Component Description
The part number 3500/22M 147364-01 refers to a specific module from the Bently Nevada 3500 System, a leading machinery protection and monitoring platform.
3500/22M: This designates a Dual-Channel Velocity Monitor Module. This module is specifically designed to process signals from velocity transducers (seismometers) that measure the casing or bearing housing vibration of machines. It conditions the input signal, computes the overall vibration level (in units like mm/s or in/s RMS), and compares this value to user-configurable alarm setpoints.
147364-01: This is a specific hardware revision or assembly number for this module.
In summary, the 3500/22M module is dedicated to monitoring relative-to-casing vibration for a wide range of machinery where the installation of proximity probes (which measure shaft relative vibration) is not feasible or is used to supplement the overall protection scheme. It provides critical alerts and shutdown signals to prevent machine damage.
Key Parameters
The following table outlines the key parameters for the 3500/22M Velocity Monitor module.
| Parameter | Specification |
|---|---|
| System | Bently Nevada 3500 |
| Primary Function | Casing Vibration Monitoring via Velocity Transducers |
| Channels | Two independent monitoring channels. |
| Input Type | Accepts signals from velocity transducers (seismometers). |
| Frequency Range | Typically from 4.5 Hz to 1000 Hz (or similar, depending on configuration). |
| Measurement | Processes the input to provide an overall vibration value, typically in mm/s RMS or in/s RMS. |
| Alarm Functions | Per channel: Two programmable alarm setpoints (usually Alert and Danger) with adjustable time delays. |
| Dynamic Signal Output | Buffered raw sensor signal for analysis by external systems (e.g., data collectors). |
| Mounting | Slides into a dedicated slot in a 3500 rack. |
| Dimensions (H x W x D) | Approx. 193 mm x 55 mm x 200 mm (7.6 in x 2.16 in x 7.87 in) |
| Weight | Approx. 0.6 kg (1.3 lbs) |
Application Scenarios
The 3500/22M Velocity Monitor is applied in scenarios where monitoring the absolute vibration of the machine's structure (casing/bearing housing) is essential for detecting unbalance, misalignment, or other mechanical faults.
Motor and Fan Monitoring:
Application: Large induction motors, forced-draft fans, and cooling tower fans.
Function: These machines often have rolling element bearings where shaft-relative vibration measurement with proximity probes is not practical. The 3500/22M directly monitors the casing vibration to detect unbalance, loose parts, or bearing defects, providing both alarm and shutdown functions.
Pump Casing Vibration:
Application: Vertical pumps, mixed-flow pumps, and other pumps with plain bearings where only casing vibration can be measured.
Function: Protects the pump by detecting cavitation, impeller wear, misalignment, and structural resonance issues by monitoring the vibration levels on the bearing housings.
Auxiliary Equipment Protection:
Application: Gearboxes, compressors, and other non-critical or slow-speed rotating equipment.
Function: Serves as a primary protection device for equipment where the cost of a full proximity probe system is not justified, but basic vibration protection is still required for safety and reliability.
Supplemental Monitoring:
Application: Steam turbines, gas turbines, and large compressors.
Function: Used alongside shaft-relative vibration monitors (like the 3500/42M) to provide a more comprehensive view of machine health. Casing vibration can sometimes detect certain faults, like blade passing issues or structural problems, that are not as visible in shaft vibration measurements.
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