BENTLY 125760-01

Description

Product Overview

The BENTLY 125760-01 is a critical vibration transducer, specifically a Proximitor® probe driver and signal conditioner, from the Bently Nevada line of machinery protection and monitoring systems. This module is not a PLC part per se, but an essential sensor interface device in industrial automation that provides the vital link between a shaft displacement probe (eddy current sensor) and the monitoring system (like a Bently 3500 rack or a PLC/DCS input). The BENTLY 125760-01 converts the raw RF signal from the probe into a scaled, high-integrity DC voltage proportional to the gap between the probe tip and the rotating shaft.

Key Product Parameters

• Product Type: Proximitor® (Probe Driver / Signal Conditioner)

• Compatible System: Interfaces with Bently Nevada displacement probes (e.g., 3300, 330105, etc.) and connects to monitoring systems.

• Input: Powers and receives the RF signal from an eddy current proximity probe (typically -24 VDC system voltage).

• Output: Provides a linear DC voltage output (e.g., -2 to -18 VDC) or a 4-20 mA signal that is proportional to the gap between the probe tip and the target (shaft).

• Linearity: High linearity across its specified measurement range (e.g., 0-200 mils or 0-5 mm).

• Power Supply: Requires a dedicated, clean DC power source, often -24 VDC.

• Frequency Response: Suitable for measuring both static position (gap) and dynamic motion (vibration) within its bandwidth.

• Connections: Typically features coaxial connectors for the probe and screw terminals for power and output signals.

Advantages and Core Features

The primary advantage of the BENTLY 125760-01 is its industry-standard reliability and accuracy for measuring shaft radial position (runout) and vibration. It is designed to operate in electrically noisy plant environments with excellent temperature stability. Its calibrated output ensures precise and repeatable measurements, which are critical for detecting misalignment, bearing wear, and other machinery faults. The device often includes features to compensate for cable length effects and provides a built-in oscillator to drive the probe. The rugged design of the 125760-01 makes it a trusted component for preventive maintenance and protection schemes.

Application Scenarios

This transducer is a foundational component in machinery health monitoring across industries with high-speed rotating equipment:

• Turbomachinery Protection: Measuring shaft displacement and vibration on steam turbines, gas turbines, and compressors in power generation and oil & gas.

• Critical Pump & Fan Monitoring: Monitoring radial play and vibration on large, high-energy pumps and induced draft fans.

• Hydroelectric Generators: Measuring generator air gap and shaft runout.

• Paper Machine Rolls: Monitoring vibration and position of large rolls.

• Metal Processing: Used on rolling mill drives and other critical spindles.

Comparison with Competing Products

Competing products include proximity probe systems from other manufacturers like Emerson (CSI 9400 series transmitters) or standalone signal conditioners from various sensor companies. The BENTLY 125760-01 is distinguished by the Bently Nevada brand’s decades of dominance in the turbomachinery protection market. Its performance specifications are often the benchmark, and its compatibility with the vast installed base of Bently Nevada probes and monitoring systems is a major advantage. Compared to some lower-cost alternatives, the 125760-01 offers proven performance in the most critical applications.

Selection Guide and Important Notes

Selecting the BENTLY 125760-01 requires matching it with the correct probe and understanding the requirements of the monitoring system.

Important Precautions:

• Probe Compatibility: The transducer must be matched with a compatible Bently Nevada proximity probe. The probe’s sensitivity and extension cable length affect system calibration.

• System Integration: The output signal type (voltage or current) and range must be compatible with the input card of the monitoring system (e.g., a Bently 3500/40M or a PLC analog input card).

• Power Supply Quality: The -24 VDC power source must be clean and stable. Noise on the power line will directly affect measurement accuracy.

• Calibration: The entire measurement loop (probe, extension cable, proximitor) is typically calibrated together as a system. Replacement of any component may require re-calibration.

• Installation: Proper mechanical installation of the probe (including gap setting) is as critical as the electronic performance of the 125760-01 itself.

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