144-159-000-501 Proximitor Monitor Assembly Unit

Module Feature

144-159-000-501 is a calibrated proximitor signal conditioning assembly for eddy current vibration monitoring system.

It supplies high-frequency RF excitation signal to the proximity probe, receives return impedance signal and converts gap distance into standard DC gap voltage output. It is factory calibrated for specified probe and extension cable capacitance, ensures linear measurement range of shaft gap and vibration. It provides hardware fault detection for probe open, short circuit and cable anomaly. Widely adopted in power plant, oil & gas and petrochemical turbomachinery rack as maintenance spare.

Working principle

Oscillator circuit inside proximitor generates stable high-frequency excitation signal and sends to probe coil.

Eddy current induced on the metal shaft surface changes coil impedance. The proximitor detects impedance variation and outputs DC voltage proportional to probe-to-shaft gap. The voltage signal is sent to the monitoring rack for vibration calculation, alarm and protection interlock.

Onboard components

High frequency oscillation circuit, signal demodulation circuit, linear conditioning circuit, fault detection circuit, status LED array, coaxial probe connector, rack backplane terminal block and metal shielding housing.

LED indicators

Front LEDs indicate power ready, normal gap status, probe fault and signal alarm.

Hardware self‑diagnosis

Built-in supervision detects probe open circuit, short circuit, gap out-of-limit and internal circuit failure. Fault alarm can be viewed from host monitoring software.

Programming softwareSystem 1, used for channel configuration, gap voltage setup and vibration trend review.

Electrical & Process Parameters

Model:144-159-000-501 Brand:OEM turbomachinery monitor spare Device type:Eddy current proximitor signal conditioning assembly Function:Convert eddy current probe impedance signal into gap voltage for shaft vibration and thrust monitoring

Mechanical & Structure

Mounting:Plug-in rack slot installation Protection class:IP20 Housing:Metal shielded industrial PCB assembly

Environmental

Operating temperature:-20℃ ~ +70℃ Storage temperature:-40℃ ~ +85℃ Ambient humidity:5~95% non‑condensing

Certification:CE, ATEX optional

Status:Original turbomachinery monitoring spare

Installation

Power off rack before replacement.

Use matched calibrated probe and extension cable, lock coaxial connector tightly, verify gap voltage after commissioning.

Interface

Coaxial connector for eddy current probe cable, rack backplane signal terminal, 24VDC auxiliary power terminal.

Diagnostic

Gap voltage drift: Wrong capacitance cable, probe tip damage or connector loose. Probe fault alarm: Cable open/short circuit or internal proximitor circuit breakdown. Unstable vibration reading: Ground loop interference or shielding damage.

Product Brief

144-159-000-501 proximitor assembly, eddy current signal conditioning spare unit for turbine and compressor shaft vibration monitoring rack replacement.