Description

Bently Nevada 3300/16 Dual Vibration Monitor

The Bently Nevada 3300/16, also cataloged as the 3300/16 Dual Vibration Monitor, operates as a dedicated hardware component for continuous rotor vibration monitoring within machinery protection systems. It accepts dual independent proximitor transducer inputs and provides analog outputs, alarm relays, and front-panel display for real-time condition assessment.

Hardware Specifications

Parameter	Specification
ModelBrand	Bently Nevada 3300/16
Origin	USA
Weight	1.1 kg (2.4 lbs)
Dimensions	Standard 19-inch rack-mount width, 3U height (approximate)
OperatingTemp	0 degC to +65 degC
StorageTemp	-40 degC to +85 degC
RelativeHumidity	Up to 95%, non-condensing
PowerConsumption	Typical <10 W
TransducerInputs	2 channels, 5mm/8mm/11mm Proximitor systems
InputImpedance	10 kOhm nominal
BufferedOutputs	Coaxial front panel, terminal block rear panel, 100 Ohm impedance, short-circuit protected
RecorderOutputs	4-20 mA or 1-5 Vdc per channel
FrequencyResponse	Standard: 4 Hz to 4 kHz; Optional Low-Freq: 1 Hz to 4 kHz (-3 dB)
Accuracy	±0.5% of full scale at 25 degC
AlarmSetpoints	Alert/Danger, 0-100% full scale, programmable time delay 0.1–6 s
RelayOutputs	SPDT, 5 A @ 120 Vac / 24 Vdc resistive, epoxy/hermetic/pneumatic options
FrontPanelDisplay	Digital LED, bar graph, gap voltage monitoring

Rotordynamics & GapVoltage Validation

The 3300/16 monitor includes eddy-current probe scaling for precise rotor vibration measurement. Gap voltage validation supports direct measurement against -10 Vdc reference targets to confirm probe-to-shaft clearance. Cross-talk suppression circuits isolate each channel to reduce interference between dual proximitor inputs, maintaining integrity of rotordynamic analysis.

Frequently Asked Questions

Q: Does the 3300/16 support hot-swap of transducer modules?
A: No, the module requires system power-down before input transducer replacement to avoid signal damage.

Q: What is the maximum load on recorder outputs?
A: Buffered 4-20 mA outputs are rated for standard 500 Ohm maximum load; voltage outputs maintain 1-5 Vdc over typical 1 kOhm load.

Q: Can firmware updates be applied in the field?
A: The 3300/16 is a legacy analog monitor; firmware is fixed and not field-upgradable.

Field Installation Guidelines

• Mount the monitor on a stable, vibration-free panel or 19-inch rack.
• Ensure all proximitor cabling is shielded and grounded at one end to minimize electrical noise.
• Maintain separation between analog signal wiring and high-voltage or digital communication lines.
• Verify proper orientation of the front panel to facilitate gap voltage measurement access.
• Install relays according to current ratings; use external suppression diodes if driving inductive loads.
• Confirm environmental limits: avoid condensation and direct exposure to high heat sources.

Specifications

• Brand: Bently Nevada

Advantages

• High reliability in industrial environments
• Supports continuous operation
• Compatible with major PLC/DCS systems