Product Core Brief

• Model: PR6423/010-000-CN (Probe Assembly) + CON021 (Single Channel Preamplifier)
• Brand: EPRO (Emerson Machinery Health Monitoring, Germany, CN for China market calibrated variant)
• Series: Eddy Current Probe Series, matched with CON021 for MMS3000 / A6000 turbo machinery protection racks
• Core Function: Factory pre-matched non-contact eddy current measuring system for radial shaft vibration, rotor clearance and small-range axial displacement on steam turbines, centrifugal compressors and critical rotating equipment safety protection loops
• Product Type: Full calibrated sensing kit (M10 probe + 1m integrated high-temp cable + Lemo connector + rack-mount signal conditioner)
• Key Specs: M10×1 thread, 8mm sensing head; 1m factory integrated braided cable; ±1mm linear measuring range; 8V/mm calibrated sensitivity with ; suffix /010 = 1m cable, /000 = bare cable end, -CN = China region calibration versionNote: Discontinued legacy API 670 compliant machinery monitoring hardware, stocked as unopened factory pre-calibrated new surplus; full pair calibration eliminates on-site gain/zero adjustment during field replacement.

 

Key Technical Specifications

/010-000-CN Probe Assembly

1. Mechanical Parameters

• Thread standard: M10 × 1 stainless steel housing
• Sensing head diameter: 8mm
• Integrated cable length: 1 meter continuous high-temperature braided coaxial cable
• Cable termination code 000: Bare open cable terminals for custom cabinet marshalling wiring
• Front connector: Lemo self-locking circular plug, direct plug-and-mate with front port
• Minimum cable bend radius: ≥50mm, sharp bends forbidden
• IP rating: Probe head IP67; cable IP65 for cabinet routing

1. Measurement Performance

• Total linear measuring span: ±1mm (2mm full range)
• Recommended installation midpoint air gap: 1.0 mm
• Matched sensitivity with : 8 V/mm
• Max linearity error: ≤ ±1% full scale
• Frequency response: DC ~ 20kHz (-3dB), covers all turbine vibration frequency bands
• Zero thermal drift: 200mV / 100K; sensitivity drift ≤2% FS / 100K

1. Thermal & Environmental Limits

• Probe head continuous working temperature: -35°C ~ +180°C; transient peak +200°C
• Braided cable temperature rating: Max 200°C
• Storage temperature: -40°C ~ +70°C
• Vibration resistance: 5g continuous at 60Hz bearing housing mounting
• Working ambient pressure: Up to 2bar external environment
• Minimum target steel shaft diameter: 25mm carbon steel (stainless/aluminum targets require field recalibration)

Matching Preamplifier

• Input power: 10–30 VDC 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; load impedance ≥10kΩ for DCS/monitor cards
• Galvanic isolation between field probe circuit and rack backplane
• 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

Combined Kit Mechanical Data

• Probe assembly weight: ~0.12kg
• dimensions: 128mm H × 25mm W × 160mm D; weight ~0.38kg

 

Product Introduction

This -CN regional calibrated full kit is targeted for domestic power plant and petrochemical turbo-machinery protection projects, consisting of a 1-meter cable M10 eddy current probe and a dedicated signal conditioner factory calibrated as a matched set. The eddy current non-contact measurement principle avoids mechanical friction and wear between probe tip and rotating shaft, delivering stable long-term radial vibration monitoring for large rotating equipment.The 1-meter factory integrated cable simplifies short-distance bearing housing wiring layouts; bare 000 cable ends support flexible terminal wiring inside marshalling cabinets without additional intermediate connectors. The internal oscillator and conditioning circuit converts tiny coil inductance changes into standard linear 8V/mm analog signals, compatible with MMS3000 monitoring racks, PLC and DCS safety trip logic.Matched pair calibration removes the need for precision micrometer gap calibration during maintenance shutdowns, greatly shortening equipment downtime for vibration sensor replacement. Widely applied on steam turbines, centrifugal compressors, large blowers and other API 670 critical rotating machinery protection systems.

