Product Overview

The Emerson EPRO PR6423/000-030-CN measures shaft dynamic displacement without contact. This 8mm eddy current sensor belongs to the EPRO PR6423 series. It measures radial vibration, axial position, eccentricity, and speed on critical turbomachinery. The PR6423/000-030-CN works with steam turbines, gas turbines, hydro turbines, compressors, gearboxes, pumps, and fans. Its PEEK sensor tip and stainless steel case withstand harsh conditions. IP66 protection ensures reliable operation in dusty or wet environments.

Key Features

• Linear measurement range: 2 mm (80 mils) with 0.5 mm initial air gap

• Sensitivity: 8 V/mm (203.2 mV/mil) at 0-45°C

• Operating temperature (sensor with 1m cable): -35 to +180°C

• Protection class: IP66 (IEC 60529)

• Tip diameter: 8mm

• Case thread: M10 x 1

• Cable length: 8.0 meters (code 3)

• Cable end: Country specific (CN)

• Hazardous area approvals: ATEX, IEC-Ex, CSA (ia and nA)

Technical Specifications

Model Identification

The PR6423/000-030-CN model number breaks down as follows:

Performance Specifications

The PR6423/000-030-CN provides excellent linearity across its 2mm range. Install the sensor with a 0.5mm initial air gap for optimal performance. This places the target at the center of the linear range.

Minimum Target Shaft Diameter

• Standard: 25 mm (0.79") minimum diameter

• Target material (ferromagnetic steel): 42CrMo4 (AISI/SAE 4140) standard

• Other materials: Available on request

Environmental Specifications

Protection and Ingress

• Protection class: IP66 (IEC 60529)

• Ingress protection: Dust-tight and protected against powerful water jets

Temperature Ratings

Materials

Weight

• Sensor with 1m cable: Approximately 100 grams (3.53 oz)

• Total with 8m cable: Proportionally heavier

Hazardous Area Approvals

The Emerson EPRO PR6423/000-030-CN carries multiple hazardous area certifications:

Intrinsic Safety (ia)

• Certifications: ATEX, IEC-Ex, CSA

• Area classification: Depends on converter (see converter documentation)

Non-sparking (nA)

• Certifications: ATEX, IEC-Ex, CSA

• Area classification: Depends on converter

Sensor Temperature Classification

Select the appropriate temperature class for your hazardous area. The PR6423/000-030-CN supports T3 classification up to 160°C ambient.

Compliance and Certifications

Applications

The PR6423/000-030-CN suits these critical machinery monitoring applications:

• Radial shaft vibration: Detect bearing wear and unbalance

• Axial shaft position: Monitor thrust bearing condition

• Shaft eccentricity: Measure bow during start-up and slow roll

• Rotating speed: Count gear teeth or key phasor marks

• Steam turbines: High temperature applications up to 180°C

• Gas turbines: Compressor section monitoring

• Hydro turbines: Large shaft radial vibration

• Compressors: High-speed centrifugal and axial machines

• Gearboxes: Shaft position monitoring

• Pumps: Large industrial pump protection

• Fans: Critical draft fan monitoring

Target Requirements

The Emerson EPRO PR6423/000-030-CN requires a ferromagnetic target for proper operation. The standard target material is 42CrMo4 (AISI/SAE 4140). For non-ferromagnetic shafts (aluminum, titanium, stainless steel), consult EPRO for calibration adjustments.

Minimum Shaft Dimensions

• Minimum diameter: 25 mm (0.79")

• Minimum flat surface width: Equal to tip diameter (8mm) plus margin

Do not install the PR6423/000-030-CN facing a shaft shoulder or step. The target surface must be continuous and smooth across the sensing area.

Installation Guidelines

Follow these steps to install the PR6423/000-030-CN sensor correctly:

Mechanical Installation

1. Clean the mounting hole threads thoroughly before installation.

2. Thread the PR6423/000-030-CN into the mounting hole by hand.

3. Use a wrench on the hex body only (not on the cable strain relief).

4. Set the initial air gap to 0.5 mm (20 mils) at the target surface.

5. Tighten the lock nut to secure the sensor position.

6. Apply the recommended torque (consult EPRO manual for values).

Electrical Connection

1. Connect the sensor to a compatible EPRO converter (CON 0xx series).

2. Use the correct extension cable for distances beyond 8 meters.

3. Route sensor cables separately from power cables.

4. Ground the cable shield at the converter end only.

5. Verify proper connector mating and sealing.

Initial Air Gap Setting

The PR6423/000-030-CN requires a precise 0.5 mm initial air gap. Use a feeler gauge or non-magnetic shim for setting. The output voltage at this gap should read approximately -4V DC with a standard CON converter.

Do not exceed the 2mm linear range of the Emerson EPRO PR6423/000-030-CN. Operating outside this range produces non-linear measurement data. The sensor can contact the shaft if the air gap becomes zero.

Compatible Converters

The PR6423/000-030-CN requires an EPRO converter for proper operation:

Select the appropriate converter based on your channel count requirements. All converters provide the -24V DC supply required for the PR6423/000-030-CN.

Packaging List

• 1 x Emerson EPRO PR6423/000-030-CN 8mm eddy current sensor

• 1 x 8.0 meter PTFE cable (attached)

• 1 x country-specific cable end connector (CN)

• 1 x adapter plug (factory installed)

• 1 x installation instruction sheet

Common FAQs

Q1: What is the difference between PR6423/000-030-CN and PR6423/000-030?
A1: The PR6423/000-030-CN includes a country-specific cable end connector. The standard PR6423/000-030 has a universal connector type. Electrical performance is identical between both versions.

Q2: Can the PR6423/000-030-CN measure through a non-ferromagnetic barrier?
A2: No, the Emerson EPRO PR6423/000-030-CN cannot measure through any barrier material. The eddy current field requires direct line-of-sight to the ferromagnetic target.

Q3: What happens if the operating temperature exceeds 180°C on the PR6423/000-030-CN?
A3: Operating the PR6423/000-030-CN above 180°C damages the PEEK tip and internal coil. Sensitivity shifts permanently, and output becomes unstable. Replace the sensor immediately after temperature overexposure.

Q4: Can I cut and splice the PR6423/000-030-CN cable to a different length?
A4: No, the PR6423/000-030-CN cable length is factory-calibrated. Cutting or splicing changes the cable capacitance and inductance. This alters the sensor calibration and frequency response significantly.

Q5: Which converter provides intrinsic safety (ia) certification with the PR6423/000-030-CN?
A5: The CON 021 (4-channel) and CON 041 (8-channel) converters support intrinsic safety with the Emerson EPRO PR6423/000-030-CN. Consult the converter documentation for specific ia parameters.