BENTLY 135489-03

Description

BENTLY 135489-03 – Proximitor® Power Supply / Signal Conditioner

Product Description
The BENTLY 135489-03 is a Proximitor® Power Supply and Signal Conditioner, a critical component in machinery monitoring and protection systems from Bently Nevada (now part of Baker Hughes). This unit is not a PLC module but a specialized electronic device that provides the necessary power and signal conditioning for eddy current proximity probes (transducers) used to measure shaft vibration, displacement (position), and speed. The primary function of the BENTLY 135489-03 is to supply a high-frequency radio frequency (RF) excitation signal to the proximity probe and to convert the probe’s raw signal into clean, standardized voltage outputs (e.g., -1 to -20 Vdc for gap, and 0 to 1 Vpk for vibration) that can be safely read by monitoring systems like the Bently Nevada 3500, 3300 series, or other data acquisition systems. It acts as a vital interface between the sensitive probe and the control or monitoring system.

Product Parameters

• Type: Proximitor® Power Supply / Signal Conditioner.

• Compatible Systems: Bently Nevada monitoring systems and general-purpose interfacing.

• Input (Probe Side): Provides excitation and receives signal from one eddy current proximity probe (requires -18 Vdc or -24 Vdc power).

• Outputs (System Side):

  • Gap Voltage (DC): A -1 to -20 Vdc signal proportional to the average distance between the probe tip and the target (shaft).

  • Vibration Voltage (AC): A 0 to 1 V peak (typically) signal proportional to the dynamic vibration of the target.

• Power Requirement: Typically requires an external negative DC supply voltage (e.g., -18 Vdc to -24 Vdc).

• Mounting: DIN-rail mountable or panel-mounted enclosure.

• Features: Includes a meter for gap voltage indication, fine-tuning potentiometers for gap and vibration output scaling, and test points for calibration and troubleshooting.

• Compatibility: Designed for use with standard Bently Nevada 5 mm or 8 mm probes and extension cables.

Advantages and Features

• Dedicated Signal Integrity: The BENTLY 135489-03 is engineered to provide optimal power and conditioning specifically for Bently Nevada eddy current probes, ensuring accurate, reliable, and low-noise measurements of critical machinery parameters.

• Isolation and Protection: It provides electrical isolation between the probe/field wiring and the sensitive monitoring system inputs, protecting expensive monitoring hardware from potential ground loops or transients.

• Calibration and Scaling: Built-in potentiometers allow field technicians to fine-tune the gap (-Vdc) and vibration (AC) output scales to match the specific probe and machine characteristics, ensuring accurate readings.

• Essential for Integration: This unit is fundamental for integrating standard eddy current probes into systems that do not have built-in proximitor power supplies, or for creating custom monitoring solutions.

• Proven Reliability: As a core component of Bently Nevada’s measurement chain, it is built for continuous operation in industrial environments near rotating machinery.

Application Cases in Various Fields

• Power Generation (Gas & Steam Turbines): Providing conditioned vibration and position signals from shaft probes to protection systems (like the 3500) in turbines and generators.

• Oil & Gas (Compressors, Pumps): Monitoring radial vibration and axial position of shafts in centrifugal and reciprocating compressors on offshore platforms and pipelines.

• Heavy Industry (Paper Mills, Steel Plants): Monitoring critical fans, blowers, and large motors for predictive maintenance.

• General Machinery Monitoring: Used in test stands or custom-built monitoring systems for any rotating equipment where precise displacement and vibration measurement is required.

Comparisons with Competing Products

• Integrated System Modules (Bently Nevada 3500/42): In modern Bently Nevada 3500 racks, the Proximitor power supply and conditioner are integrated into the monitor module itself. The standalone 135489-03 is used for legacy systems, upgrades, or non-Bently monitoring systems.

• Other Vibration System Vendors (Emerson/CSI, Schenck): These companies have their own equivalent signal conditioners for their probes. The BENTLY 135489-03 is optimized for the Bently Nevada probe ecosystem and output scaling.

• Generic Proximity Sensor Power Supplies: Generic DC power supplies lack the specific high-frequency RF excitation, precise scaling controls, and standardized output voltages required for accurate eddy current displacement measurement. The 135489-03 is a purpose-built instrument.

Selection Suggestions and Precautions

1. Verify System Compatibility: Confirm that your monitoring system (e.g., PLC analog input card, data logger) accepts the voltage ranges provided by the BENTLY 135489-03 (-1 to -20V DC for gap, 0-1V AC for vibration). Check input impedance requirements.

2. Match the Probe: Ensure the proximity probe and extension cable are compatible with the 135489-03 (typically Bently Nevada 5mm or 8mm probe systems with proper calibration).

3. Provide Correct Power Supply: You must supply the required negative DC voltage (e.g., -24 Vdc) with sufficient current capacity. Using an incorrect or unregulated power source will cause faulty readings.

4. Proper Calibration is Mandatory: After installation, the unit must be calibrated using the target material and a micrometer or calibration fixture to set the correct gap voltage. Incorrect calibration renders the measurement useless.

5. Shielding and Grounding: Use fully shielded coaxial cables for both the probe connection and the output signals. Follow proper grounding practices to avoid electrical noise.

6. Consider Environmental Rating: The standard 135489-03 may be for protected enclosures. For harsh environments, verify its IP rating or plan for appropriate mounting inside a protective cabinet.

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