Product Core Brief

• Model: PR6423/003-030-CN
• Brand: EPRO (Emerson Machinery Health Monitoring, Germany; -CN = China region calibrated version)
• Series: M10 8mm eddy current probe series for MMS3000 / A6000 turbo machinery protection racks
• Model Code Breakdown: M10×1 thread, 8mm sensing head, ±1mm linear full range for radial vibration/003: 3 meters factory integrated high-temperature braided coaxial cable-030: Bare stripped open cable terminals, no molded Lemo plug, field terminal wiring required-CN: Factory calibrated per Chinese power & petrochemical industry acceptance standards
• Core Function: Non-contact eddy current sensor to measure radial shaft vibration and rotor clearance on steam/gas turbines, centrifugal compressors and critical rotating equipment safety protection loops, fully API 670 compliant
• Product Type: Complete probe assembly (M10 probe head + 3m integrated high-temp braided cable + bare open wire ends)
• Key Specs: M10×1 stainless housing, 8mm sensing tip; ±1mm linear measuring span; factory calibrated 8V/mm sensitivity matched for CON021; 3m PTFE high temperature cable, bare cable terminal design for custom cabinet wiringNote: Discontinued legacy machinery monitoring hardware, stocked as unopened factory calibrated new surplus; must pair with CON021 single-channel rack preamplifier to output linear gap voltage signals.

 

Key Technical Specifications

/003-030-CN Probe Assembly

1. Mechanical Parameters

• Thread standard: M10 × 1 stainless steel housing
• Sensing head diameter: 8mm standard target sensing tip
• Integrated cable length: 3m continuous high-temperature braided coaxial cable
• Cable suffix -030: Bare stripped coaxial wire ends, no factory Lemo molded plug, field terminal wiring to CON021/CON031
• Minimum cable bend radius: ≥50mm, sharp tight bends will damage internal coaxial core and cause signal drift
• IP rating: Probe head IP67; braided cable IP65 for cabinet internal routing

1. Measurement Performance

• Full linear measuring range: ±1mm (total 2mm span)
• Recommended installation nominal midpoint air gap: 1.0 mm
• Calibrated sensitivity (matched CON021): 8 V/mm
• Max linearity error: ≤ ±1% full scale
• Frequency response: DC ~ 20kHz (-3dB), covers all turbine vibration frequency bands
• Thermal drift: Zero point drift 200mV / 100K; sensitivity drift ≤2% FS / 100K
• Long-term zero drift: ≤0.3% FS over 12 months continuous operation

1. Thermal & Environmental Limits

• Probe head continuous operating temperature: -35°C ~ +180°C; short-term peak +200°C
• Braided cable temperature rating: Max 200°C PTFE insulation
• Storage & transport temperature: -40°C ~ +70°C
• Vibration resistance: 5g continuous vibration at 60Hz bearing housing mounting
• Working ambient pressure: Uniform 2bar external environment
• Minimum target carbon steel shaft diameter: 25mm; stainless steel/aluminum coated rotors require on-site recalibration

Matching CON021 Preamplifier Reference Spec

• Power supply: DC 10–30 V rack supply (standard 24VDC MMS3000 chassis)
• Probe excitation: -26.75 VDC short-circuit protected sensor power
• Analog output: Linear 0~16VDC voltage proportional to shaft gap; receiving device load impedance ≥10kΩ
• Galvanic isolation between field probe circuit and rack backplane bus
• Cabinet operating temperature: -20°C ~ +60°C
• Form factor: Single-slot 3U DIN41612 rack plug-in module
• PCB protection: Full acrylic conformal coating for refinery/offshore corrosive cabinet atmospheres

Mechanical Weight & Dimension

• Probe assembly net weight: ~0.18kg
• module dimensions: 128mm H × 25mm W × 160mm D; weight ~0.38kg

 

Product Introduction

This -CN regional calibrated 3-meter bare wire M10 eddy current probe is widely matched with preamplifiers for domestic power plant and petrochemical turbo machinery radial vibration protection systems. The non-contact eddy current measurement principle eliminates mechanical friction and wear between probe tip and rotating metal rotor, realizing long-term stable radial vibration monitoring for large rotating equipment.The 3-meter factory integrated braided cable adapts to medium-distance wiring layouts between bearing housings and marshalling cabinets; bare -030 open wire terminals support flexible terminal wiring inside cabinets without fixed Lemo plug limitation, convenient for complex multi-layer cabinet wiring design. The -CN calibration version adopts local industry standard acceptance parameters, consistent measurement performance with global standard models.After factory matched calibration with signal conditioner, the probe converts tiny coil inductance changes into standard linear 8V/mm analog signals, which can be transmitted to MMS3000 monitoring racks, PLC and DCS safety trip interlock logic for vibration protection judgment. Matched calibration eliminates on-site micrometer zero/gain adjustment during maintenance shutdowns, reducing equipment downtime for sensor replacement.Typical application: Steam turbines, gas turbines, centrifugal compressors, large blowers and other API 670 critical rotating machinery radial vibration measurement points.

