Product Description

Overview

The Bently Nevada 125680-01 is a high-precision Proximitor I/O module designed for the 3300 series proximity monitoring systems. It converts the eddy-current sensor signals from proximity transducers into linear DC voltage outputs, enabling accurate measurement of machinery vibration and shaft position. The -01 version is configured for panel mounting, suitable for DIN rail or flat panel installation in control enclosures.

This module is a critical component for machinery protection, providing continuous monitoring and alarm signaling to ensure operational safety and maintenance efficiency.

Key Functions

• Converts complex probe impedance changes into linear DC signals

• Measures radial vibration and axial position of rotating machinery

• Provides Keyphasor output for speed and phase reference

• Supports up to four channels when integrated with 3500/4oM monitors

• Enables user-programmable alert and danger setpoints via 3500 Rack Configuration Software

Technical Specifications

Electrical & Signal Characteristics

• Scale Factor: 7.87 V/mm (200 mV/mil)

• Linear Range: 0.25 – 2.3 mm (10 – 90 mils)

• Output: Negative DC voltage proportional to probe-target gap

• Dynamic Response: 0 Hz (DC) to 10 kHz

• Power Supply: -24 VDC (standard industrial vibration system)

• Isolation: Circuit isolated from housing to prevent ground loop interference

Mechanical & Environmental

• Mounting: Panel Mount (Option -01)

• Housing: Rugged aluminum enclosure

• Connectors: Gold-plated coaxial for probe and terminal block for monitor output

• Dimensions: 2.5 x 11.2 x 24.2 cm

• Weight: 0.38 kg

• Operating Temperature: -35°C to +85°C

• Country of Manufacture: United States

System Compatibility

• Works with 3300 5mm & 8mm Proximity Transducers

• Fully compatible with 3300 XL and 3500/4oM monitor series

Applications

• Turbomachinery vibration monitoring

• Thrust and axial position detection in rotating equipment

• Shaft speed and phase reference via Keyphasor signal

• Critical industrial machinery where high reliability is required

FAQ

Q: What is the function of Bently Nevada 125680-01?
A: It is a Proximitor I/O module that converts proximity sensor signals into linear voltage for vibration and position monitoring.

Q: Can this module measure axial position?
A: Yes, it provides both radial vibration and axial (thrust) position measurements.

Q: What does the -01 option signify?
A: The -01 denotes the panel mount version designed for DIN rail or flat mounting.

Q: How is the module calibrated?
A: Factory-calibrated for AISI 4140 steel. If used with other shaft materials, scale factor adjustment may be required.

Specification Summary Table