BENTLY 133396-01

Description

Product Description

The BENTLY 133396-01 is a specialized Proximitor power supply and signal conditioning module, a fundamental component in Bently Nevada’s machinery monitoring systems. This device serves a dual purpose: it provides a precise, stable, high-frequency excitation voltage (-24 V DC, 200 mA typical) to power eddy current proximity probes (transducers), and it conditions the raw analog return signal from the probe. The 133396-01 converts the probe’s complex impedance change, caused by the gap between the probe tip and the rotating shaft, into clean, scalable DC voltage outputs representing both the dynamic vibration (AC) and average gap (DC) positions. The reliable operation of the BENTLY 133396-01 is essential for accurate measurement of shaft relative vibration, axial position, and differential expansion.

Technical Parameters

• Device Type: Proximitor Power Supply / Signal Conditioner.
• Manufacturer: Bently Nevada (a Baker Hughes business).
• Compatible Systems: Used as a field-mounted or rack-mounted component with Bently Nevada monitoring systems like the 3300 XL or as an accessory for the 3500 system. May also be used as a standalone unit.
• Input Power: Typically requires a +24 V DC or 115/230 V AC power input (depends on model variant).
• Probe Excitation: Supplies -24 V DC (200 mA RMS, 2-10 kHz) to the connected proximity probe.
• Output Signals:
  • Gap Voltage (DC Output): A DC voltage (typically -2 to -18 V DC) linearly proportional to the average distance between the probe tip and the target (shaft).
  • Vibration Output (AC Output): A buffered AC voltage (typically ±5 V peak) proportional to the dynamic vibration displacement of the shaft.
• Connections: Screw terminals or coaxial connectors for probe input, power input, and signal outputs.
• Linearity & Frequency Response: High linearity within the probe’s specified range and a flat frequency response suitable for vibration analysis (e.g., 0 to 10 kHz or higher).
• Diagnostics: May include an LED indicator for power or system fault.
• Mounting: DIN-rail mountable or panel-mountable enclosure.

Advantages and Features

• Precise and Stable Excitation: The 133396-01 provides the exact, regulated power required by Bently Nevada probes to ensure consistent sensitivity and calibration, which is critical for repeatable, accurate measurements.
• High-Fidelity Signal Conditioning: It extracts and amplifies the low-level probe signal with minimal noise and distortion, providing clean DC gap and AC vibration signals suitable for input to monitors, data collectors, or PLC systems.
• Robust Industrial Design: Housed in a durable metal or high-grade plastic enclosure, it is built to withstand harsh plant environments with temperature extremes, humidity, and electrical noise.
• System Flexibility: The BENTLY 133396-01 can be used as a critical interface component in permanent monitoring systems (3300/3500) or as a portable tool for commissioning and troubleshooting with a single probe.
• Proven Reliability: As a core Bently Nevada component, it offers the high reliability expected for continuous protection and monitoring of critical rotating machinery.

Application Cases in Various Fields

• Turbine/Generator Monitoring: Providing conditioned vibration and position signals from radial and axial probes to protection systems (3500) on steam and gas turbines in power plants.
• Compressor Protection: Key component in monitoring radial vibration and axial thrust position on centrifugal and axial compressors in oil, gas, and petrochemical facilities.
• Large Pump & Motor Monitoring: Used to monitor shaft vibration and relative position on critical pumps and motors in water treatment, mining, and heavy industry.
• Commissioning & Field Service: Used by technicians as a portable unit to verify probe installation, set initial gap voltages, and troubleshoot sensor loops during machine startup or maintenance.
• Integration with Third-Party Systems: Providing standardized analog vibration and position signals to DCS, PLC, or other condition monitoring systems that do not have native proximity probe interfaces.

Comparison with Competing Products

The BENTLY 133396-01 competes with similar proximitor power supplies from other vibration monitoring specialists like Metrix (now RAE), Emerson (CSI), and SKF. Its key competitive advantages are:

• Optimized for Bently Nevada Ecosystem: It is the preferred and guaranteed-compatible power supply for Bently Nevada’s extensive line of proximity probes, ensuring performance as specified in the system design.
• Industry Standard Recognition: Bently Nevada’s technology is the benchmark in critical machinery protection. Using their genuine 133396-01 component is often specified or trusted for high-criticality applications.
• Signal Quality and Consistency: Known for providing exceptionally clean and stable output signals, which is paramount for accurate vibration analysis and reliable protection.

Selection Suggestions and Precautions

1. Verify Probe Compatibility: Ensure the 133396-01 is compatible with the specific Bently Nevada probe model (e.g., 3300 XL 8mm, 11mm) and its required cable length. Different probes have specific drive requirements.
2. Correct Installation and Grounding: Mount the unit securely. Follow strict grounding guidelines: typically, ground the unit enclosure to a solid earth ground and ensure the probe cable shield is grounded only at the Proximitor end (not at the probe) to prevent ground loops.
3. Proper Cable Routing: Use approved, high-quality coaxial cable for the probe connection. Route the cable away from power cables and sources of electrical noise to prevent signal interference.
4. Set Gap Voltage Correctly: Use the DC output (Gap Voltage) to set the probe’s operating point during installation according to the probe’s specification sheet (typically -9 to -11 V DC for a midpoint gap).
5. Regular Verification: Periodically verify the output of the BENTLY 133396-01 during maintenance routines. Check that the gap voltage is stable and that a known mechanical stimulus (e.g., a tap near the probe) produces a clear AC response.

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