I. Complete Configuration Description

PR6423/001-000: EPRO eddy current probe sensor

CON021: Dedicated preamplifier for matching

This complete set is used for measuring shaft vibration, shaft displacement, eccentricity, and phase difference of steam turbines, fans, and compressors, and is compatible with the MMS6000/AMS6500 TSI system.

II. Parameters of PR6423/001-000

Probe Specifications: Φ8mm Small Electromagnetic Eddy Current Sensor

Model Interpretation

PR6423: 8mm Standard Eddy Current Probe Series

001: Integrated Short Cable, Without Armor

000: Standard Range and Factory Calibration Version

Measurement Performance

Standard Linear Range: 0 - 1.5mm

Rated Sensitivity: 12 V/mm

Recommended Installation Working Gap: 2.5mm

Frequency Response: 0 - 12kHz

Operating Temperature: Probe -35℃ - +150℃

Compatible Materials: 42CrMo4 and other ferromagnetic steels with surface roughness Ra ≤ 3.2μm

Electrical Parameters

DC Resistance of Coil: Approximately 4 - 6Ω

Insulation Resistance: > 100MΩ

III. Parameters for Companion of CON021 Preamplifier

Power Supply: -24VDC (-18 - -30VDC) Output characteristics

Static gap voltage range: -4V ～ -20V

Matching PR6423 operating point: When the gap is 2.5mm, the output is approximately -12V during operation.

Power consumption: ≤2W

Frequency response: 0～10kHz, compatible with vibration measurement

Includes reverse connection, short circuit, and open circuit protection

IV. Definition of Complete Wiring

CON021 Terminal

1 Port: Negative terminal of -24V power supply

2 Port: Ground terminal of 0V power supply

3 Port: Signal output (connected to TSI module such as MMS6110/MMS6312)

4 Port: Common ground of signal

Sensor and preamplifier connection

PR6423 comes with a cable directly plugged into CON021 LEMO aviation connector. Tighten the lock to connect, no additional terminals required.

Shielding requirements: Single-ended grounding throughout, only grounded at the preamplifier/cabinet side, and the probe side shield is left floating.

V. Installation and Commissioning Key Points

Install the gap

PR6423 standard calibration: 2.5mm, corresponding to the best linear midpoint of the preamplifier output -12V.

Wiring requirements

Sensor cable should be kept away from power cables and drive units, run parallel with a spacing of no less than 300mm, and must not be in the same cable tray as the power cables.

Power-on calibration

First, supply -24VDC to CON021

Gradually adjust the probe's advance and retreat, measure the output of the preamplifier with a multimeter

Adjust to **-12V** and lock the fixing screws

Normal voltage range

Small gap: Output approaches -4V

Large gap: Output approaches -20V

No voltage / Close to 0V: Probe disconnected, connector not locked, power reversed