Introduction
The 3500/40M 176449-01 + 135489-04 is a high-channel-density monitoring assembly within the Bently Nevada 3500 System, designed for four-channel vibration or position monitoring. This specific configuration combines a four-channel power supply and buffer module (176449-01) with a four-channel monitor module (135489-04). It is engineered to efficiently monitor multiple measurement points (such as radial vibration on several bearings or axial position) from eddy-current proximity probes using a compact, two-module footprint. This solution optimizes rack space while providing comprehensive protection for critical machinery.
Key Parameters
The following table summarizes the key technical and physical specifications for this module assembly.
| Parameter Category | Specification |
|---|---|
| Model / Assembly | 3500/40M Four-Channel Monitor (176449-01 + 135489-04) |
| Primary Function | Four independent channels for radial vibration, axial position, differential expansion, or eccentricity monitoring. |
| Input Channels | Four independent inputs for standard eddy-current proximity probes (e.g., 5 mm, 8 mm, 11 mm). |
| Key Measurements per Channel | • Dynamic Vibration (AC, peak-to-peak) • Average/Gap Voltage (DC) for position • Programmable Alert and Danger Alarms for both AC and DC values. |
| Probe Power Supply | Provides regulated -24 VDC excitation for all four connected proximity probes (via 176449-01). |
| System Power | Powered from the 3500 rack backplane (+24 VDC). |
| Operating Temperature | -30°C to +65°C (standard for 3500 series). |
| Dimensions (per Module, H x W x D) | Standard 3500 Series Module Size: 190 mm (H) x 50 mm (W) x 170 mm (D) Note: This assembly requires two adjacent slots in a 3500 rack. |
| Weight (Total Assembly) | Approx. 1.2 kg - 1.6 kg (combined weight of both modules). |
| Mounting | Modules are installed in adjacent slots of a 3500 rack or frame. |
*Note: The specific firmware revision (-04) on the monitor module defines its exact features and compatibility. The 3500/40M framework is highly flexible, and each channel can be individually configured for its specific measurement type. Always consult the official Bently Nevada 3500/40M Framework documentation for configuration guidelines.*
Application Scenarios
This four-channel assembly is ideal for applications requiring efficient monitoring of multiple measurement points on a single machine or across several smaller machines from a single rack slot pair.
Complete Bearing Monitoring on a Single Machine:
Efficiently monitors both radial vibration channels (X & Y) on two different journal bearings of a turbine, compressor, or large pump, providing full protection for two critical points with one assembly.
Multi-Point Axial Position & Thrust Monitoring:
Can be configured to monitor dual thrust bearing positions or a combination of axial position and differential expansion on a steam turbine, protecting against catastrophic thrust bearing failure.
Compact Monitoring for Multiple Small Machines:
In applications with several critical pumps, fans, or motors, a single 3500/40M assembly can monitor the primary vibration point on four separate machines, offering a cost- and space-efficient protection solution.
Combined Vibration and Position on a Single Casing:
A typical configuration might use two channels for radial vibration (X & Y) on a compressor's inboard bearing, one channel for axial position, and one channel for radial vibration on an outboard bearing or an attached gearbox.
Industry-Wide Application:
Power Generation: Ideal for monitoring multiple bearings on smaller steam turbines, generators, and large boiler feed pumps.
Oil & Gas: Used on multi-stage compressors and pipeline pumps to monitor several casing points.
Water & Wastewater: Provides centralized protection for multiple critical pumps and blowers in a treatment facility.
Industrial Manufacturing: Protects critical machine tool spindles, large extruders, or rolling mill drives where multiple points need monitoring.
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