 

QA & Testing SOP (Transparency Building)

1. Incoming Inspection: Match serial numbers printed on /010-000-CN probe and calibration certificate; inspect probe tip for scratches, braided cable abrasion, cracked Lemo locking shell and rack connector pins; 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 gap sweep test over full ±1mm measuring range, record linearity error, zero drift and 8V/mm sensitivity output under 25°C and 60°C simulated cabinet temperature.
3. Electrical Insulation Test: Megger insulation resistance >10MΩ between cable shield and rack ground; perform vibration cycle test to confirm Lemo connector maintains stable signal without intermittent dropout.
4. Calibration Record Backup: Archive original factory calibration certificate recording nominal air gap, sensitivity and linearity tolerance; document rear terminal wiring polarity for field maintenance reference.
5. Final QC Packaging: Attach serialized printed test pass tag with linearity test data; coil the 1m cable with foam separators to prevent braided wire abrasion; seal the full kit in foam-lined static-shielded bag to protect the sensing tip and rack module during storage and transit.

 

Installation Pitfalls & 4-Step Replacement Guide

❗ Calibration Matching Risk: Probe and preamplifier must be used as a complete factory-matched kit. Cross-matching with unmatched modules will cause severe linearity deviation, leading to invalid turbine vibration safety trip thresholds.❗ Air Gap Misadjustment Risk: Standard midpoint installation gap = 1.0mm. Operating 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 1m 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 is only valid for 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 Lemo connector pins will damage the 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; take photos to record the original probe mounting thread depth and Lemo connector orientation for reference.
2. Removal: Unscrew the old probe from the bearing housing mount; carefully uncoil the 1m cable while maintaining ≥50mm bend radius; unlock the Lemo plug from the legacy ; label all field cable terminal wiring.
3. Hardware Install: Thread the new /010-000-CN probe into the bearing mount; adjust the lock nut to set a 1.0mm nominal air gap with a precision feeler gauge; route the 1m braided cable away from power wiring; terminate the bare 000 cable ends to the terminal block following original polarity; fully lock the Lemo plug into the front port of the new ; insert the preamplifier into an empty MMS rack slot.
4. Power-on Validation: Restore rack power; use the micrometer gap jig to verify linear 8V/mm output across the 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 this /010-000-CN kit be used for both radial vibration and axial thrust displacement measurement?A: It can only measure small-range axial clearance within the ±1mm span. Long-range axial thrust monitoring requires the 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 hot extraction from the live slot, but the Lemo probe connector must be fully disconnected first. Live unplugging of the probe cable generates transient voltage spikes that damage the front-end oscillator circuit.Q: What warranty coverage applies to bench-tested calibrated /010-000-CN + full kits?A: All stocked calibrated kits carry a 12-month functional warranty covering factory calibration linearity, cable integrity, Lemo connector and preamplifier signal processing 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 kit?A: Emerson’s current EZ1080 M10 eddy current probe provides equivalent measurement performance, but the Lemo mechanical interface, rack pinout and 8V/mm sensitivity scaling are inconsistent. Full cabinet wiring re-termination and DCS vibration trip threshold revalidation are required with no unmodified direct swap solution.Q: Can multiple probes share a single preamplifier?A: Not supported. is a single-channel dedicated signal conditioner designed for one matched probe only. Additional vibration measurement points require independent full matched probe + kits for each channel.Q: Can the bare 000 cable end be directly connected to DCS analog input cards without ?A: Impossible. The eddy current probe coil relies on the oscillator and conditioning circuit inside to generate linear gap voltage output; direct wiring to AI cards cannot produce usable displacement measurement signals.Q: What does the suffix -CN stand for on /010-000-CN?A: -CN indicates the China domestic market calibrated variant, with factory calibration parameters conforming to local power and petrochemical industry standard acceptance criteria; measurement performance and compatibility with remain identical to standard global versions.