Product Introduction: 3500/25 125800-01 + 149369-01
The 3500/25 125800-01 and 149369-01 together form a Radial Vibration (Proximitor® Driver) Module and Extension Cable kit for the Bently Nevada 3500 Machinery Protection System. The 3500/25 is the main monitoring module, which provides the necessary power and signal conditioning for eddy current proximity probes. The 149369-01 is a specialized extension cable used to connect the proximity probes to the monitoring system.
This system is designed to continuously monitor the radial vibration (or shaft relative vibration) of a machine's rotor. It measures the dynamic motion of the shaft relative to the bearing housing, which is a primary indicator of machine health, detecting issues such as unbalance, misalignment, and oil whirl.
Technical Parameters
The table below outlines the key parameters for both the module and the cable.
| Parameter Category | Specification |
|---|---|
| Part Number Set | 3500/25 125800-01 (Module) + 149369-01 (Extension Cable) |
| Module Function | Radial Vibration Monitor / Proximitor Driver |
| Compatible Probe Types | Eddy current proximity probes (e.g., 5 mm, 8 mm, 11 mm). |
| Input Channels | Typically 2 channels per module. |
| System Gap Measurement Range | Typically -2 V to -18 V DC (corresponding to a physical gap, e.g., 0.3 to 2.3 mm). |
| Vibration Measurement Range | 0 to 400 µm (peak-to-peak) or other user-configurable ranges. |
| Frequency Response | 0.4 Hz to 10,000 Hz (dependent on configuration). |
| Cable Type (149369-01) | Double-shielded, coaxial extension cable with negative temperature coefficient compensation. |
| Cable Length | Specific length is defined by the last digits of the full part number (e.g., -005 for 5 meters). |
| Module Dimensions (H x W x D) | Approx. 190 mm x 60 mm x 140 mm (7.5 in x 2.4 in x 5.5 in) [Standard 3500 rack slot] |
| Module Weight | Approx. 0.7 kg (1.5 lbs) |
| Cable Weight | Varies significantly with length (e.g., ~0.5 kg for a 5-meter cable). |
| Mounting | Module slots into a 3500 series rack. Cable connects from the rack to the probe. |
| Operating Temperature (Module) | 0°C to +65°C (+32°F to +149°F) |
| Key Features | • Powers the proximity probe (Provides -24 V DC) • Conditions the vibration and gap (DC bias) signals • Provides OK, Alert, and Danger alarms per channel. |
Note: The exact specifications, particularly for the cable length and connector types, are defined by the full part number. The module dimensions are standard for a 3500 series frame.
Application Scenarios
The 3500/25 Module and its extension cable are fundamental components for protecting a wide range of high-speed rotating equipment by monitoring shaft relative vibration. Key application scenarios include:
Turbo-machinery Protection: Continuous monitoring of radial vibration on critical assets such as gas turbines, steam turbines, and centrifugal compressors.
Rotating Equipment Health: Detecting and providing alarms for common mechanical faults in pumps, motors, fans, and generators, including:
Unbalance
Misalignment
Shaft Looseness
Oil Whip/Whirl
Preventing Catastrophic Failures: Providing an automatic shutdown signal (via an associated relay module) when vibration levels reach a dangerous threshold, thereby preventing severe mechanical damage.
Condition-Based Maintenance: Providing vital data for predictive maintenance programs, allowing maintenance to be scheduled based on the actual condition of the machine.
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