Product Core Brief

• Model: PR6423/00R-000
• Brand: EPRO (Emerson Machinery Health, Germany)
• Series: standard 8mm eddy current probe series for MMS3000 / A6000 turbo machinery protection
• Core Function: Non-contact eddy current probe to measure radial shaft vibration, rotor clearance, and minor axial displacement on steam/gas turbines, centrifugal compressors and critical rotating equipment
• Product Type: Standalone eddy current displacement probe (Lemo direct lock, bare cable termination code 000)
• Key Specs: M10×1 stainless housing, 8mm probe head diameter; ±1mm total 2mm linear measuring range; factory matched for 8V/mm sensitivity with CON021; integrated high-temp braided cable, Lemo quick-lock front connectorNote: Discontinued legacy API 670 machinery monitoring hardware, stocked as factory pre-calibrated New Surplus; suffix 00R = standard housing length, 000 = 0-meter bare open cable end without terminal plug, must pair with CON011 / CON021 signal preamplifier.

 

Key Technical Specifications

 

/00R-000 Probe Core Parameters

1. Mechanical Structure

• Thread Spec: M10 × 1 stainless steel housing, 25mm standard body length
• Probe Head Diameter: 8mm standard target sensing tip
• Connector: Front integrated Lemo circular self-locking plug (direct mate CON021)
• Cable Code 000: Bare open braided cable ends (no factory molded terminal plug, field custom wiring)
• Minimum cable bend radius: 50mm, no sharp crimping allowed
• IP Rating: Probe head IP67, cable braid IP65 cabinet routing

1. Measurement Performance

• Full linear measuring range: ±1mm (total 2mm span)
• Nominal midpoint installation air gap: 1.0 mm
• Standard calibrated sensitivity (matched CON021): 8 V/mm (203.2 mV/mil)
• Max linearity error: ≤ ±1% full measuring span
• Long-term zero drift: ≤0.3% FS over 12 months continuous operation
• Temperature drift: Zero point 200mV / 100K; sensitivity max 2% FS / 100K
• Frequency response: DC ~ 20kHz (-3dB), covers full turbine vibration frequency spectrum

1. Thermal & Environmental Limits

• Probe head continuous operating temp: -35°C ~ +180°C; short-term peak +200°C
• Integrated braided cable max temp rating: 200°C
• Storage & transport temperature: -40°C ~ +70°C
• Vibration resistance: 5g continuous @ 60Hz bearing housing mounting
• Pressure resistance: Uniform 2bar external cabinet / process environment

1. Compatible Matching Preamplifiers

• Primary matched unit: CON021 single-channel rack signal conditioner (MMS3000 chassis)
• Alternate compatible: CON011 compact preamplifier, CON031 / CON041 open-terminal converters
• Minimum target shaft diameter: 25mm carbon steel rotor surface; stainless/aluminum targets require site recalibration

 

Supporting Preamplifier Matching Spec (Reference)

• Power supply: 10–30VDC rack supply (standard 24VDC MMS chassis)
• Analog output: Linear voltage 0~16VDC proportional to shaft gap
• Output load requirement: ≥10kΩ input impedance for DCS/monitor cards
• Galvanic isolation between probe field circuit and rack backplane
• Cabinet operating temp: -20°C ~ +60°C

 

Mechanical Weight & Dimension

• Probe assembly net weight: 0.1kg; full kit with standard cable ~0.3kg
• rack module size: 128mm H × 25mm W × 160mm D

 

Product Introduction

This 8mm M10 eddy current probe is the standard small-size sensing element for critical turbo-machinery vibration protection systems complying with API 670 standards. It adopts non-contact inductive eddy current technology, eliminating mechanical friction and wear between the probe tip and rotating metal rotor, delivering stable long-term radial vibration and clearance monitoring for power plant steam turbines, refinery compressors and large blowers.The /00R-000 bare cable suffix (000) enables flexible on-site custom cable extension or field terminal wiring for complex marshalling cabinet layouts. When factory-calibrated and paired with a dedicated preamplifier, it outputs precise 8V/mm linear gap signals to MMS3000 monitoring racks or plant DCS safety trip logic.Independent Lemo locking plug design simplifies rapid field replacement during equipment outages; high-temperature braided cable withstands high bearing housing heat without signal attenuation, suitable for high-temperature process machinery environments.

