Product Brief: Bently Nevada 3500/42M 140482-01 (4-Channel Proximitor Monitor with Internal Barriers)
The 3500/42M 140482-01 is a specialized version of the Bently Nevada 3500 series 4-channel Proximitor Monitor. It is designed for hazardous area applications (Class I, Division 1 or Zone 1/Zone 2) requiring intrinsically safe (IS) input barriers integrated directly into the monitor module. Each channel includes internal galvanic isolation and current-limiting barriers, allowing direct connection of eddy current proximity probes (e.g., Bently Nevada 3300 XL series) located in hazardous (explosive) atmospheres without external safety isolators.
The monitor provides continuous measurement of radial vibration, axial (thrust) position, eccentricity, and differential expansion on critical rotating machinery in hazardous areas.
Key Features
4 independent proximity probe inputs with internal IS barriers.
Certified for hazardous area sensors (Class I, Div 1 / Zone 1, IIB/IIC gas groups).
Accepts Bently Nevada Proximitor sensors (3300, 3300 XL series) via hazardous area wiring.
Programmable as vibration, position, eccentricity, or differential expansion monitor.
Provides backplane Keyphasor tracking for synchronous vibration analysis.
Outputs buffered probe signals (BUF) for external diagnostic use (non-hazardous side only).
Compatible with 3500 rack and redundant power supplies.
Parameters (Table)
| Parameter | Specification |
|---|---|
| Model | 3500/42M |
| Part Number | 140482-01 |
| Product Type | 4-channel proximity monitor with internal IS barriers |
| Dimensions (H x W x D) | 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.) | 0.95 kg (2.1 lb) |
| Number of Input Channels | 4 independent channels |
| Input Sensor Type | Bently Nevada Proximitor (3300, 3300 XL, 7200 series) – IS loop powered |
| Input Signal Range | -0.8 VDC to -22 VDC (gap voltage) |
| Input Protection | Intrinsic safety barriers (each channel) – galvanic isolation, current limiting |
| Hazardous Area Certification | Class I, Div 1 & 2 (Groups A-D); Zone 1/2 (IIB, IIC) |
| Entity Parameters (IS output per channel) | Voc ≤ 9.5 V, Isc ≤ 30 mA, Ca ≥ 0.1 µF, La ≥ 10 µH |
| Measurement Types | Radial vibration (pk-pk), axial position (DC gap), eccentricity, differential expansion |
| Frequency Response | 0 to 10 kHz (-3 dB) |
| Accuracy | ±0.5% of full scale at reference temperature (22°C) |
| Alarm Outputs | 2 per channel (Alert & Danger) – requires 3500/32 relay module |
| Backplane Outputs | Raw buffered probe signal (safe area BUF), Keyphasor tracking |
| Power Consumption | 7.5 W (typical) – higher due to barrier circuits |
| Operating Temperature | -20°C to +60°C (-4°F to +140°F) (reduced range due to IS barriers) |
| Storage Temperature | -40°C to +85°C (-40°F to +185°F) |
| Communication | Via 3500 rack interface (3500/20, 3500/22) to DCS/PLC |
Application Scenarios (use cases)
| Application Area | Description |
|---|---|
| Gas Turbine in Class I, Div 1 Compressor Building | Direct connection of proximity probes inside explosive gas environment without external safety barriers. |
| Offshore Platform (Zone 1 areas on a compressor skid) | Monitors shaft vibration and thrust position where explosive hydrocarbon atmospheres may exist. |
| Refinery Wet Gas Compressor (Zone 1) | Probes installed in compressor casing (Zone 1) connect directly to 3500/42M in safe area (rack in control room). |
| LNG Plant Cryogenic Compressor (Zone 1/2) | Internal barriers simplify wiring and reduce junction box complexity for hazardous area machinery. |
| Chemical Plant Compressor Train | Allows IS proximity probes in reactor gas recirculation compressors without adding external barrier isolators. |
| Flare Gas Recovery Compressor | Probes located in classified area; monitor module in safe rack eliminates need for separate barrier cabinets. |
| Upstream Oil & Gas Wellhead Compressor | Suitable for ISO Zone 1/2 applications where compact, integrated safety protection is required. |
| Hydrogen or Ethylene Compressor (IIC gas group) | Internal barriers certified for IIC (hydrogen/acetylene) highest gas group. |
Notes
140482-01 replaces older 3500/42M versions and includes improved barrier protection and certification updates.
Reduced operating temperature range (-20°C to +60°C) due to heat generated by barrier circuits – ensure adequate rack cooling.
Do NOT connect non-IS probes (e.g., standard 3300 XL without IS certification) – hazardous area certification invalidated.
Entity parameters must be matched to the specific Bently Nevada IS approved probe/cable system (refer to 3300 XL IS system manual).
Buffered outputs (BUF) are available on the termination module (safe area only) and are not intrinsically safe.
Requires 3500 rack with proper grounding and safe area power supply – consult hazardous area installation drawing.
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7×24 hours technical consultation, from selection guidance to installation and commissioning to provide full life cycle service (paid)
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