Product Overview
The Bently Nevada 3500/42-02-01 is a Proximitor Seismic Monitor designed for continuous vibration and position monitoring in rotating machinery. This industrial automation module accepts signals from up to four proximity, velocity, or acceleration transducers, making it a versatile choice for critical asset protection. With a typical power consumption of just 7.7 watts, it integrates efficiently into existing 3500 rack systems.
Part of the trusted Bently Nevada 3500 series, this module provides real-time data and alarms to help prevent unplanned downtime. Its hazardous area approval (cNRTLus, Class 1 Division 2) ensures safe operation in demanding environments.
Technical Specifications
Below are the key parameters for the 3500/42-02-01:
| Parameter |
Value |
| Input Channels |
1 to 4 proximity, velocity, or acceleration transducer signals |
| Power Consumption |
7.7 W typical |
| Input Impedance (Standard I/O) |
10 kΩ (Proximitor and acceleration inputs) |
| Radial Vibration Sensitivity |
3.94 mV/μm (100 mV/mil) or 7.87 mV/μm (200 mV/mil) |
| Thrust Sensitivity |
3.94 mV/μm (100 mV/mil) or 7.87 mV/μm (200 mV/mil) |
| Eccentricity Sensitivity |
3.94 mV/μm (100 mV/mil) or 7.87 mV/μm (200 mV/mil) |
| Differential Expansion Sensitivity |
0.394 mV/μm (10 mV/mil) or 0.787 mV/μm (20 mV/mil) |
| REBAM Sensitivity |
40 mV/μm (1000 mV/mil) or 80 mV/μm (2000 mV/mil) |
| Acceleration Sensitivity |
10 mV/(m/s²) (100 mV/g) |
| Velocity Sensitivity |
20 mV/(mm/s) pk (500 mV/(in/s) pk) or 5.8 mV/(mm/s) pk (145 mV/(in/s) pk) or 4 mV/(mm/s) pk (100 mV/(in/s) pk) |
| Shaft Absolute Radial Vibration |
3.94 mV/μm (100 mV/mil) or 7.87 mV/μm (200 mV/mil) |
| Shaft Absolute Direct |
3.94 mV/μm (100 mV/mil) or 7.87 mV/μm (200 mV/mil) |
| Shaft Absolute Velocity |
20 mV/(mm/s) pk (500 mV/(in/s) pk) or 5.8 mV/(mm/s) pk (145 mV/(in/s) pk) or 4 mV/(mm/s) pk (100 mV/(in/s) pk) |
| Buffered Output Impedance |
550 Ω |
| Transducer Power Supply |
-24 Vdc |
| Recorder Output |
+4 to +20 mA |
| Voltage Compliance |
0 to +12 Vdc across load |
| Load Resistance |
0 to 600 Ω |
| Recorder Resolution |
0.3662 µA per bit ±0.25% error at room temperature, ±0.7% over temperature range |
| Update Rate |
Approximately 100 ms or less |
| Shaft Absolute Output Impedance |
300 Ω |
| Hazardous Area Approval |
cNRTLus (Class 1, Division 2) |
Industry Applications
The 3500/42-02-01 excels in industries where machinery reliability is paramount. In power generation, it monitors turbine vibration and thrust to prevent catastrophic failures. In oil and gas, it tracks compressor health, reducing unplanned shutdowns. For pulp and paper, it oversees rotating equipment, extending maintenance intervals.
Because it accepts multiple transducer types, this module adapts to various monitoring needs—from radial vibration to differential expansion—making it a flexible choice for plant-wide protection.
Installation & Setup
When installing the 3500/42-02-01, ensure proper seating in the 3500 rack and connect external terminations per the I/O module type (128240-01). Use shielded cables for transducer inputs to minimize noise. Verify that the -24 Vdc transducer power supply meets the requirements of your sensors. After power-up, check the OK LED to confirm normal operation and the TX/RX LED for communication with other rack modules.
Maintenance & Reliability
Routine checks of the 3500/42-02-01 include verifying the front panel LEDs (OK, TX/RX, Bypass) for proper status. Inspect the coaxial connectors for damage or corrosion, as each buffered output is short-circuit protected but physical integrity matters. Keep the module free from dust and moisture to maintain accuracy. The recorder outputs are isolated from short circuits, adding to overall system robustness.
Selection Guide & Purchasing Advice
Before ordering, confirm your required I/O module type (02 for external terminations) and hazardous area approval (01 for cNRTLus). Ensure your 3500 rack has an available slot and that your transducer types are compatible with the sensitivities listed. For reliable sourcing, consider PLC Source PRO for genuine automation parts and expert support.