144-192-000-122 Proximity Probe Unit

Module Feature

144-192-000-122 is factory-calibrated eddy current proximity probe for rotating machinery protection system.

It adopts integrated coil and sealed ceramic tip structure, matched with fixed capacitance extension cable and proximitor. It is resistant to oil, steam and high vibration environment, suitable for long-term installation on bearing housing of gas turbine, steam turbine and centrifugal compressor. It measures clearance between probe tip and rotating shaft surface, provides raw impedance signal for proximitor conversion. It is widely stocked as maintenance spare for power plant and oil & gas machinery protection cabinet.

Working principle

High-frequency excitation signal from proximitor is transmitted to probe coil.

Alternating magnetic field is generated at probe tip, and eddy current is induced on the metal shaft surface. The impedance of probe coil changes with the variation of shaft-to-probe gap. The impedance signal is sent back to proximitor for conditioning and converted into linear DC gap voltage for vibration calculation and alarm interlock.

Onboard components

High-frequency sensing coil, ceramic probe tip, hermetic metal housing, internal insulated lead, sealed crimp joint, coaxial cable connection interface.

LED indicators

Not applicable. Probe health status is judged by gap voltage and fault alarm signal output from matched proximitor module.

Hardware self‑diagnosis

No built-in diagnosis circuit. The paired proximitor detects probe open circuit, short circuit and abnormal impedance, and uploads fault alarm to monitoring system.

Programming software

System 1, used for vibration channel configuration, gap voltage check and machinery event recording.

Electrical & Process Parameters

Model:144-192-000-122 Brand:OEM turbomachinery monitoring spare Device type:Eddy current proximity probe Function:Non-contact shaft gap detection for radial vibration, axial thrust and keyphasor speed measurement

Mechanical & Structure

Mounting:Threaded stud mounting on probe bracket Protection class:IP66 after installation Housing:Stainless steel probe body + ceramic sensing tip

Environmental

Operating temperature:-40℃ ~ +180℃ Storage temperature:-40℃ ~ +85℃ Ambient humidity:5~95% non‑condensing

Certification:API 670 compliant, ATEX optional Status:Original rotating machinery monitoring spare

Installation

Stop rotating equipment before replacement.

Adjust target gap according to drawing, lock probe lock nut securely, use matched calibrated extension cable, verify gap voltage and vibration waveform after commissioning.

Interface

Threaded mounting stud, coaxial signal connector for extension cable.

Diagnostic

Probe fault alarm: Coil internal break, short circuit or cable damage. Vibration signal noisy: Poor shielding, ground loop interference or loose probe nut. Gap voltage drift: Target shaft surface damage, contamination on probe tip or improper installation clearance.

Product Brief

144-192-000-122 proximity probe, eddy current non-contact displacement spare for turbine and centrifugal compressor vibration monitoring system replacement.