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Bently Nevada 79482-01 3300 Series Dual Thrust Position Monitor

The Bently Nevada 79482-01, also cataloged as the 79482-01 Dual Thrust Position Monitor, operates as a dedicated hardware component for axial shaft position measurement within Bently Nevada 3300 Series machinery monitoring systems.

Hardware Specifications

Parameter	Specification
Model	79482-01
Brand	Bently Nevada
Product Type	Dual Thrust Position Monitor
Series	3300 Series
Origin	United States
Weight	2.8 kg
Dimensions	5.7 cm x 20.3 cm x 33.0 cm
Operating Temp	0 deg C to +65 deg C
Power Consumption	24 VDC transducer power supply
Voltage Compliance	0 to +12 VDC
Input Signal Range	+10.0 V to -24.0 V
Output Resistance	50 Ohm
Output Impedance	100 Ohm for voltage outputs
Extension Cable Capacitance	69.9 pF/m
Field Wiring Size	0.2 to 1.5 mm
Frequency Response	0 to 10 kHz
Minimum Target Size	15.2 mm

Eddy-Current Probe Scaling and Rotor Dynamics Monitoring

The Bently Nevada 79482-01 Dual Thrust Position Monitor processes eddy-current proximity probe signals to measure shaft axial displacement relative to the thrust bearing clearance. The monitor converts probe gap voltage variations into position data and evaluates thrust movement against configured alarm thresholds.

Additionally, the module supports dual-channel measurement architecture for thrust position applications. It allows two independent proximity probes to observe the same thrust collar or shaft position. Therefore, AND voting logic can reduce false alarm activation caused by individual probe failures or abnormal gap voltage conditions.

The system evaluates gap voltage conditions because incorrect probe operation can appear as mechanical movement. For Bently Nevada proximity measurement systems, a gap voltage validation process commonly references -10 VDC target conditions to confirm proper probe operating range and signal integrity.

Frequently Asked Questions

Q: How does the 79482-01 measure thrust position?
A: The 79482-01 uses eddy-current proximity probe inputs to measure the axial displacement of a rotating shaft. It analyzes the probe gap voltage signal and converts the measurement into thrust position data.

Q: Can the monitor operate with a single proximity probe?
A: The monitor can support single-channel configurations; however, dual-probe installation with AND voting logic is recommended for thrust position applications to reduce false trips caused by transducer faults.

Q: What type of signal processing does the monitor provide?
A: The monitor processes two independent axial position channels, applies alarm logic, and provides voltage output signals for integration with machinery protection systems.

Field Installation Guidelines

Install the 79482-01 monitor in accordance with the Bently Nevada 3300 Series rack configuration requirements. Verify that proximity probes are positioned toward the thrust collar or shaft target surface to obtain direct axial displacement measurements.

Route probe extension cables separately from high-voltage power wiring to minimize electrical interference. Maintain proper cable shielding and connect shields according to the system grounding practice.

Before operation, verify probe gap voltage, input signal range, and channel response. Confirm that both thrust position channels provide stable measurements before enabling alarm or shutdown logic.

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