BENTLY 125760-01

Description

Product Description

The BENTLY 125760-01 is a Proximitor® Power Supply and Signal Conditioner module from Bently Nevada (a Baker Hughes business), a global leader in machinery condition monitoring. This module, the BENTLY 125760-01, is a dual-channel unit designed to provide the necessary excitation power to two eddy current proximity probes and to condition their raw signals into clean, standardized outputs. Its primary function is to power the probes, process the gap voltage signals (which represent the distance between the probe tip and the observed surface), and produce scaled analog outputs (e.g., 4-20 mA or 0-10 VDC) proportional to vibration or position for connection to control and monitoring systems. The reliable performance of the BENTLY 125760-01 is fundamental for accurate shaft vibration, axial position, and speed measurement.

Product Parameters

The technical specifications for the BENTLY 125760-01 power supply/conditioner are defined for precision measurement:

• Module Type: Dual-Channel Proximitor Power Supply & Signal Conditioner.

• Channels: Two independent, isolated channels.

• Probe Compatibility: Designed to power and interface with standard Bently Nevada eddy current proximity probes (e.g., 5 mm, 8 mm, 11 mm probes).

• Output Power: Provides a regulated -24 V DC excitation voltage to each connected probe.

• Input Signal: Accepts the raw analog gap voltage from the probe (typically -2 to -18 V DC).

• Output Signals: For each channel, provides:

  • A scaled analog output (e.g., 4-20 mA, 0-10 VDC) proportional to vibration (peak-to-peak) or position (mm/mils).

  • A raw gap voltage output (-V DC) for diagnostics and setup.

• Scaling & Calibration: Features potentiometers for zero and span adjustment to calibrate the output to the desired engineering units (mils, mm, µm).

• Power Supply: Requires an external power input, typically +24 V DC.

• Mounting: DIN-rail mountable for easy installation in control panels.

• Indicators: LED indicators for power and channel status.

Advantages and Features

The BENTLY 125760-01 offers key benefits for reliable machinery monitoring:

• High Accuracy and Stability: The BENTLY 125760-01 provides stable excitation power and precise signal conditioning, resulting in accurate and repeatable vibration/position measurements critical for machinery protection and diagnosis.

• Dual-Channel Efficiency: Two independent channels in one compact unit save panel space and reduce wiring complexity compared to using two single-channel conditioners.

• Proven Compatibility: Engineered to work optimally with Bently Nevada’s extensive range of proximity probes, ensuring correct electrical matching and performance as specified in API 670 standards.

• Easy Field Calibration: The front-panel zero and span potentiometers allow for straightforward field calibration using a multimeter or the system’s monitoring software, simplifying commissioning and maintenance.

• Robust Industrial Design: Built to withstand the electrical noise, vibration, and temperature variations present in industrial environments like power plants and compressor stations.

Application Cases in Industry

This signal conditioner is widely used for monitoring rotating equipment across critical industries:

• Steam & Gas Turbines: Conditions signals from shaft vibration probes and thrust position probes on turbine-generator sets for protection and efficiency monitoring.

• Centrifugal Compressors: Used to monitor radial vibration and axial displacement on critical process compressors in oil & gas and petrochemical plants.

• Large Motors & Pumps: Provides conditioned vibration signals for motors and pumps in critical service, such as boiler feed pumps or cooling water pumps.

• Hydro Turbines: Monitors shaft runout and vibration on large water turbines.

• Paper Machine Rolls: Used to measure vibration on large dryer rolls and other critical rolls in paper manufacturing.

Comparisons with Competing Products

When compared to generic DC power supplies combined with separate signal amplifiers, or conditioners from other manufacturers, the BENTLY 125760-01 provides an integrated, purpose-built solution:

• Integrated System vs. Discrete Components: The BENTLY 125760-01 combines a precisely regulated probe power supply, a high-quality signal conditioner, and isolation in one tested unit. A cobbled-together solution lacks integration, is more prone to noise, and requires more engineering effort.

• Optimized for Eddy Current Probes: Its circuitry is specifically designed for the electrical characteristics of eddy current probes, providing the correct excitation and optimal signal processing for this sensor type. Generic amplifiers are not optimized for this purpose.

• Compliance with Industry Standards: Its design and performance align with industry standards for machinery protection (like API 670), which is often a contractual requirement. Generic components do not carry this compliance.

• Superior Support and Documentation: As part of the Bently Nevada ecosystem, it comes with comprehensive application notes, calibration procedures, and access to specialized technical support, which is not available for generic parts.

Selection Suggestions and Precautions

Proper setup and calibration are essential for accurate measurements:

1. Verify Probe Compatibility: Ensure your proximity probes (model, length, extension cable) are listed as compatible with the BENTLY 125760-01 conditioner. Using an incompatible probe can result in incorrect scaling or damage.

2. Correct Probe Installation and Gap Setting: The mechanical installation of the probe is critical. The probe must be installed with the correct gap (typically per the probe’s calibration sheet, e.g., 1.0 mm / 40 mils). Use the conditioner’s gap voltage output and a voltmeter to set this gap accurately.

3. Perform Proper Calibration: After installation, calibrate the 125760-01‘s output. Use a micrometer or known displacement to set the zero and span potentiometers so the 4-20 mA output corresponds correctly to the physical measurement (e.g., 4 mA = 0 mils, 20 mA = 4 mils).

4. Use Shielded Cabling: Always use the proper double-shielded, coaxial cable specified by Bently Nevada between the probe and the conditioner. Terminate shields correctly (usually at the conditioner end only) to prevent ground loops and noise.

5. Provide Clean Power: Use a well-regulated, isolated +24 V DC power supply. Electrical noise on the power input can directly affect the accuracy of the conditioned output signal.

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