Product Introduction
The Bently Nevada 3500/42M (Part Number 176449-01) is a 4‑Channel Displacement / Velocity / Acceleration Monitor from the 3500 Series machinery protection system. The “M” designation indicates an enhanced version with improved signal processing, additional diagnostic capabilities, and expanded input flexibility compared to the standard 3500/42. This monitor accepts inputs from proximity probes (eddy‑current), seismic accelerometers, and velocity transducers. It conditions these signals to provide continuous, real‑time monitoring of radial vibration, axial (thrust) position, eccentricity, and acceleration on critical rotating machinery. The 176449-01 variant typically includes isolated inputs, programmable signal conditioning (peak‑to‑peak, zero‑to‑peak, RMS), and advanced alarm logic (Alert and Danger per channel). The module communicates with other 3500 rack components via the internal backplane and occupies one full‑height slot.
Parameters
| Parameter | Specification |
|---|---|
| Model / Part Number | 3500/42M 176449-01 |
| Product Type | 4‑Channel Displacement / Velocity / Acceleration Monitor (Enhanced) |
| Number of Input Channels | 4 (independent, configurable) |
| Input Types | Proximity probe (3300 XL), seismic accelerometer (IEPE), velocity transducer |
| Signal Processing | Peak‑to‑peak, zero‑to‑peak, RMS, programmable per channel |
| Alarm Outputs | Alert and Danger per channel (programmable, via backplane to relay modules) |
| Recorder Outputs | 4 channels (4‑20 mA, isolated) |
| Buffered Outputs | BNC on front panel (dynamic transducer signal) |
| Frequency Response (proximity) | 0 to 10 kHz |
| Frequency Response (seismic) | 0.5 Hz to 10 kHz (depending on sensor) |
| 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 |
| Input Impedance (proximity) | 10 kΩ |
| Isolation | 1500 Vrms channel‑to‑channel and channel‑to‑ground |
| Certifications (typical) | CSA, ATEX, IECEx (for safe area rack installation) |
Application Scenarios
Radial Vibration Monitoring on Turbomachinery – Installed on steam turbines, gas turbines, and centrifugal compressors in power plants and refineries to measure shaft‑relative vibration (using proximity probes) and casing vibration (using accelerometers). Detects imbalance, misalignment, bearing wear, and rubs.
Axial (Thrust) Position Measurement – Monitors rotor displacement on compressors, turbines, and large pumps to prevent thrust bearing overload and rotor‑stator contact. The enhanced “M” version provides faster response and more precise setpoints.
Shaft Eccentricity and Differential Expansion – Used during machine startup and coast‑down on generators and large turbines to measure shaft bow and thermal growth, enabling safe passage through critical speeds.
Multi‑Parameter Protection in Hazardous Areas – The isolated inputs and robust design allow simultaneous connection of proximity probes (for shaft motion) and accelerometers (for casing vibration) on the same machine, e.g., in oil & gas offshore platforms.
Integration with 3500 Series Systems – Works seamlessly with 3500/32 relay modules for trip logic, 3500/22 TDI for transient data capture, and 3500/15 power supplies. The 4‑20 mA recorder outputs interface directly with plant DCS or PLC for trending and alarming.
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Quality Commitment
Each product has been tested by our technicians, providing 12-month long warranty, worry-free after-sales
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- Bulk order enjoys Friendship discount (2 pieces or more can be applied)
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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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