Product Overview
The Bently Nevada 133442-01 is the dedicated I/O (backplane) module that completes the Bently Nevada 3500/50 Tachometer / Speed Monitoring assembly, forming the rear-half interface behind the 3500/50 front-plate module (commonly paired with part number 288062-02). As a core component of the renowned Bently Nevada 3500 Series Machinery Protection and Condition Monitoring platform, this I/O module is purpose-built to receive raw pulse signals from eddy-current proximity probes (Keyphasor® style) or magnetic (reluctance) pickups mounted on turbines, generators, compressors, pumps, and other critical rotating assets.
Within the 3500/50 dual-channel tachometer configuration, the Bently Nevada 133442-01 conditions and routes these sensor inputs to the front module, where shaft speed (RPM), rotor acceleration, and rotational direction are accurately computed and compared against user-programmable alarm setpoints. Its internal-terminal design simplifies field wiring while maintaining signal integrity in electrically noisy industrial environments. Compliant with API 670 requirements for machinery protection systems, the Bently Nevada 133442-01 plays a vital role in overspeed detection, zero-speed confirmation, and rotor dynamics analysis—making it indispensable for safeguarding high-value, high-consequence rotating equipment.
Engineered for seamless integration into the 3500 rack architecture, the module supports hot-swappable replacement, redundant power configurations, and flexible software-based configuration through Bently Nevada’s proprietary setup tools. Whether deployed in power generation, oil & gas, petrochemical, or heavy manufacturing, the 133442-01 delivers the reliability and precision that plant engineers depend on for continuous, unattended machinery protection.
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 133442-01 |
| Manufacturer | Bently Nevada (a Baker Hughes business) |
| Product Type | Tachometer I/O Module (Backplane, with Internal Terminals) |
| Series / Platform | 3500 Series / 3500/50 Dual-Channel Tachometer Module |
| Compatible Front Module | 3500/50 (e.g., 288062-02) |
| Input Signal Type | Eddy-current sensor or Magnetic (reluctance) pickup pulse |
| Input Signal Range | +10.0 V to −24.0 V (internally limited beyond range) |
| Input Impedance | 20 kΩ (standard); 40 kΩ (TMR); 7.15 kΩ (internal barrier) |
| Number of Channels | 2 (dual-channel, supports redundancy & direction sensing) |
| Typical Power Consumption | 5.8 W |
| Supported Sensors | 3300 5 mm / 8 mm, 3300 16 mm HTPS, 7200 5/8/11/14 mm, 3300 RAM, magnetic pickups |
| Termination Style | Internal terminals (external-terminal & barrier variants available) |
| Compliance | API 670 (machinery protection system standard) |
| Operating Temperature | 0 °C to +65 °C (rack environment) |
| Hot-Swap Capable | Yes (with redundant power supply recommended) |
| Mounting | 3500 rack backplane slot |
Main Features and Advantages
Dual-channel architecture for superior reliability: The Bently Nevada 133442-01 supports two independent sensor inputs, enabling true redundancy and the ability to determine rotational direction when paired with a second pickup. This dual-channel design is essential for detecting reversed rotation and for achieving the high availability required in turbine and compressor overspeed protection schemes.
Broad sensor compatibility: The module accepts signals from the full range of Bently Nevada eddy-current transducers—including 3300 5 mm, 8 mm, and 16 mm HTPS probes, 7200-series sensors, 3300 RAM probes, as well as standard magnetic pickups. This flexibility allows the Bently Nevada 133442-01 to integrate seamlessly into both new installations and legacy machinery upgrades without requiring sensor changes.
Precision measurement and fast response: Working in concert with the 3500/50 front module, the I/O stage delivers accurate RPM, acceleration, and direction data with high resolution and sub-10 ms alarm response. Programmable Alert and Danger setpoints (configurable across 0–100 % of full scale with adjustable time delays) ensure that operators are warned well before unsafe conditions develop.
Internal-terminal, clean wiring design: Unlike external-terminal variants, the Bently Nevada 133442-01 uses internal termination, reducing cabinet wiring complexity, minimizing signal-noise pickup, and streamlining panel layout. The design also supports optional internal intrinsically safe (IS) barriers for hazardous-area installations.
Seamless 3500 ecosystem integration: The module slots directly into the 3500 rack and communicates over the backplane without additional cabling. Hot-swappable operation—when the rack is equipped with redundant power supplies—means replacement can occur without taking the protection system offline, dramatically reducing maintenance downtime.
API 670 compliance and proven heritage: Engineered to the stringent requirements of API 670 for mechanical protection systems, the Bently Nevada 133442-01 inherits decades of Bently Nevada field-proven expertise in rotating-machinery asset protection, giving end users confidence in the most demanding applications.
