Product Description
The Bently Nevada 135489-02 I/O Module with Internal Barriers and Internal Terminations is an advanced component within the Bently Nevada 3500 Series Machinery Protection System. The Bently Nevada 135489-02 is specifically designed as a 4-channel input/output module that provides intrinsically safe interfaces for transducer systems, ensuring robust explosion protection in hazardous environments. Unlike the 135489-01 which typically handles four proximity/acceleration channels, the Bently Nevada 135489-02 variant is configured for two Proximitor/Acceleration channels and two Velomitor® channels. This versatility allows it to monitor a broader range of critical machinery parameters, including displacement, velocity, and acceleration. The Bently Nevada 135489-02 integrates seamlessly with the 3500 monitor, enabling continuous comparison of monitored parameters against configured alarm setpoints. Its internal barrier design offers a compact and rugged solution, streamlining installation and enhancing system safety and performance without the need for external barriers. The Bently Nevada 135489-02 module is a crucial element for comprehensive machinery health monitoring and protection.
Product Parameters
The Bently Nevada 135489-02 module offers key technical specifications tailored for its diverse monitoring capabilities:
| Parameter | Specification |
|---|---|
| Number of Channels | 4 |
| Channel Type | Isolated (2 Proximitor/Acceleration, 2 Velomitor) |
| Input Voltage Range | 8V to 24V DC (typical for transducers) |
| Proximitor/Acceleration Bandwidth | 30 kHz |
| Proximitor/Acceleration Amplitude Accuracy | 3% @ 10 kHz, -15/+10% @ 30 kHz |
| Proximitor/Acceleration Phase Accuracy | -11° @ 10 kHz |
| Velomitor® Amplitude Accuracy | ±1% |
| Operating Temperature | 0°C to +65°C (+32°F to +150°F) |
| Storage Temperature | -40°C to +85°C (-40°F to +185°F) |
| Humidity | 95%, non-condensing |
| Dimensions (HxWxD) | 241.3 mm x 24.4 mm x 163.1 mm (9.50 in. x 0.96 in. x 6.42 in.) |
| Weight | 0.46 kg (1.01 lb) |
| Isolation Voltage | 1500 VDC (for some variations) |
| Certifications | ATEX, IECEx, CSA/NRTL/C (for hazardous area approvals) |
Advantages and Features
The Bently Nevada 135489-02 module offers distinct advantages and features that set it apart in machinery protection systems:
- Dual Transducer Compatibility: A significant advantage of the Bently Nevada 135489-02 is its ability to accept inputs from both Proximitor/Acceleration and Velomitor® transducers, providing a versatile solution for monitoring various types of machine behavior within a single module. This reduces complexity and spare parts inventory.
- Integrated Intrinsic Safety: Like other internal barrier I/O modules, the Bently Nevada 135489-02 incorporates internal Zener barriers for intrinsically safe operation in hazardous classified areas. This eliminates the need for bulky and costly external barriers, simplifying wiring, reducing installation time, and maintaining the system’s performance.
- High Precision Monitoring: The Bently Nevada 135489-02 provides highly accurate measurements of displacement, velocity, and acceleration, critical for early detection of machinery faults such as imbalance, misalignment, bearing damage, and shaft cracks.
- Robust and Compact Design: The Bently Nevada 135489-02 is built to withstand harsh industrial environments, ensuring reliable performance and extended lifespan. Its compact design, while requiring a slightly deeper rack slot due to the internal barriers, simplifies physical installation compared to systems with external barrier arrays.
- API 670 Standard Compliance: The Bently Nevada 135489-02, when used with compatible Bently Nevada transducer systems, can help meet the requirements of API 670, a critical standard for machinery protection systems in industries like oil and gas.
Application Areas and Application Cases
The Bently Nevada 135489-02 I/O Module is ideally suited for critical applications requiring comprehensive machinery monitoring in hazardous locations.
- Petrochemical and Chemical Plants: Essential for safeguarding critical rotating machinery such as pumps, compressors, and turbines that operate in areas with flammable gases or vapors. The intrinsic safety of the Bently Nevada 135489-02 ensures safe operation.
- Oil and Gas Production and Refining: Used on offshore platforms, onshore production facilities, and refineries to monitor various machines including gas turbines, pipeline pumps, and reciprocating compressors, providing critical data for condition monitoring and predictive maintenance.
- Power Generation Facilities (Thermal, Nuclear, Hydroelectric): Applicable in areas where machinery operates in hazardous zones, monitoring large turbines, generators, and auxiliary equipment to prevent catastrophic failures and ensure continuous power supply.
- Pulp and Paper Industry: Employed to monitor fans, refiners, and other high-speed machinery in areas where explosive dusts or chemicals might be present.
Application Case: A major liquefied natural gas (LNG) plant utilized the Bently Nevada 135489-02 modules as part of their 3500 monitoring system for several large refrigerant compressors. These compressors were situated in a Class I, Division 2 hazardous area. The Bently Nevada 135489-02 modules, with their internal barriers, provided the necessary explosion protection, interfacing directly with both proximity probes for shaft vibration and Velomitor® sensors for casing vibration. This integrated approach allowed the plant to capture a comprehensive view of compressor health. During operation, the system detected abnormal vibration signatures on a specific compressor, indicating potential unbalance and incipient bearing wear. The data from the Bently Nevada 135489-02 enabled the plant to schedule a planned shutdown for rebalancing the rotor and replacing the bearings before a catastrophic failure occurred. This proactive maintenance, facilitated by the reliable data from the Bently Nevada 135489-02, saved millions in potential downtime and repair costs, while maintaining critical safety compliance.
