Product Core Brief

• Model: /006-131
• Brand: EPRO (Emerson / formerly Bently Nevada alternative)
• Series: Series (8mm Eddy Current Sensor)
• Core Function: Non-contact eddy current proximity probe for continuous radial vibration, axial displacement, and keyphasor measurement on rotating machinery.
• Product Type: Eddy Current Vibration / Displacement Probe
• Key Specs: 8mm Diameter | ±2mm Linear Range | 4 V/mm Sensitivity | M10 Thread
• Condition: New Surplus / OEM Original

EPRO PR6423/006-131

Key Technical Specifications

• Sensor Type: 8mm Eddy Current Probe
• Linear Range: ±2 mm (4 mm total)
• Sensitivity: 4 V/mm (8 mV/μm)
• Recommended Gap Setting: 1.5 mm (to the midpoint of the measuring range)
• Thread Size: M10 × 1
• Cable Length: 1.0 Meter integrated cable (denoted by /006)
• Connector Type: LEMO Plug (denoted by -131)
• Operating Temperature: -35°C to +180°C (Cable up to +200°C)
• Target Material: Conductive metals (Standard calibration: 42CrMo4 / SAE 4140 Steel)
• Compliance: API 670, DIN 45670, ISO 10817-1

Product Introduction

Serving as the primary sensing element in the EPRO MMS 3000 and MMS 6000 machinery protection ecosystems, the /006-131 is an 8mm eddy current probe designed for high-precision dynamic and static position monitoring. Utilizing high-frequency electromagnetic field modulation, it detects rotor imbalances, misalignment, bearing wear, and axial shifts before they escalate into catastrophic failures.

This specific model features a 1.0-meter integrated cable terminating in a LEMO connector, designed for secure, vibration-resistant mating with the extension cable or directly to the CON011/CON021 preamplifier. The series is factory-calibrated to 42CrMo4 steel, making it ideal for power generation, petrochemical, and heavy industrial applications across global markets.

QA & Testing SOP

Vibration probes are highly sensitive to physical damage and electrical degradation. We verify mechanical and electrical integrity before release.

1. Anti-Counterfeit & Visual Audit: We inspect the stainless steel housing for corrosion, verify the EPRO laser etching, and check the LEMO connector for bent center pins or damaged locking threads.
2. Cable Continuity & Shield Test: We perform a low-resistance sweep on the coaxial core and verify the braided shield has zero breaks, ensuring EMI noise won’t corrupt the microvolt-level vibration signals.
3. Impedance & Sensitivity Validation: Using an OEM test rig, we verify the probe’s electrical characteristics match the 4 V/mm sensitivity spec and confirm the linear range is free from dead zones.
4. Connector Mating Test: We mate the LEMO connector with a standard extension cable to verify it locks securely and maintains consistent electrical contact under simulated vibration.
5. ESD Safe Packaging: The internal coil assembly is sensitive to static discharge. We pack the probe in anti-static shielding with desiccant to prevent latent dielectric breakdown.

EPRO PR6423/006-131

Installation Pitfalls & Guide

❗ System Length Matching: This probe has a 1.0m integrated cable. When paired with an extension cable, the total system length must exactly match the CON021/CON011 preamplifier’s configured system length. Mismatched system lengths will cause severe calibration errors and false trips.

❗ Gap Voltage Calibration: The recommended initial gap is 1.5 mm, which typically corresponds to -10 VDC at the preamplifier output. Never guess the gap; always use a multimeter to verify the exact DC voltage during installation. An incorrect gap pushes the sensor out of its linear range, causing clipped waveforms and false alarms.

❗ Single-Point Grounding: The coaxial shield must be grounded at the preamplifier end only. Grounding at both the probe and preamplifier creates a ground loop that injects 50/60Hz hum directly into your vibration readings.

❗ Target Material: The series is calibrated for 42CrMo4 steel. If measuring non-magnetic or exotic alloys, the sensitivity may vary, and field gap adjustments will be required.

Replacement SOP:

1. Pre-Install: Record the existing gap voltage and alarm setpoints; place the machine in bypass/maintenance mode.
2. Removal: Disconnect the extension cable; unthread the old probe from the bracket; clean the mounting hole.
3. Install: Thread the new /006-131 into the bracket; connect the extension cable; route away from high-EMI sources (VFDs, motor leads).
4. Power-On Test: Apply power to the preamplifier; adjust the probe gap until the output reads -10 VDC ± 0.2V; verify DCS vibration readings are stable before removing bypass.

Technical FAQ

What does the “/006-131” suffix mean?
The “/006” designates the integrated cable length (1.0 meter). The “-131” indicates the connector type (LEMO plug). Other common variants include “-030” (bare wire) or “-110” (different cable/connector configurations). Always match the exact suffix to your existing system setup.

What preamplifier is compatible with this probe?
The series is specifically designed to pair with EPRO CON011 or CON021 preamplifiers. Mixing different probe series (e.g., PR6424) with a CON021 preamplifier will result in incorrect sensitivity and false readings.

Can I use this probe for high-temperature applications?
This is a standard temperature probe rated to +180°C. If your application exceeds this (e.g., steam turbines, gas turbines with hot lube oil), you should upgrade to a high-temperature variant rated to +380°C.

What is the minimum shaft diameter for accurate measurement?
EPRO recommends a minimum target shaft diameter of 25mm for the 8mm probe to ensure the eddy current field is fully contained and the calibration remains accurate. For smaller shafts, consider using a 6mm probe system.

Why is this sold as new surplus?
This unit was pulled from sealed OEM overstock or an unfulfilled project before installation. We perform full electrical validation on our test rigs, but we aren’t replacing the internal coil or re-calibrating the sensitivity. You are getting unused factory components with original manufacturing tolerances at a fraction of the active OEM list price.