Overview
The EPRO CON021 + PR6424/002-010 is an eddy-current proximity probe system designed for non-contact measurement of radial shaft vibration and displacement on industrial rotating equipment such as turbines and compressors. The PR6424/002-010 probe features an 8 mm diameter sensing tip and integrates a 1-meter armored cable terminated with a LEMO connector. Meanwhile, the CON021 driver converter supplies the system and conditions the output signal for downstream monitoring.
Sensing Principle and Signal Output
The system operates on the eddy-current principle, generating an output voltage that varies linearly with the probe-to-target gap. The CON021 delivers a –4 V to –20 V DC linear range over the full measurement span, with a total output swing from –1 V to –22 V DC. At the nominal mounting gap, the gap voltage settles at –12 V DC. Furthermore, the sensitivity is fixed at –7.87 V/mm (–200 mV/mil), referenced to 42CrMo4 steel calibration material. Therefore, users must verify target material compatibility to maintain stated accuracy.
Electrical and Performance Specifications
The CON021 requires a –24 V DC supply, with an allowable operating range of –18 V to –30 V DC. Linearity error remains within ≤1.5% of full scale across the measurement range. In addition, the frequency response extends from 0 Hz to 10 kHz, covering both slow shaft displacement and higher-order vibration components. The probe cable withstands up to 200°C, while the CON021 driver operates from –35°C to +100°C.
| Parameter | Specification |
|---|---|
| Probe model | PR6424/002-010 (8 mm diameter) |
| Matching driver | CON021 |
| Supply voltage | –24 V DC (–18 V to –30 V operating range) |
| Output signal | –4 V to –20 V DC linear; –1 V to –22 V DC full range |
| Nominal gap voltage | –12 V DC |
| Sensitivity | –7.87 V/mm (–200 mV/mil) |
| Linearity error | ≤1.5% of full scale |
| Frequency response | 0 Hz to 10 kHz |
| Cable length | 1 m integrated, armored |
| Operating temperature | –35°C to +100°C (CON021); probe cable up to 200°C |
| Calibration material | 42CrMo4 steel |
System Compatibility
This probe and driver combination interfaces directly with EPRO MMS6000 machinery monitoring systems. The LEMO connector on the probe mates with the CON021 driver, forming a pre-matched measurement channel. Furthermore, the driver’s voltage output is scaled for direct input to standard TSI analog acquisition modules. No user calibration is required when the probe and driver pairing matches the original factory configuration.
Frequently Asked Questions
Q: Can the PR6424/002-010 probe be used with a different driver model than the CON021?
A: No. Eddy-current probe systems require matched probe and driver pairs. The PR6424/002-010 is calibrated specifically for the CON021 driver. Using a different driver will shift the gap voltage, sensitivity, and linearity beyond stated specifications.
Q: What does the –4 V to –20 V output represent in actual measurement?
A: The –4 V to –20 V span corresponds to the linear measurement range referenced to the calibrated gap. As shaft displacement increases toward the probe tip, the output becomes more negative. The nominal gap voltage of –12 V DC centers the measurement within this range.
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