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This dual velocity monitor measures absolute casing vibration on rotating machinery. It accepts inputs from velocity transducers for reliable amplitude and frequency data. The unit integrates into the Bently Nevada 3300 monitoring system rack.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model Number | 3300/65-14-01-00-00-01-00 |
| Product Type | Dual Velocity Monitor Module |
| Supply Voltage | 24 V DC ±10% |
| Power Consumption | 9 W (maximum) |
| Input Channels | 2 x velocity transducer (self-generating) |
| Input Range | 0 to 50 mm/s peak (configurable) |
| Frequency Response | 2 Hz to 5 kHz (±3 dB) |
| Resolution | 16-bit (including sign) |
| Accuracy | ±0.5% of full scale (at 25°C) |
| Outputs | 2 x 4–20 mA (isolated, configurable) |
| Alarm Relays | 4 x Form C (SPDT, 2 A at 30 V DC) |
| Communication | 1 x RS-485 (Modbus RTU) |
| Sensor Excitation | None (self-generating transducers) |
| Status Indicators | 6 x LED (Power, OK, 2 x Alert, 2 x Danger) |
| Mounting | Backplane rack |
| Dimensions (W x H x D) | 26 mm x 223 mm x 175 mm |
| Weight | 0.44 kg |
Mechanical Design and Rack Integration
This velocity monitor follows the standard 3300 series rack form factor. Its 26 mm width occupies a single slot in the chassis. The unit weighs 0.44 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 9 watts during full operation. The module includes reverse polarity protection for the supply input. Self-generating velocity transducers do not require external excitation power.
Input Configuration and Signal Conditioning
Two independent channels accept standard velocity transducer inputs. Each channel measures absolute casing vibration in millimeters per second. The measurement range spans 0 to 50 mm/s peak velocity. The frequency response covers from 2 Hz to 5 kHz for comprehensive machinery analysis.
Measurement Performance and Accuracy
The 16-bit resolution delivers precise velocity measurements across the range. The accuracy reaches ±0.5 percent of full scale at room temperature. The module processes both overall velocity and filtered sub-components. It provides true RMS or peak detection based on user configuration.
Output and Alarm Capabilities
Two isolated 4–20 mA outputs transmit velocity data to control systems. Users can configure each output with independent scaling parameters. Four Form C relays provide alert and danger functions for each channel. These relays handle up to 2 amperes at 30 V DC. The module also provides a buffered output for external analysis.
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 velocity amplitude and alarm status remotely. The module also stores peak values for trend analysis.
Diagnostic Features and Status Indication
Six 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 LEDs illuminate when velocity exceeds warning thresholds. Two Danger LEDs activate when velocity reaches shutdown levels.
Application Suitability
This velocity monitor serves rotating equipment with casing vibration concerns. It works effectively with fans, blowers, pumps, and motors. The device also monitors compressors and medium-speed turbines. Its operating temperature ranges from -20°C to +65°C.