Introduction
The Bently Nevada 3500/25 126648-02 is a specific hardware revision of the 3500/25 Four-Channel Vibration Monitor, a core component within the GE Bently Nevada 3500 Machinery Protection System. This module is designed for the continuous monitoring and protection of critical rotating machinery by measuring relative shaft vibration via non-contact eddy current proximity probes.
Its primary function is to accept signals from four independent proximity probes (typically 8 mm) mounted near a machine's bearings. It processes these signals to determine the dynamic vibration (amplitude) and static position (DC gap) of the shaft. The module provides both continuous monitoring for operational trending and immediate, safety-critical protection by triggering alarms and shutdowns if vibration levels exceed pre-defined setpoints. This is essential for detecting common machinery faults such as unbalance, misalignment, shaft cracks, and bearing issues before they lead to catastrophic failure.
Parameters / Specifications
The key technical specifications for the Bently Nevada 3500/25 126648-02 are summarized in the table below.
| Parameter | Specification |
|---|---|
| Part Number | 3500/25 126648-02 |
| Product Line | GE Bently Nevada 3500 System |
| Module Type | Four-Channel Vibration Monitor (Relative Shaft Vibration) |
| Number of Channels | 4 (independent) |
| Sensor Input | Accepts signals from eddy current proximity probes (e.g., 8 mm). Requires an external -24 V DC proximitor power source or a 3500/15 Power Supply module in the rack. |
| Measured Parameters | Dynamic Vibration (peak-to-peak, in µm or mils), Static Position (DC Gap, in volts), and Gap Voltage. |
| Frequency Response | 4 Hz to 4 kHz (240 RPM to 240,000 RPM) |
| Setpoints | 2 programmable setpoints per channel (Alert and Danger) with dedicated relay outputs. |
| Dynamic Range | 0 to 400 µm (0 to 16 mils) peak-to-peak (standard range) |
| Power Supply | Derived from the 3500 Rack |
| Communication | Via the rack's backplane with the 3500/92 Communication Module |
| Dimensions (H x W) | Standard 3500 Series Module (Approx. 3.9" x 8.7" or 99 mm x 221 mm) |
| Weight (Approx.) | 1.1 lbs (0.5 kg) |
| Operating Temperature | 0°C to +65°C (+32°F to +149°F) |
Application Scenarios
The 3500/25 Vibration Monitor is a workhorse for machinery protection across numerous industries, deployed wherever measuring shaft relative vibration is critical for asset health and safety.
Typical application scenarios include:
Turbine and Compressor Bearing Monitoring:
The primary application. Mounting two probes per bearing (X and Y direction) on steam turbines, gas turbines, and centrifugal compressors to monitor radial shaft vibration. A sudden or progressive increase in vibration will trigger an alarm or a safe shutdown to prevent damage.
Early Fault Detection and Diagnostics:
Continuously monitoring vibration trends to detect developing issues like rotor unbalance, misalignment, oil whirl, and rubbing parts. This enables predictive maintenance, allowing repairs to be scheduled before a failure occurs.
Integration with Machinery Protection Systems:
Serving as a key input to a larger control and safety system. The module's relay outputs can be wired to a central DCS/PLC or through a 3500/33 Relay Module to initiate unit shutdown, activate annunciator panels, or start auxiliary systems.
Shaft Position Monitoring:
Using the DC gap voltage output to monitor the average position of the shaft within the bearing clearance, which can indicate load changes or potential problems.
Industries of Use:
Power Generation (Gas, Steam, and Hydro Turbines)
Oil & Gas (Pipeline Compressors, Gas Turbines, Pumps)
Petrochemical & Refining
Marine Propulsion
Global direct procurement guarantee
All products are purchased directly from overseas original manufacturers or authorized channels, 100% guaranteed genuine quality, sufficient spot inventory, and comprehensive model coverage
Quality Commitment
Each product has been tested by our technicians, providing 12-month long warranty, worry-free after-sales
Flexible procurement plan
- Bulk order enjoys Friendship discount (2 pieces or more can be applied)
- Long-term cooperative customers can apply for priority supply
Full service support
7×24 hours technical consultation, from selection guidance to installation and commissioning to provide full life cycle service (paid)
Why do so many customers choose us?
On the basis of the same quality, we provide:
- More competitive price system
- Faster logistics response
- More complete technical support (free product technical documentation)
Your trust is the driving force for our continuous progress, submit your requirements immediately to get exclusive quotes
