Epro CON021+PR6423/00R-030 Displacement System

System Overview

The Emerson EPRO measurement solution combining PR6423/00R-030 proximity probe and CON021 signal converter is a matched eddy-current displacement system designed for continuous monitoring of rotating machinery behavior.

The probe captures non-contact shaft movement, while the CON021 module converts the raw signal into standardized industrial outputs for control, diagnostics, and protection layers. This configuration is commonly used in API 670-aligned machinery monitoring architectures.

The system is factory-calibrated as a pair, eliminating field calibration requirements and ensuring consistent transfer accuracy.

Measurement Principle

The probe operates by generating a high-frequency electromagnetic field at the tip. Variations in shaft-to-probe distance alter the eddy-current response in the conductive target surface. These variations are converted into proportional voltage signals, which are then conditioned by the CON021 module into linear engineering values.

This architecture enables stable measurement of both static and dynamic shaft behavior in harsh rotating equipment environments.

PR6423/00R-030 Probe Specifications

Sensing Performance

• Sensor type: Eddy-current non-contact displacement probe

• Probe diameter: 8 mm

• Linear measurement span: 2.0 mm (80 mil)

• Nominal operating gap: 0.5 mm

• Sensitivity: 8 V/mm (± standard tolerance)

• Frequency bandwidth: DC to 10 kHz

• Minimum shaft diameter: ≥25 mm

• Target surface: Magnetic steel (e.g., 42CrMo4 / AISI 4140 equivalent)

Mechanical Construction

• Thread configuration: M10×1 or 3/8"-24 UNF

• Integrated cable length: 3 m (variant 00R-030)

• Cable insulation: PTFE high-temperature resistant jacket

• Optional armored cable version available

• Probe tip material: PEEK polymer

• Housing material: Stainless steel

Environmental Ratings

• Operating temperature (probe): –35 °C to +180 °C

• Cable temperature limit: up to +150 °C

• Protection class: IP66

• Mechanical shock resistance: up to 40 g

• Vibration tolerance: up to 20 g (10–2000 Hz range)

CON021 Signal Converter Specifications

Electrical Performance

• Supply voltage: 24 V DC ±10%

• Output formats: 4–20 mA, 0–20 mA, 0–10 V (module dependent)

• Linearity deviation: ≤ ±1.5% with matched probe

• Temperature drift: ≤ 0.05% per °C

• Frequency response: DC to 10 kHz

Mechanical & Installation

• Mounting type: 35 mm DIN rail

• Housing protection: IP20

• Electrical interface: Screw terminals or system connector options

• Compatible probe families: PR6422 / PR6423 / PR6424 / PR6426

Integrated System Performance

When used as a complete measurement chain, the PR6423/00R-030 and CON021 deliver stable, calibrated displacement monitoring:

• Measurement principle: Eddy-current non-contact sensing

• Linear range: 2 mm

• Sensitivity: 8 V/mm

• Bandwidth: up to 10 kHz

• Output signals: Industrial standard current or voltage

• Temperature capability: up to +180 °C (probe section)

• Factory-matched calibration eliminates field adjustment

Industrial Applications

• Steam and gas turbine shaft axial displacement monitoring

• Compressor rotor vibration and eccentricity detection

• Gearbox shaft movement and alignment supervision

• Bearing clearance and thermal growth measurement

• High-speed rotating machinery condition monitoring

FAQ

Q: Is field calibration required after installation?
A: No. The probe and converter are factory-matched for direct installation.

Q: What output signals are available from CON021?
A: Depending on configuration, 4–20 mA, 0–20 mA, or 0–10 V outputs are supported.

Q: Can this system operate in high-temperature turbines?
A: Yes. The probe is rated up to +180 °C for continuous operation.

Q: Is this compatible with other EPRO probes?
A: Yes. CON021 supports multiple PR6422–PR6426 series probes.