Bently Nevada 18745-02 | Proximitor Sensor

Overview

The Bently Nevada 18745-02 Proximitor® Sensor belongs to the 7200 Series eddy current proximity measurement system. It functions as the signal-conditioning element within a non-contact transducer system, converting raw probe signals into stable, calibrated outputs suitable for machinery protection and condition monitoring systems.

This model is engineered for continuous measurement of shaft vibration, axial position, and relative displacement in high-value rotating equipment, including turbines, compressors, pumps, motors, and generators. The sensor is designed to operate reliably in harsh industrial environments and remains compatible with legacy Bently Nevada proximity systems.

Functional Role in the Measurement System

The 18745-02 Proximitor® Sensor operates between the proximity probe and the monitoring or control system. It supplies excitation to the probe, processes the returned eddy current signal, and delivers a linear, conditioned output proportional to shaft position or vibration.

When paired with compatible probes and extension cables, it forms a complete proximity transducer system that meets API 670 requirements for critical machinery protection.

Key Technical Specifications

• Sensor Technology: Eddy current, non-contact measurement

• Supported Measurements: Shaft vibration, axial position, relative displacement

• Frequency Bandwidth: DC to approximately 10 kHz

• Measurement Range: Typically 2.0 mm (80 mils) linear range, probe dependent

• Usable Gap Range: Approximately 0.25 to 2.0 mm (10–80 mils), probe dependent

• Output Options: Proportional voltage or current output (system configuration dependent)

• Power Supply Requirement: Nominal -24 VDC (operating range approximately -18 to -24 VDC)

• Operating Temperature: -35 °C to +177 °C

• Cable Compatibility: Extension cables up to 9 m (30 ft), system-matched

• Mounting: Industrial housing suitable for panel or bracket mounting

• Compliance: Designed for API 670 machinery protection systems

• Construction: Industrial-grade electronics with vibration-resistant enclosure

System Compatibility

The 18745-02 is designed for seamless integration with:

• Bently Nevada 7200 Series proximity probes

• Selected legacy 3300 Series proximity systems

• Bently Nevada 3500 Series machinery protection monitors

• Condition monitoring and diagnostic platforms requiring stable, calibrated proximity signals

Backward compatibility makes this model suitable for both retrofit projects and new installations where long-term system continuity is required.

Typical Application Areas

• Steam and gas turbines for radial vibration and axial position monitoring

• Centrifugal and axial compressors in oil, gas, and petrochemical facilities

• Pumps operating under high load or variable process conditions

• Large motors and generators requiring continuous shaft condition monitoring

• Critical rotating assets governed by API 670 compliance standards

FAQ

What is the primary function of the 18745-02 Proximitor® Sensor?

It conditions and linearizes the signal from an eddy current proximity probe, providing a stable output for vibration, position, or displacement monitoring systems.

Can this sensor be used in API 670 applications?

Yes. When installed as part of a complete Bently Nevada proximity system, it is suitable for API 670-compliant machinery protection applications.

Is the sensor interchangeable with older Bently Nevada systems?

The 18745-02 maintains compatibility with certain 7200 and legacy 3300 Series configurations, making it suitable for upgrades and replacements.