak (configurable) |
| Gap Range | 0 to 2.0 mm (configurable) |
| Frequency Response | 0.5 Hz to 10 kHz (±3 dB) |
| Resolution | 16-bit (including sign) |
| Accuracy | ±0.3% of full scale (at 25°C) |
| Outputs | 4 x 4–20 mA (vibration + gap, isolated) |
| Alarm Relays | 4 x Form C (SPDT, 2 A at 30 V DC) |
| Communication | 1 x RS-485 (Modbus RTU) |
| Sensor Power | -24 V DC (regulated, per channel) |
| Status Indicators | 8 x LED (Power, OK, Alert x2, Danger x2, Gap x2) |
| Mounting | Backplane rack |
| Dimensions (W x H x D) | 26 mm x 223 mm x 175 mm |
| Weight | 0.47 kg |
Mechanical Design and Rack Integration
This XY/gap monitor follows the standard 3300 series rack form factor. Its 26 mm width occupies a single slot in the chassis. The unit weighs 0.47 kilograms and features a rugged front panel. All connectors and indicators are front-accessible for convenient installation.
Power Supply and Electrical Characteristics
The device operates from a 24 V DC supply with a ±10 percent tolerance. It consumes a maximum of 11 watts during full operation. The module provides regulated -24 V DC for each proximity probe channel. Internal circuitry includes reverse polarity and overvoltage protection.
Input Configuration and Dual Measurement
Two independent channels accept standard proximity probe inputs. Each channel simultaneously measures both vibration and gap voltage. The vibration range spans 0 to 200 micrometers peak-to-peak. The gap range covers 0 to 2.0 millimeters of shaft position. This dual capability provides comprehensive rotor condition information.
Measurement Performance and Accuracy
The 16-bit resolution delivers precise measurements for both parameters. The accuracy reaches ±0.3 percent of full scale at room temperature. The module processes vibration amplitude and gap voltage concurrently. It also calculates the relative phase between XY probes when installed orthogonally.
Output and Alarm Capabilities
Four isolated 4–20 mA outputs transmit data to control systems. Two outputs carry vibration amplitude for each channel. Two outputs carry gap voltage for each channel. Four Form C relays provide alert and danger functions for each channel. These relays handle up to 2 amperes at 30 V DC.
Communication and Remote Access
An RS-485 port supports Modbus RTU for remote monitoring and configuration. This interface enables integration with plant-wide control networks. Users can read real-time vibration, gap, and alarm status remotely. The module also stores peak values for trend analysis.
Diagnostic Features and Status Indication
Eight front-panel LEDs provide comprehensive operational feedback. The Power LED confirms correct supply voltage is present. The OK LED indicates normal sensor operation and module health. Two Alert and two Danger LEDs show vibration alarm status. Two Gap LEDs indicate gap voltage within acceptable range.
Application Suitability
This XY/gap monitor serves critical rotating equipment requiring both vibration and position data. It works effectively with steam turbines, gas turbines, and large compressors. The device also monitors generators and pumps with thrust bearings. Its operating temperature ranges from -20°C to +65°C.