The Bently Nevada 3500/42-02-01 is a key part of the 3500 Series. This Proximitor Seismic Monitor accepts up to four transducer signals. It supports proximity, velocity, or acceleration inputs. The module provides continuous machinery protection. You can use it for radial vibration, thrust, or eccentricity measurements. This version includes the 128240-01 I/O module. It uses external terminations for easy wiring.

Technical Specifications

Input Characteristics

• Signal Inputs: Accepts 1 to 4 transducer signals. These include proximity, velocity, or acceleration.

• Input Impedance: Standard I/O provides 10 kΩ for Proximitor and acceleration inputs.

• Power Consumption: The module consumes 7.7 watts typical.

Sensitivity Ranges

• Radial Vibration: Choose 3.94 mV/μm (100 mV/mil) or 7.87 mV/μm (200 mV/mil).

• Thrust: Same options at 3.94 mV/μm or 7.87 mV/μm.

• Differential Expansion: Select 0.394 mV/μm (10 mV/mil) or 0.787 mV/μm (20 mV/mil).

• Acceleration: Fixed at 10 mV/(m/s²) which equals 100 mV/g.

• Velocity: Options include 20 mV/(mm/s) pk or 4 mV/(mm/s) pk.

Output and Interface Details

• Front Panel LEDs: OK LED shows normal operation. TX/RX LED indicates rack communication. Bypass LED shows bypass mode.

• Buffered Outputs: Each channel has a coaxial connector. These are short-circuit protected.

• Output Impedance: Standard outputs use 550 Ω. Shaft absolute outputs use 300 Ω.

• Recorder Output: Provides +4 to +20 mA proportional to full-scale. Load resistance ranges 0 to 600 Ω.

• Resolution: 0.3662 µA per bit with ±0.25% error at room temperature.

Environmental and Power

• Transducer Power Supply: Provides -24 Vdc for connected sensors.

• Temperature Range: Full accuracy from 0 to +65°C.

• Hazardous Area Approval: Option 01 = cNRTLus for Class 1, Division 2.

Installation Guide

Follow these steps to install the Bently Nevada 3500/42-02-01.

1. Ensure the 3500 rack is powered off.

2. Insert the module into the designated slot.

3. Secure the module with the front panel screws.

4. Connect external terminations to the 128240-01 I/O module.

5. Wire each transducer to the correct channel.

6. Power on the rack and verify the OK LED is lit.

Package List

• 1 x Bently Nevada 3500/42-02-01 Proximitor Seismic Monitor

• 1 x 128240-01 I/O Module with external terminations

• 1 x Front panel connector kit

• 1 x Installation manual

Common FAQs

Q1: What types of sensors work with the 3500/42-02-01?
A: It accepts proximity probes, velocity sensors, and accelerometers. Seismoprobe and Velomitor are supported but not recommended.

Q2: How many channels does this Bently Nevada 3500/42-02-01 support?
A: This monitor supports up to four independent input channels. Each channel has its own buffered output.

Q3: Can I use this module in a hazardous area?
A: Yes, the 3500/42-02-01 has the 01 approval option. It is cNRTLus certified for Class 1, Division 2 locations.

Q4: What happens if a recorder output shorts?
A: Short circuits on recorder outputs do not affect monitor operation. The outputs are fully protected.

Q5: How do I know if the module is working?
A: Check the green OK LED on the front panel. A lit OK LED means the Bently Nevada 3500/42-02-01 is operating properly.