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Bently Nevada 3300/20-12-01-02-03-02 Dual Thrust Position Monitor

The Bently Nevada 3300/20-12-01-02-03-02, also cataloged as the 3300/20 Dual Thrust Position Monitor, operates as a dedicated hardware component for axial shaft displacement measurement using proximity transducer signals within Bently Nevada 3300 monitoring systems. It processes two thrust position channels and provides alarm, voting, and recorder outputs for machinery protection circuits.

Hardware Specifications

Parameter	Specification
Model	3300/20-12-01-02-03-02
Brand	Bently Nevada
Product Type	Dual Thrust Position Monitor
Origin	USA
Weight	Approximately 1.0 kg
Dimensions	83 mm vertical display bar graph
Operating Temp	0 deg C to +65 deg C
Storage Temp	-40 deg C to +85 deg C
Power Consumption	1.5 Watts nominal
Power Supply	120 VAC nominal
Monitoring Channels	2 independent thrust position channels
Full Scale Range	+/- 1.0 mm (40-0-40 mils)
Input Impedance	10 kOhm
Transducer Compatibility	3300 or 7200 Proximitor systems
Transducer Supply Voltage	Programmable -24 VDC or -18 VDC
Input Sensitivity	200 mV/mil (8 V/mm) or 100 mV/mil (4 V/mm)
Display Accuracy	+/- 1.6% of full scale
Signal Conditioning Accuracy	+/- 0.33% typical, +/- 1% maximum at +25 deg C
Alarm Relay Type	Hermetically sealed relays
Voting Logic	AND / OR dual-channel voting
Recorder Outputs	+4 to +20 mA, 0 to -10 VDC, +1 to +5 VDC
Buffered Outputs	Front panel coaxial and terminal connectors
Humidity Rating	Up to 95%, non-condensing
Safety Function	Internal safety barriers for field probe circuits
Certifications	CSA / NRTL / C compliant, Class 1 Division 2 ready

Eddy-Current Probe Scaling and Rotor Dynamics Monitoring

The 3300/20-12-01-02-03-02 processes eddy-current probe signals by applying configured sensitivity values for accurate axial position measurement. Therefore, the monitor maintains consistent scaling between probe displacement signals and displayed thrust position values.

The module supports gap voltage validation functions associated with Bently Nevada proximity measurement technology. Field probe installation typically uses a nominal -10 VDC gap voltage target to maintain proper linear operating range before machine operation.

Furthermore, the dual-channel architecture supports rotor dynamics analysis by monitoring axial movement changes caused by thrust loading variations. The AND/OR voting logic allows engineers to configure trip decisions according to machine protection requirements while reducing unwanted relay activation.

Frequently Asked Questions

Q: How many thrust position inputs does the 3300/20-12-01-02-03-02 monitor support?
A: The monitor supports two independent axial thrust position channels. Each channel accepts signals from compatible Bently Nevada 3300 or 7200 Proximitor systems.

Q: Does this model provide hazardous area signal isolation?
A: Yes. The -02 safety barrier option integrates internal safety barriers that limit energy delivered to field-installed proximity probes.

Q: What type of alarm relay configuration does this monitor use?
A: The -02 relay option provides hermetically sealed alarm relays designed for operation in environments where contact contamination may affect switching performance.

Field Installation Guidelines

• Install the monitor inside a compatible Bently Nevada 3300 rack environment following the system installation manual.
• Connect proximity probe signals using shielded cables and maintain proper cable separation from high-voltage power conductors.
• Verify probe polarity, signal scaling, and gap voltage before placing the machinery into operation.
• Adjust probe installation position to achieve the specified operating gap range and confirm the -10 VDC target gap voltage.
• Ground cable shields according to plant electrical grounding practices to reduce electromagnetic interference.
• Verify alarm relay logic settings, including AND/OR voting configuration, before enabling machinery protection functions.
• Confirm recorder output wiring for the selected current or voltage signal format before connecting external monitoring equipment.

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