Bently Nevada 3300/16 Dual Vibration Monitor

This dual vibration monitor measures radial shaft vibration in rotating machinery. It processes signals from proximity probes for reliable amplitude and phase data. The unit integrates into the Bently Nevada 3300 monitoring system rack.

Technical Specifications

Parameter	Specification
Model Number	3300/16-12-01-02-03-02-00
Product Type	Dual Vibration Monitor
Supply Voltage	24 V DC ±10%
Power Consumption	10 W (maximum)
Input Channels	2 x proximity probe (dual, independent)
Input Range	-24 V to -3 V DC (proximity)
Measurement Range	0 to 200 µm peak-to-peak (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	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 Power	-24 V DC (regulated, per channel)
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	0.46 kg

Mechanical Design and Rack Integration

This dual vibration monitor follows the standard 3300 series rack form factor. Its 26 mm width occupies a single slot in the chassis. The unit weighs 0.46 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 10 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 Signal Processing

Two independent channels accept standard proximity probe inputs. The input range covers -24 V to -3 V DC for reliable gap detection. The measurement range spans 0 to 200 micrometers peak-to-peak. The frequency response covers from 0.5 Hz to 10 kHz for comprehensive vibration analysis. This range suits most turbine and compressor monitoring applications.

Measurement Performance and Resolution

The 16-bit resolution delivers precise vibration amplitude measurements. The accuracy reaches ±0.3 percent of full scale at room temperature. The module processes both overall vibration and filtered sub-harmonics. It also calculates the phase angle relative to a keyphasor reference signal.

Output and Alarm Capabilities

Two isolated 4–20 mA outputs transmit vibration 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 real-time signal 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 vibration 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 vibration exceeds warning thresholds. Two Danger LEDs activate when vibration reaches shutdown levels. These visual aids simplify troubleshooting during commissioning.

Application Suitability

This dual vibration monitor serves critical rotating equipment across many industries. It works effectively with steam turbines, gas turbines, and compressors. The device also monitors pumps, motors, and paper machine rolls. Its operating temperature ranges from -20°C to +65°C.