 

QA & Testing SOP (Transparency Building)

1. Incoming Inspection: Cross-reference serial calibration numbers on probe and factory calibration certificate; inspect 8mm probe tip for scratches, braided cable insulation abrasion, bare wire core breakage; verify original anti-static packaging and calibration certificate seal integrity.
2. Live Bench Calibration Test: Mount probe on precision micrometer test jig, powered by Fluke stabilized 24VDC supply paired with matched ; run 24-hour continuous full ±1mm gap sweep test, record linearity error, zero thermal drift and 8V/mm sensitivity output at 25°C and 60°C simulated cabinet temperature.
3. Electrical Insulation Test: Megger insulation resistance >10MΩ between cable shield and rack ground; vibration cycle test confirms bare wire terminal connection maintains stable signal without intermittent dropout.
4. Calibration Record Backup: Archive factory calibration certificate recording nominal air gap, sensitivity and linearity tolerance; document rear terminal block wiring polarity for field maintenance reference.
5. Final QC Packaging: Attach serialized printed test pass tag with linearity test data; coil the 3m braided cable with foam separators to avoid braided wire abrasion; seal probe in foam-lined static-shielded bag to protect sensing tip during storage and transit.

 

Installation Pitfalls & 4-Step Replacement Guide

❗ Calibration Matching Risk: Probe and preamplifier must be used as a complete factory-matched set. Cross-matching unmatched will cause severe linearity deviation, leading to invalid turbine vibration safety trip thresholds.❗ Air Gap Misadjustment Risk: Standard midpoint installation gap = 1.0mm. Operation outside the 0.2mm ~ 1.8mm linear window will clip analog output signals and create blind vibration fault conditions for safety protection systems.❗ EMI Interference Risk: Route the 3m probe cable completely separated from high-current VFD and motor power cables; parallel power wiring induces electromagnetic noise and triggers false vibration alarms on DCS monitoring screens.❗ Target Material Deviation Risk: Factory calibration only applies to standard carbon steel rotors. Stainless steel, aluminum or coated shaft surfaces change measurement sensitivity and require full on-site recalibration.❗ ESD Circuit Damage Risk: Ungrounded technicians touching bare cable terminals will damage internal oscillator circuit inside ; latent ESD damage causes slow zero drift that appears after 2–4 weeks of continuous turbine operation.

4-step replacement guide:

1. Pre-install LOTO: Lock out rotating machinery and MMS3000 rack 24VDC power; attach grounded anti-static wrist strap to cabinet DIN rail ground bar; photograph original probe mounting thread depth and rear terminal wiring polarity for reference.
2. Removal: Unscrew old probe from bearing housing mount; carefully uncoil the 3m cable while maintaining ≥50mm bend radius; disconnect bare wire terminals from legacy terminal block, label all rack power and signal wiring.
3. Hardware Install: Thread new /003-030-CN probe into bearing mount; adjust lock nut to set 1.0mm nominal air gap via precision feeler gauge; route 3m braided cable away from power wiring; terminate bare -030 cable ends to new rear terminal block following original polarity; insert into empty MMS rack slot and fasten front locking screws.
4. Power-on Validation: Restore rack power; use micrometer gap jig to verify linear 8V/mm output across full ±1mm travel range; access MMS/DCS monitoring screens to confirm stable zero offset, no noise spikes and valid radial vibration readings without false safety alarms.

 

FAQ

Q: Can /003-030-CN measure both radial vibration and axial thrust displacement?A: It only supports small-range axial clearance within the ±1mm span. Long-range axial thrust monitoring requires PR6424 M18 series probe with ±2mm full linear range; separate dedicated probes are recommended for simultaneous radial + thrust monitoring on turbine bearing housings.Q: Does the preamplifier support hot-swapping while the MMS3000 rack remains energized?A: The rack module supports live slot extraction, but all bare probe cable terminals must be fully disconnected from the terminal block first. Live disconnection of probe wiring generates inductive voltage transients that damage the preamplifier internal oscillator circuit.Q: What warranty coverage applies to bench-tested calibrated /003-030-CN probes?A: All stocked calibrated probes carry a 12-month functional warranty covering factory calibration linearity, cable integrity, bare terminal and internal sensing coil circuit defects. Damage caused by improper air gap adjustment, unshielded EMI wiring, reversed power polarity or ungrounded ESD handling is excluded from warranty coverage.Q: Is there a direct drop-in modern replacement for this discontinued -CN series probe?A: Emerson’s current EZ1080 M10 eddy current probe provides equivalent measurement performance, but rack pinout, bare cable terminal wiring and 8V/mm sensitivity scaling are inconsistent. Full cabinet wiring re-termination and DCS vibration trip threshold revalidation are mandatory with no unmodified direct swap solution.Q: What is the difference between suffix -030 and -010 on probes?A: -030 = bare stripped open cable wire ends, manual terminal wiring to /CON031 preamplifiers; -010 = factory molded Lemo self-locking plug, direct plug-and-play front port connection for without field wiring.Q: Can multiple probes share a single preamplifier?A: Not supported. is a single-channel dedicated signal conditioner designed for one calibrated probe only. Additional vibration measurement points require independent full matched probe + kits for each channel.Q: What does -CN suffix stand for on /003-030-CN?A: -CN indicates China domestic market calibrated variant, factory calibration parameters comply with local power and petrochemical industry acceptance standards; hardware measurement performance and compatibility are identical to standard global versions.