Introduction
The Bently Nevada 3500/22M 288055-02 is a specific hardware revision of the 3500/22M TMR (Triple Modular Redundant) Speed Monitor, a highly advanced and safety-critical module within the GE Bently Nevada 3500 Machinery Protection System. This module is designed to provide the highest level of reliability and fault tolerance for overspeed protection, speed monitoring, and Keyphasor® generation.
This module utilizes three independent sensor inputs and three separate internal voting channels to monitor the rotational speed (RPM) of a shaft. It continuously compares all three signals to detect any discrepancies or failures in a single sensor or internal channel. Based on this robust, fault-tolerant input, it provides extremely reliable overspeed protection, underspeed detection, and zero-speed monitoring. The TMR architecture, using 2-out-of-3 (2oo3) voting logic, ensures that no single point of failure can prevent a necessary shutdown, making it essential for protecting expensive and safety-critical assets.
Parameters / Specifications
The key technical specifications for the Bently Nevada 3500/22M 288055-02 are summarized in the table below.
| Parameter | Specification |
|---|---|
| Part Number | 3500/22M 288055-02 |
| Product Line | GE Bently Nevada 3500 System |
| Module Type | TMR (Triple Modular Redundant) Speed Monitor |
| Key Function | Overspeed protection, speed monitoring, Keyphasor® generation |
| Architecture | Triple Modular Redundant (TMR) |
| Number of Sensor Inputs | 3 (Triple Redundant) |
| Sensor Input | Accepts passive magnetic pickups (MPUs), prox probes, or photocells |
| Speed Range | 0 to 9999 RPM (or equivalent frequency) |
| Keyphasor Output | Provides a once-per-revolution pulse for phase reference |
| Setpoints | 4 programmable setpoints (e.g., Overspeed Trip, Overspeed Alarm) |
| Voting Logic | 2oo3 (2-out-of-3) for trip outputs |
| Relay Outputs | 3 TMR Trip Outputs (Form C relays) |
| Power Supply | Derived from the 3500 Rack |
| Communication | Via the rack's backplane with the 3500/92 Communication Module |
| Dimensions (H x W) | Standard 3500 Series Module (Approx. 3.9" x 8.7" or 99 mm x 221 mm) |
| Weight (Approx.) | 1.3 lbs (0.59 kg) |
| Operating Temperature | 0°C to +65°C (+32°F to +149°F) |
Application Scenarios
The 3500/22M TMR Speed Monitor is deployed in the most critical applications where the highest level of safety and availability is required for speed-related protection.
Typical Application Scenarios:
Turbine Overspeed Protection:
Gas & Steam Turbines: The primary application, providing fault-tolerant overspeed protection through triple-redundant sensor inputs and 2-out-of-3 voting logic to prevent catastrophic turbine failure
Critical Machinery Protection:
Used on high-value compressors, pumps, and generators where reliable speed monitoring and protection are essential for operational safety and asset protection
Aircraft Derivative Turbines:
Essential for aeroderivative gas turbines which require the highest level of protection system integrity and fault tolerance
Safety-Critical Systems:
Applications where SIL (Safety Integrity Level) requirements mandate redundant architecture to achieve necessary safety ratings
Key Industries:
Power Generation (Combined Cycle, Peaking Plants)
Oil & Gas (Production, LNG, Pipelines)
Petrochemical & Refining
Marine Propulsion
The TMR architecture ensures both high availability (preventing unnecessary trips) and high safety (ensuring protection when needed), making this module suitable for the most demanding critical infrastructure applications.
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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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On the basis of the same quality, we provide:
- More competitive price system
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- More complete technical support (free product technical documentation)
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