Product Introduction
The Bently Nevada 3500/50M (Part Number 133388-02) is an Enhanced Speed Monitor Module for the 3500 Series machinery protection system. It is designed to measure rotational speed, overspeed, underspeed, zero speed, and reverse rotation on critical rotating machinery. The “M” designation indicates an enhanced version with improved measurement accuracy, additional programmable setpoints, and advanced diagnostics compared to the standard 3500/50. The monitor accepts inputs from magnetic pickups (MPUs), proximity probes (eddy‑current), or variable reluctance sensors, and provides configurable alarm and trip outputs (Alert, Danger, Overspeed). The 133388-02 variant typically includes two independent speed input channels with high‑speed comparison logic. The module occupies one full‑height slot in a 3500 rack.
Parameters
| Parameter | Specification |
|---|---|
| Model / Part Number | 3500/50M 133388-02 |
| Product Type | Enhanced Speed Monitor Module |
| Number of Input Channels | 2 (independent, configurable) |
| Input Types | Magnetic pickup (MPU), proximity probe (3300 XL), variable reluctance sensor |
| Speed Measurement Range | 0 to 600,000 rpm (depending on sensor and gear teeth) |
| Overspeed Response Time | < 100 ms (typical) |
| Programmable Setpoints | Overspeed, underspeed, zero speed, reverse rotation |
| Outputs (via backplane) | Alarm and trip signals to relay modules |
| Buffered Outputs | BNC on front panel (sensor signal) |
| 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 reading |
| Input Frequency Range | 0.5 Hz to 20 kHz |
| Certifications (typical) | CSA, ATEX, IECEx (for safe area rack installation) |
Application Scenarios
Overspeed Protection for Turbomachinery – Installed on steam turbines, gas turbines, and centrifugal compressors in power plants and refineries. The module provides ultra‑fast overspeed detection and trips the machine via 3500/32 relay modules to prevent catastrophic rotor overspeed.
Underspeed and Zero Speed Monitoring – Used on large pumps, fans, and blowers to detect motor stall, belt breakage, or shaft seizure, triggering alarms or automatic start of backup equipment.
Reverse Rotation Detection – Critical for reciprocating compressors, pumps, and certain turbines where reverse rotation can cause severe damage. The module detects reverse direction and initiates immediate shutdown.
Speed Control and Synchronization – Provides accurate speed feedback to plant DCS or governor systems for starting, loading, and synchronizing turbomachinery with electrical grids or process trains.
Redundant Speed Monitoring – Two independent input channels can be configured in a 1‑out‑of‑2 or 2‑out‑of‑2 voting arrangement, ensuring high availability for overspeed protection in nuclear plants, offshore platforms, and other safety‑critical environments.
Coast‑Down and Startup Analysis – The enhanced speed measurement precision supports transient analysis (e.g., Bode plots, waterfall diagrams) when combined with 3500/22 TDI modules, helping engineers identify critical speeds and resonances.
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Each product has been tested by our technicians, providing 12-month long warranty, worry-free after-sales
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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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