Description

1. Emerson PR6424/011-140 | Stainless Steel Eddy Current Sensor, High Temperature Machinery Monitoring

Product Core Brief

• Model: PR6424/011-140
• Brand: Emerson (EPRO AMS)
• Series: PR6424 Eddy Current Sensor Family
• Core Function: Non-contact measurement of shaft vibration, axial position, eccentricity and rotational speed
• Type: 16 mm Eddy Current Probe
• Key Specs: Static measuring range ±2.0 mm; Nominal air gap 2.7 mm; Sensitivity 4 V/mm; Compatible with CON021 converter Condition: New Surplus, not refurbished ⚠️ Requires matching signal converter; cannot operate independently.

Product Introduction

Unplanned trips caused by loss of shaft vibration signals remain a major risk for large turbomachinery. The Emerson PR6424/011-140 is a 16 mm eddy current probe designed for heavy-duty rotating equipment monitoring.

Unlike smaller 8 mm probes, this variant fits applications with larger shaft diameters above 80 mm. It delivers stable linear output under high temperature and continuous vibration conditions. When paired with a CON021 converter, it forms a complete measuring chain compliant with API 670 standards. Field records confirm consistent performance over long-term operation, with certified operating temperature up to 180 °C at the probe head.

Key Technical Specifications

Emerson PR6424/011-140

Installation & Configuration Guide

Phase 1: Pre-Installation (Estimated 12 min)

⚠️ Safety Reminders

1. Coordinate with operation staff; sensor replacement interrupts machinery protection signals.
2. Lock out rotating equipment and confirm rotor stays static during installation.

Tools required

• Anti-static wrist strap and anti-static mat
• Spanner for M18 mounting nuts
• Digital multimeter, gap gauge
• Mobile phone for photo documentation

Preparation work

• Record existing air gap value of the old probe.
• Take photos of cable routing, mounting bracket orientation.
• Confirm signal converter model is CON021 before fitting new probe.

Phase 2: Old Probe Removal (Estimated 10 min)

1. Confirm machine is locked and powered down.
2. Disconnect the probe cable connector from the converter terminal.
3. Loosen the lock nut on the probe mounting sleeve.
4. Unscrew and extract the probe slowly. Do not scrape the shaft surface.
5. Inspect rotor measuring collar for scratches, corrosion or uneven surface.

⚠️ Surface damage on the target collar will permanently degrade measurement linearity.

Phase 3: New Probe Installation (Estimated 15 min)

1. Wear anti-static protection before unpacking the sensor.
2. Verify part number PR6424/011-140.
3. Thread the probe into mounting sleeve, adjust to target air gap (2.7 mm nominal).
4. Secure the lock nut firmly without over-tightening.
5. Route the cable to avoid contact with hot surfaces and moving parts. Maintain proper cable bend radius.

Self-check list [ ] Air gap calibrated to specified value [ ] Lock nut fully tightened [ ] Cable free from sharp edges and thermal zones [ ] No mechanical contact between probe and rotor

Phase 4: Commissioning & Calibration (Estimated 25 min)

Pre-test inspection

• Check cable continuity between probe and CON021 converter.
• Confirm no short-circuit on signal wiring.

Commissioning steps

1. Energize monitoring system, do not start rotating machinery.
2. Read DC gap voltage from converter output terminal. Adjust probe position until voltage matches nominal air gap.
3. Verify linear output by gently moving the probe within measuring range.
4. Confirm vibration signal is detected after system startup.
5. Run continuous monitoring for minimum 30 minutes. Check for signal drift or noise spikes.
6. Record probe serial number, air gap value and installation date into maintenance logs.

Troubleshooting tips

• No signal output: Check connector wiring and confirm compatibility with CON021.
• Excessive signal noise: Inspect cable routing, separate from power cables.
• Poor linearity: Verify target material and surface condition of rotor collar.

Frequently Asked Questions (FAQ)

1. Can PR6424/011-140 work with CON011 converter? Hardware connection is possible, but sensitivity and linearity parameters mismatch. Measurement errors will occur. Only use CON021 converter for this probe model.
2. Can I replace an 8 mm PR6423 probe directly with this PR6424 model? Mounting thread and measuring range differ. Shaft diameter must be ≥80 mm. The system configuration in monitoring software needs sensitivity parameter modification. Direct swap without calibration causes wrong readings.
3. Does this probe support hot replacement while the turbine is running? Physical cable disconnection can be performed, but vibration protection will be lost during replacement. A scheduled shutdown is strongly recommended to avoid machine trip risks.
4. What happens if the air gap drifts outside the linear range? The output voltage will deviate from linear characteristics. The monitoring system will trigger gap alarm and vibration data becomes unreliable. Regular gap inspection is required.
5. What warranty coverage is offered for PR6424/011-140? All probes pass continuity and bench linearity testing before shipment. We provide a 12-month warranty. Test photos and inspection records can be shared upon request.
6. Can this probe measure non-ferrous metal shafts? Linear performance will degrade significantly. Ferromagnetic steel is required to meet published specifications. Contact engineering if target material cannot be changed.
7. Is armored cable available for this model? PR6424 ordering code defines cable options. PR6424/011-140 comes with standard unarmored PTFE cable. Confirm cable specification before ordering spares.