Product Overview

The Bently Nevada 18745-03 is a high-precision Proximitor Sensor engineered specifically for the legacy 7200 Series Proximity Transducer System. This module serves as the critical electronic interface that provides excitation to the probe and conditions the return signal into a usable voltage output. By utilizing eddy current technology, the 18745-03 enables non-contacting measurement of shaft displacement and vibration. It is designed to interpret data from both 5 mm and 8 mm probes, making it a versatile component for older Turbine Supervisory Instrumentation (TSI) infrastructures that require high-fidelity static and dynamic monitoring.

Hardware Parameters and Key Technical Characteristics

As an API 670 compliant signal conditioner, the 18745-03 maintains strict linearity and temperature stability to ensure accurate machinery protection data.

• Model Number 18745-03

• Transducer Compatibility Bently Nevada 7200 Series 5 mm and 8 mm Probes

• Linear Range 2.0 mm (80 mils)

• Output Sensitivity 7.87 V/mm (200 mV/mil)

• Total System Length Typically calibrated for 5.0 meter or 9.0 meter configurations

• Frequency Response 0 Hz (DC) to 10 kHz

• Input Voltage -17.5 Vdc to -26 Vdc

• Output Voltage Range -1.0 Vdc to -17 Vdc (Gap dependent)

• Temperature Stability Specifically compensated for industrial environments (-35°C to +85°C)

• Enclosure Material Corrosion-resistant aluminum alloy

• Weight 0.25 kg

Industrial Applications and Operational Use Cases

The 18745-03 is a primary solution for the upkeep and maintenance of existing 7200 series monitoring networks across diverse heavy industries.

• Radial Vibration Analysis Monitoring the dynamic motion of rotating shafts in steam and gas turbines to identify unbalance and misalignment.

• Axial Thrust Monitoring Tracking the static position of the rotor relative to the thrust bearing to prevent internal mechanical contact.

• Retrofit and Lifecycle Support Providing a direct replacement component for aging 7200 series systems in power plants and refineries without requiring a full rack upgrade.

• Centrifugal Compressor Protection Continuous surveillance of high-speed compressor shafts to detect fluid-film bearing degradation.

• Shaft Eccentricity Measuring rotor bow or warp during turbine startup (slow-roll) to ensure safe acceleration.

The 18745-03's robust circuitry and standardized voltage output allow for seamless integration with Bently Nevada 3300 or 9000 series monitoring racks, providing a dependable bridge between the sensor and the protection logic.