Description

Bently Nevada 18745-03 Proximitor Sensor

Configured for eddy-current signal conditioning and displacement transducer interface in turbine supervisory instrumentation systems, the Bently Nevada 18745-03, also cataloged as the 18745-03 Proximitor Sensor, provides direct electrical conversion of probe gap variation into proportional voltage output. The BA-18745-03 (18745-03 Proximitor Sensor) operates as a dedicated interface stage for 5 mm and 8 mm probe systems within rotor vibration measurement chains. Signal scaling at 200 mV/mil supports linear displacement interpretation under calibrated TSI front-end processing conditions.

Hardware Specifications

Parameter	Specification
Model	18745-03
Brand	Bently Nevada
Origin	USA
Weight	0.22 kg
Dimensions	10.2 cm x 11.4 cm x 13.2 cm
Operating Temp	-50 deg C to +120 deg C
Power Consumption	-24 VDC to -26 VDC input supply
Scale Factor	200 mV/mil
Frequency Response	0 to 10 kHz (±3 dB)
Sensor Type	5 mm / 8 mm Proximitor

Bently Nevada Eddy-Current Transduction Characteristics

The 18745-03 implements eddy-current probe signal conditioning with calibrated scaling of 200 mV/mil for linear gap-to-voltage conversion. Within TSI measurement chains, the device maintains stable transfer characteristics for proximity probe excitation loops, ensuring consistent interpretation of rotor shaft displacement. Gap voltage validation logic is aligned with standard -10 VDC reference thresholds used in probe-to-surface clearance verification. Signal integrity is maintained through cross-talk suppression between adjacent sensor channels in multi-probe installations.

Frequently Asked Questions (FAQ)

Q: Does the 18745-03 support both 5 mm and 8 mm proximity probes?
A: Yes. The input conditioning stage is designed for compatibility with both 5 mm and 8 mm eddy-current probe geometries, maintaining consistent scaling behavior across probe sizes.

Q: What is the functional meaning of 200 mV/mil scaling?
A: It defines the linear conversion ratio between mechanical shaft displacement (mil) and output voltage, enabling direct integration into vibration monitoring and waveform acquisition systems.

Q: What is the role of the supply voltage range?
A: The -24 VDC to -26 VDC supply provides regulated excitation for internal signal conditioning circuitry, ensuring stable probe driver operation and measurement linearity.

Field Installation Guidelines

The proximitor sensor shall be installed in a low-noise electrical environment with controlled grounding topology. Shield termination shall be implemented at a single-point earth reference to minimize ground loop formation. Probe cable routing must maintain separation from high-voltage switching conductors and variable frequency drive output lines.

Mechanical mounting shall ensure rigid fixation to prevent vibration-induced connector micro-movement. Ensure connector torque is within manufacturer-approved limits to maintain stable impedance characteristics across the eddy-current loop. Maintain adequate clearance for thermal dissipation within the -50 deg C to +120 deg C operating envelope.

Specifications

• Brand: Bently Nevada

Advantages

• High reliability in industrial environments
• Supports continuous operation
• Compatible with major PLC/DCS systems