Product Introduction
The Bently Nevada 3500/42M (Part Number 125808-02) is a 4‑Channel Displacement / Velocity / Acceleration Monitor from the 3500 Series machinery protection system. The “M” designation indicates an enhanced version featuring additional monitoring capabilities and improved diagnostic functions compared to the standard 3500/42. This monitor accepts inputs from proximity probes (eddy‑current), seismic transducers (velocity), and accelerometers, and provides continuous, real‑time protection for critical rotating machinery.
The 125808-02 variant typically includes specific I/O options and firmware configurations optimized for high‑speed data processing and Modbus communication. The module conditions signals for radial vibration, axial position, eccentricity, and acceleration measurement, with programmable Alert and Danger alarm setpoints per channel. It communicates with other 3500 rack modules via the internal backplane and occupies one full‑height slot in a 3500 rack.
Parameters
| Parameter | Specification |
|---|---|
| Model / Part Number | 3500/42M 125808-02 |
| Product Type | 4‑Channel Displacement / Velocity / Acceleration Monitor (Enhanced) |
| Number of Input Channels | 4 (independent, configurable) |
| Input Types | Proximity probe (3300 XL), seismic accelerometer, velocity transducer |
| Signal Processing | Peak‑to‑peak, zero‑to‑peak, RMS (programmable per channel) |
| Alarm Outputs | Alert and Danger per channel (configurable) |
| Recorder Outputs | 4 channels (4‑20 mA) |
| Buffered Outputs | BNC front panel (transducer signal) per channel |
| Communication | Modbus RTU / TCP (via 3500 rack communication module) |
| Slot Width | 1 full‑height slot in 3500 rack |
| Dimensions (W × H × D) | 24.9 × 241.3 × 218.4 mm (0.98 × 9.50 × 8.60 in) |
| Weight | 0.45 kg (1.0 lb) |
| Operating Temperature | 0 to +65 °C (32 to +149 °F) |
| Storage Temperature | –40 to +85 °C (–40 to +185 °F) |
| Humidity | 5% to 95% non‑condensing |
| Accuracy | ±0.1% of full scale |
| Frequency Response (Proximity) | 0 to 10 kHz |
| Frequency Response (Seismic) | 0.5 Hz to 10 kHz (depending on transducer) |
| Certifications (typical) | CSA, ATEX, IECEx (for safe area rack installation) |
Application Scenarios
High‑Speed Turbomachinery Protection – Monitors radial vibration and thrust position on steam turbines, gas turbines, and centrifugal compressors in power plants and refineries, enabling early detection of imbalance, misalignment, and bearing faults.
Critical Pump and Compressor Monitoring – Provides continuous protection for large boiler feed pumps, pipeline compressors, and blowers where unplanned downtime has significant financial impact.
Shaft Eccentricity and Differential Expansion – Used during startup and coast‑down on large generators and turbines to measure shaft bow and thermal growth, preventing rotor‑stator rub.
Multi‑Parameter Measurement in Harsh Environments – Simultaneously accepts proximity probe, accelerometer, and velocity transducer inputs on the same machine (e.g., gas turbine with casing vibration and shaft relative vibration monitoring).
Integration with Plant DCS/PLC – The 4‑20 mA recorder outputs and Modbus communication allow seamless integration into existing control systems for alarming, trending, and predictive maintenance strategies in oil & gas, petrochemical, and power generation facilities.
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All products are purchased directly from overseas original manufacturers or authorized channels, 100% guaranteed genuine quality, sufficient spot inventory, and comprehensive model coverage
Quality Commitment
Each product has been tested by our technicians, providing 12-month long warranty, worry-free after-sales
Flexible procurement plan
- Bulk order enjoys Friendship discount (2 pieces or more can be applied)
- Long-term cooperative customers can apply for priority supply
Full service support
7×24 hours technical consultation, from selection guidance to installation and commissioning to provide full life cycle service (paid)
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- More competitive price system
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