Introduction
The assembly 3500/33 149992-03 is a Velocity/Acceleration Monitor and its associated Input/Processor Card for the Bently Nevada 3500 Machinery Protection System. The 3500/33 is a specialized monitor chassis designed to process signals from seismic transducers that measure casing or absolute vibration. The 149992-03 is the specific, field-replaceable card that provides the signal conditioning and processing for these inputs. This assembly is dedicated to monitoring vibration expressed as velocity (e.g., mm/s) or acceleration (g), making it ideal for protecting a wide range of machinery based on overall casing vibration levels.
Parameters / Specifications
The following table outlines the key technical parameters for this vibration monitoring assembly.
| Parameter | Specification |
|---|---|
| Assembly Designation | 3500/33 (Monitor) & 149992-03 (Processor Card) |
| Description | Velocity/Acceleration Monitor Assembly |
| Monitor: 3500/33 | |
| Physical Dimensions (H x W x D) | Approx. 190 mm x 40 mm x 120 mm (Standard 3500 Series frame slot) |
| Weight (Monitor) | Approx. 0.5 kg (1.1 lb) |
| Primary Function | Dedicated Monitor for Casing Vibration (Velocity/Acceleration) |
| Input Channels | Typically 2 or 4 channels (configurable) |
| Power Supply | Powered by the 3500 rack. |
| Operating Temperature | 0°C to +65°C (32°F to 149°F) |
| Processor Card: 149992-03 | |
| Description | Velocity/Acceleration Input & Processor Card |
| Physical Dimensions | A plug-in card designed for the 3500/33 chassis. |
| Weight (Card) | Approx. 0.15 kg (0.33 lb) |
| Compatible Inputs | Seismic Velocity Transducers, ICP®/IEPE Accelerometers |
| Measurement | Casing Vibration (Velocity or Acceleration) |
| Standard Velocity Range | Configurable, e.g., 0-25.4 mm/s (0-1.0 in/s) peak |
| Frequency Response | As defined by the connected transducer and card configuration (e.g., 4.5 Hz to 1 kHz for velocity) |
| Total Assembly Weight | Approx. 0.65 kg (1.43 lb) |
*Note: The specific configuration, including the type of measurement (velocity or acceleration), input type (velocity coil or accelerometer), number of active channels, and alarm setpoints, is defined by the system's software setup and the capabilities of the 149992-03 card.*
Application Scenarios
This vibration monitoring assembly is crucial for protecting machinery based on the absolute vibration of the machine casing or structure.
Motor and Pump Casing Vibration Monitoring:
The primary application is monitoring the bearing housing vibration of motors, pumps, fans, and blowers. The velocity input is ideal for detecting overall vibration severity caused by imbalance, misalignment, and looseness.
Turbine Casing Vibration Monitoring:
Used to monitor the absolute vibration of steam and gas turbine casings and foundations. This provides crucial data on the overall mechanical health of the turbine structure, complementing shaft vibration measurements.
API 670 Compliant Machinery Protection:
Serves as the monitoring and alarm unit for casing vibration channels in a machinery protection system designed to meet API 670 standards, ensuring reliable and standardized protection for critical assets.
General Purpose Machinery Protection:
Deployed in 3500 racks to provide reliable casing vibration monitoring for hundreds of machines in a plant, feeding data and alarms directly to the plant's DCS for operator awareness and alarm management.
High-Frequency Bearing Fault Detection:
When configured for acceleration input from accelerometers, this assembly can be used for detecting high-frequency vibrations associated with rolling element bearing defects, enabling early warning of bearing degradation.
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