Emerson epro PR6424/003-030 Eddy Current Displacement Sensor

Product Overview

The Emerson epro PR6424/003-030 is a heavy-duty, non-contact eddy current sensor designed for measuring shaft displacement and vibration in large-scale rotating machinery. Featuring a 12mm tip diameter, this sensor provides a significantly larger linear measuring range than standard 8mm probes, making it the industry standard for monitoring axial thrust and differential expansion in large steam and gas turbines. We supply this unit as 100% Brand New and Original with full factory certification.

Part Number Breakdown

The PR6424 alphanumeric code defines the specific physical configuration of the probe assembly:

• PR6424: Series designation for 12mm diameter high-sensitivity eddy current sensors.

• 003: Specifies a 5.0-meter integrated cable length (without additional armoring).

• 030: Defines the mechanical mounting hardware, typically an M14x1.5 threaded body with specific stud lengths for deep-well bearing housing installation.

Technical Specifications

• Sensor Tip Diameter: 12 mm.

• Measurement Principle: Non-contact eddy current.

• Linear Range: 4.0 mm (standard range from 1.0 mm to 5.0 mm distance from target).

• Target Material: Ferromagnetic steel (Standard target: 1.7225 / AISI 4140).

• Temperature Range: -35 to +180 °C at the sensor head.

• Pressure Resistance: Up to 5 bar (72.5 psi) at the sensor tip.

• Frequency Response: 0 Hz (DC) to 10 kHz.

Engineering Advantages

The PR6424/003-030 addresses the challenge of monitoring large-scale thermal growth in power generation equipment. The 12mm tip generates a wider electromagnetic field, allowing the sensor to track shaft movements over a 4mm span without losing linearity. This is critical for preventing "rubs" between the rotor and stator during startup and shutdown cycles. The 5-meter integrated cable facilitates direct routing to local junction boxes without the signal loss associated with intermediate connectors. Hermetically sealed and oil-resistant, this sensor maintains sub-micron precision even when submerged in lubricating oil or exposed to high-velocity steam environments.

FAQs

• Why use the 12mm PR6424 instead of the 8mm PR6423?The PR6424 offers double the linear measurement range (4mm vs 2mm). This makes it essential for monitoring axial thrust position or differential expansion where the expected movement exceeds the capacity of an 8mm probe.

• Is the 5-meter cable length fixed?Yes, the "003" code signifies a 5.0m cable. Since eddy current systems are calibrated based on the total electrical length (sensor cable + extension cable), you must ensure your driver is matched for this specific 5m configuration.

• How do I verify the target material compatibility?Standard calibration is for AISI 4140 steel. If your shaft is made of a different alloy (e.g., stainless steel or chrome-moly), the voltage-to-gap curve will shift, and the driver must be recalibrated for that specific material.

• What mounting precautions should I take?Ensure the mounting bracket is rigid. Any vibration in the sensor bracket itself will be interpreted as shaft vibration, creating "false" alarms in your monitoring system.