EPRO PR6423/011-110 + CON021

EPRO PR6423/011-110 + CON021

Product Overview
The EPRO PR6423/011-110 + CON021 is a non-contact eddy current displacement and vibration measurement system. The PR6423 probe measures the distance between the probe tip and a conductive metal surface, while the CON021 transducer converts the probe signal into a linear analog output. The system is widely used for shaft vibration, shaft position, eccentricity, and axial displacement monitoring on rotating machinery.

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Description

EPRO PR6423/011-110 + CON021

Technical Specifications

  • Brand: EPRO, part of Emerson
  • Sensor Model: PR6423/011-110
  • Transducer Model: CON021
  • Sensor Type: Non-contact eddy current proximity sensor
  • Probe Tip Diameter: 8 mm typical for PR6423 series
  • Thread Connection: M10×1 typical for PR6423 series
  • Typical Linear Range: ±1.0 mm for PR6423 with standard CON021 configuration
  • Typical Sensitivity: Approximately 8 V/mm, depending on factory calibration
  • Frequency Response: 0 Hz to approximately 10 kHz to 20 kHz, depending on configuration
  • Rise Time: Less than 15 µs
  • Supply Voltage: Typically -24 V DC for CON021
  • Output Signal: DC voltage with superimposed AC vibration signal
  • Linear Output Range: Typically -4 V to -20 V with -24 V supply
  • Output Impedance: Approximately 100 kΩ
  • CON021 Protection Rating: IP20
  • Probe Protection Rating: Depends on probe variant and cable termination
  • Calibration Material: Typically 42CrMo4 / AISI 4140 steel unless otherwise specified

Functional Features

  • Provides non-contact measurement of shaft position and vibration.
  • Delivers high linearity and fast dynamic response.
  • Outputs a DC gap voltage for position monitoring and an AC component for vibration analysis.
  • Factory-calibrated as a matched probe, cable, and transducer system.
  • Supports radial vibration, axial displacement, eccentricity, and speed measurement.
  • Resistant to oil, moisture, dust, and many industrial contaminants.
  • Compatible with EPRO MMS 3000 and MMS 6000 monitoring systems.

Application Scenarios

  • Steam turbine shaft vibration monitoring
  • Gas turbine rotor position measurement
  • Compressor axial and radial displacement monitoring
  • Pump and fan bearing vibration monitoring
  • Generator shaft eccentricity monitoring
  • Gearbox rotor dynamic monitoring
  • Industrial rotating equipment protection systems

Performance Parameters

  • Linear range for PR6423 with standard CON021 is typically ±1.0 mm.
  • Linearity error for with CON0X1 is typically ≤1.0 percent of full scale.
  • Linearity error for with CON0X1/91 extended-range versions is typically ≤2.0 percent.
  • Zero-point temperature drift is approximately 200 mV per 100 K.
  • Sensitivity temperature drift is typically less than 2 percent per 100 K.
  • Time drift is typically no more than 0.3 percent.
  • Supply voltage influence is typically less than 0.2 percent per volt.

Material Composition

  • Probe housing typically made of stainless steel
  • Probe tip assembly typically uses PEEK or similar high-performance insulating material
  • Cable insulation typically uses PTFE
  • Connector housing typically uses nickel-plated brass for LEMO-type connections
  • transducer housing uses industrial plastic or metal enclosure with screw terminals

Structural Features

  • Compact cylindrical probe design for threaded installation
  • M10×1 mounting thread typical for series
  • LEMO self-locking connector or screw terminal connection depending on configuration
  • transducer designed for panel or DIN-rail mounting
  • Screw terminals for power supply and signal output
  • LEMO connector for probe input on

Working Principle
The transducer supplies a high-frequency excitation signal to the probe coil. When the probe tip approaches a conductive metal surface, eddy currents are induced in the target material. These eddy currents change the effective impedance of the probe coil. The change varies with the distance between the probe tip and the target surface. The transducer detects this change and converts it into a linear DC voltage. The DC component represents the average gap, while the AC component represents dynamic vibration. The system is factory-calibrated so that the output voltage is proportional to displacement within the specified linear range.

Installation Requirements

  • Install the probe into a clean threaded mounting hole or bracket.
  • Set the static air gap according to the factory calibration curve.
  • A typical installation gap for is around 1.0 mm, but the exact value must be confirmed from the calibration sheet.
  • Adjust the gap until the DC output voltage reaches the specified mid-range value, typically around -10 V to -12 V.
  • Use shielded cables and keep signal cables separated from power cables.
  • Ground the cable shield at the transducer end only to avoid ground loops.
  • Mount the transducer in a dry, ventilated control cabinet.
  • Ensure the total system cable length matches the calibrated length.
  • Verify supply voltage polarity before energizing the system.

Precautions for Use

  • Do not mix probes, cables, and transducers from different calibrated sets without re-verification.
  • Do not use the standard in explosive atmospheres unless an approved intrinsically safe barrier is used.
  • Keep the probe face clean and free from oil, metal particles, and deposits.
  • Avoid installing the probe near keyways, oil holes, or surface discontinuities.
  • Do not exceed the rated supply voltage.
  • Verify gap voltage after mechanical locking to prevent shift during tightening.
  • Perform periodic calibration checks to maintain measurement accuracy.
  • Refer to the official EPRO calibration certificate and installation manual for the exact /011-110 configuration.

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