 

QA & Testing SOP (Transparency Building)

1. Incoming Inspection: Cross-reference serial calibration numbers matching probe and compatible preamplifier batches; inspect probe tip for scratches, braided cable abrasion, cracked Lemo locking housing; verify factory anti-static packaging and calibration certificate seal integrity.
2. Live Bench Calibration Test: Mount probe on precision micrometer test jig with Fluke regulated 24VDC supply paired with ; run 24-hour continuous full ±1mm gap sweep testing, 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; validate stable Lemo connector signal transmission without intermittent dropout under vibration cycling.
4. Calibration Record Backup: Archive factory calibration certificate listing nominal air gap, sensitivity and linearity tolerance; document rack terminal wiring polarity for field maintenance reference.
5. Final QC Packaging: Attach serialized printed test pass tag with linearity test data; coil braided cable with foam separators to avoid braid abrasion, seal probe in foam-lined static-shielded bag to protect sensing tip and Lemo connector during storage and transit.

 

Installation Pitfalls & Step-by-Step Replacement Guide

❗ Calibration Matching Risk: Never cross-use probes with unmatched preamplifiers; unpaired hardware causes severe linearity deviation and invalid turbine vibration safety trip thresholds, must replace as full calibrated probe + converter set.❗ Air Gap Misadjustment Risk: Nominal midpoint installation gap = 1.0mm; gap outside 0.2~1.8mm linear window results in clipped output signals and blind shaft vibration fault conditions on safety protection systems.❗ EMI Interference Risk: Route probe braided cable fully separated from high-current VFD / motor power cables; parallel power wiring induces electromagnetic noise and triggers false DCS vibration alarms.❗ Target Material Deviation Risk: Factory calibration is for standard carbon steel rotors; stainless steel, aluminum or coated shaft surfaces require full re-calibration and shift sensitivity readings without correction.❗ ESD Circuit Damage Risk: Ungrounded technicians touching Lemo connector pins destroy internal oscillator circuits inside preamplifiers; latent ESD damage creates slow zero drift that surfaces after 2–4 weeks of continuous turbine runtime.

4-step replacement guide:

1. Pre-install LOTO: Lock out rotating machinery and 24VDC MMS rack power; attach grounded anti-static wrist strap to cabinet DIN rail ground lug; photograph existing probe mounting thread depth and Lemo connector orientation for reference.
2. Removal: Unscrew legacy probe from bearing housing mount, carefully uncoil braided cable with ≥50mm bend radius, unlock Lemo plug from old preamplifier, label field cable terminal wiring.
3. Hardware Install: Thread new /00R-000 probe into bearing mount, adjust lock nut to set 1.0mm nominal air gap measured via precision feeler gauge; route braided cable away from power cabling, terminate bare 000 cable ends to terminal block following original polarity, lock Lemo plug fully into new front port, seat preamplifier into vacant MMS rack slot.
4. Power-on Validation: Restore rack power; use micrometer gap test 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 /00R-000 measure both radial vibration and axial thrust displacement?A: It supports minor axial clearance measurement within the 2mm linear range; dedicated axial thrust monitoring requires longer-range PR6424 M18 probes with ±2mm full span, separate probes are recommended for dual radial + thrust monitoring on turbine bearing housings.Q: Does the preamplifier support hot-swapping while the MMS3000 rack remains energized?A: The rack preamplifier module can be extracted live from the chassis slot, but the probe Lemo connector must be fully disconnected first. Live unplugging of the probe cable induces oscillator circuit transients and damages the front-end signal generation hardware.Q: What warranty coverage applies to bench-tested calibrated /00R-000 probes?A: All stocked calibrated probes carry a 12-month functional warranty covering factory calibration linearity, braided cable integrity, Lemo connector and sensing coil circuit defects. Damage from improper air gap adjustment, unshielded EMI cabling, reversed converter power polarity or ungrounded ESD handling is excluded from coverage terms.Q: Is there a direct drop-in modern replacement for discontinued series probes?A: Emerson’s current EZ1080 series eddy current probes offer equivalent 8mm M10 measurement performance, but MMS3000 Lemo connector mechanical interface and sensitivity scaling differ significantly; full cabinet wiring re-termination and DCS vibration trip threshold revalidation is mandatory with no unmodified direct swap capability.Q: What minimum bend radius must be maintained for the high-temperature braided cable?A: Strictly maintain a minimum 50mm bend radius at all cable routing points; tight sharp bends crimp internal coaxial wiring and create intermittent gap signal drift during machine thermal expansion cycles.Q: Can multiple probes share a single preamplifier?A: Not supported. is a dedicated single-channel signal conditioner designed for one calibrated probe only. Additional vibration measurement points require independent full matched probe + kits per monitoring channel.Q: Can this bare 000 cable probe connect directly to third-party vibration PLC/DCS hardware without ?A: No. The eddy current probe coil requires the oscillator and signal conditioning circuit inside to generate linear gap voltage output; direct wiring to analog input cards cannot produce usable displacement readings.