Product Brief: Bently Nevada 3500/42-04-01 (4-Channel Proximitor Monitor)
The 3500/42-04-01 is a 4-channel Proximitor Monitor within the Bently Nevada 3500 series machinery protection system. This specific version (04-01) is designed to accept eddy current proximity probe inputs (typically Bently Nevada 3300, 3300 XL, or 7200 series) and provides continuous monitoring of radial vibration, axial (thrust) position, eccentricity, and differential expansion on critical rotating machinery.
The monitor outputs conditioned Keyphasor tracking signals to the backplane, supports voting logic for alarms/trips, and communicates with 3500 rack communication processors (e.g., 3500/20, 3500/22) for integration with DCS/PLC systems.
Key Features
4 independent proximity probe input channels.
Accepts Bently Nevada Proximitor sensors (output -0.8 V to -22 VDC).
Configurable for radial vibration, axial position, eccentricity, or differential expansion measurements.
Programmable scaling, alarm setpoints (Alert/Danger), and time delays.
Provides backplane Keyphasor tracking for synchronous vibration analysis.
Supports analog outputs (via 3500/32 relay module) and digital communication.
Redundant power supply compatible.
Parameters (Table)
| Parameter | Specification |
|---|---|
| Model | 3500/42 |
| Configuration Code | 04-01 (Standard Proximitor Monitor, 4-channel, no special options) |
| Product Type | 4-channel Proximitor Monitor (eddy current probe input) |
| Dimensions (Height x Width x Depth) | 241 mm x 25 mm x 242 mm (9.5 in x 1.0 in x 9.5 in) – occupies one slot in 3500 rack |
| Weight (approx.) | 0.9 kg (2.0 lb) |
| Number of Input Channels | 4 independent channels |
| Input Sensor Type | Bently Nevada Proximitor (3300, 3300 XL, 7200 series) |
| Input Signal Range | -0.8 VDC to -22 VDC (proportional to gap) |
| Measurement Types | Radial Vibration (displacement pk-pk), Axial Position (gap DC), Eccentricity (low speed), Differential Expansion |
| Frequency Response | 0 to 10 kHz (-3 dB) |
| DC Drift (Temperature) | < ±1.0% of full scale per 40°C |
| Accuracy | ±0.5% of full scale at reference temperature (22°C) |
| Alarm Outputs | 2 per channel (Alert & Danger) – requires 3500/32 relay module for physical output |
| Backplane Outputs | Buffered raw probe signal (BUF), Keyphasor tracking, processed data |
| Communication | Via 3500 rack interface (3500/20, 3500/22) to proprietary or Modbus Gateway |
| Operating Temperature | -30°C to +65°C (-22°F to +149°F) |
| Storage Temperature | -40°C to +85°C (-40°F to +185°F) |
| Power Consumption | 6.2 W (typical from rack backplane) |
| Conformal Coating | Standard (suitable for moderate industrial environments) |
Application Scenarios (use cases)
| Application Area | Description |
|---|---|
| Steam Turbine Radial Vibration | Monitors shaft relative vibration at each bearing (4 channels per monitor) for early detection of unbalance, misalignment, or rub. |
| Gas Turbine Axial Position (Thrust) | Measures thrust bearing wear and axial movement to prevent rotor-stator contact. |
| Centrifugal Compressor Shaft Vibration | Critical for oil & gas compressors; 4-channel monitor covers both radial probes and axial position in one module. |
| Generator Rotor Vibration | Monitors vibration at both ends of generator (2 probes per end) using 4 channels. |
| Steam Turbine Eccentricity (Slow roll) | Measures rotor bow during startup or cooldown; requires low-speed Keyphasor input. |
| Hydro Turbine Differential Expansion | Monitors relative expansion between rotor and stator in large hydro units (custom configuration). |
| Turboexpander Train (LNG / Refinery) | Combines radial vibration and axial position monitoring in a single 3500 slot, saving rack space. |
| Blast Furnace Blower (Steel plant) | 4-channel monitor covers both high-speed shaft vibration and anti-surge control feedback. |
Notes
Configuration code 04-01 is the standard version with basic proximity probe inputs. Some optional versions include internal isolation barriers (e.g., for hazardous areas) – code would differ.
Requires field termination module (e.g., 3500/42M) or separate terminal blocks for probe connections (sold separately).
Keyphasor reference signal must be provided by a 3500/25 Keyphasor Module installed elsewhere in the rack.
For radial vibration monitoring, typically two probes per bearing plane (X and Y orientation) are used; one 3500/42 covers one bearing (two probes) or two bearings (four probes if only one probe per bearing).
Configuration requires 3500 System Configuration Software and a communications processor.
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