Product Core Brief

• Model: PR6423/010-010 (Probe Assembly) + CON021 (Single Channel Rack Preamplifier)
• Brand: EPRO (Emerson Machinery Health Monitoring, Germany)
• Series: M10 eddy current probe series, factory calibrated matched set for MMS3000 / A6000 turbo machinery protection racks
• Model Code Decode = M10×1 thread, 8mm sensing head, ±1mm linear span for radial shaft vibration/010 = 1 meter factory integrated high-temperature PTFE braided coaxial cable-010 = Standard non-armored braided cable + one-piece molded Lemo self-locking plug, direct plug-and-play front port connection for CON021
• Core Function: Factory pre-calibrated non-contact eddy current measuring system for radial shaft vibration, rotor clearance and minor axial clearance on steam/gas turbines, centrifugal compressors and critical rotating equipment SIL safety protection loops, fully compliant with API 670 machinery protection standard
• Product Type: Full standard sensing kit (M10 probe head + 1m integrated braided cable + molded Lemo plug + rack-mount signal converter)
• Key Specs: M10×1 stainless steel housing, 8mm sensing tip; ±1mm linear measuring range; factory calibrated 8V/mm sensitivity matched exclusively with ; 1m short-distance standard PTFE high-temperature cable, integrated Lemo plug no field wiring requiredNote: Discontinued legacy machinery monitoring hardware, stocked as unopened factory calibrated new surplus; probe and must be used as a matched calibrated set to guarantee linear measurement accuracy

 

Key Technical Specifications

 

/010-010 Probe Assembly

1. Mechanical Structure

• Thread standard: M10 × 1 stainless steel mounting housing
• Sensing head diameter: 8mm standard target sensing tip, narrow bearing housing compatible
• Integrated cable length: 1m continuous high-temperature PTFE braided coaxial cable
• Cable suffix -010: Ordinary soft braided cable + molded Lemo self-locking circular plug, directly insert front port without terminal wiring
• Minimum cable bend radius: ≥50mm, sharp tight bends damage internal coaxial core and cause signal drift
• IP rating: Probe head IP67; braided cable IP65 for clean cabinet internal routing

2. Measurement Performance

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

3. Thermal & Environmental Limits

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

 

Matched Single Channel Preamplifier Reference Parameters

• Input power supply: DC 10–30 V rack supply (standard 24VDC MMS3000 monitoring chassis)
• Probe excitation output: -26.75 VDC short-circuit protected sensor excitation power
• Analog output signal: Linear buffered voltage 0~16VDC proportional to shaft gap; receiving DCS/monitor card load impedance ≥10kΩ
• Galvanic isolation: Complete isolation between field probe measuring circuit and rack backplane bus to eliminate ground loop noise
• Cabinet operating temperature: -20°C ~ +60°C
• Form factor: Single-slot 3U DIN41612 standard 19” rack plug-in module
• PCB protection: Full acrylic conformal coating for offshore and refinery corrosive cabinet atmospheres

 

Combined Kit Mechanical Data

• /010-010 probe assembly net weight: ~0.12kg
• module dimensions: 128mm H × 25mm W × 160mm D; weight ~0.38kg

 

Product Introduction

This 1-meter standard Lemo plug M10 eddy current matched kit is the most widely used short-distance vibration sensor for power plant and petrochemical turbo machinery bearing housings complying with API 670 standards. Adopting non-contact eddy current induction measurement principle, there is no mechanical friction and wear between the probe tip and rotating metal rotor, realizing long-term stable radial vibration monitoring for large rotating equipment.The /010 code stands for 1m factory integrated cable, suitable for bearing housings within 1m distance from marshalling cabinets, compact layout and easy routing. The molded Lemo plug (-010) realizes plug-and-play docking with preamplifier, eliminating on-site cable stripping and terminal wiring work, greatly reducing on-site wiring error risks and maintenance time.After factory matched calibration with dedicated signal conditioner, the probe converts tiny coil inductance changes into standard linear 8V/mm analog signals, which can be stably transmitted to MMS3000 monitoring racks, PLC and DCS safety trip interlock logic for vibration protection judgment. Matched pair calibration eliminates on-site micrometer zero/gain adjustment during maintenance shutdowns, shortening turbine downtime for sensor replacement.Typical application scenarios: Steam turbines, gas turbines, centrifugal compressors, large blowers and other critical rotating machinery radial vibration measurement points with short-distance clean cable routing environment.

 

QA & Testing SOP (Transparency Building)

1. Incoming Inspection: Cross-reference unique serial calibration numbers printed on probe and factory calibration certificate; inspect 8mm probe tip for scratches, braided cable insulation abrasion, cracked molded Lemo plug shell and internal pin deformation; verify original anti-static packaging and calibration certificate seal integrity.
2. Live Bench Calibration Test: Mount probe on precision micrometer gap test jig, powered by Fluke stabilized 24VDC regulated supply paired with matched ; run 24-hour continuous full ±1mm gap sweep testing, record linearity error, zero thermal drift and 8V/mm sensitivity output under 25°C room temp and 60°C simulated cabinet operating temperature.
3. Electrical Insulation Test: Megger insulation resistance >10MΩ between cable shield and rack ground; perform cable bending vibration cycle test to confirm molded Lemo connector maintains stable signal without intermittent dropout.
4. Calibration Record Backup: Archive original factory calibration certificate recording nominal midpoint air gap, calibrated 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 full linearity test data; coil the 1m braided cable with foam separators to avoid braided wire extrusion abrasion; separate probe and preamplifier with foam padding to prevent scratching sensing tip, seal complete kit in foam-lined static-shielded bag for warehouse storage and transit protection.

 

Installation Pitfalls & 4-Step Replacement Guide

❗ Calibration Matching Risk: Probe and preamplifier must be deployed as a complete factory-matched kit. Cross-matching with unmatched units will cause severe linearity deviation, resulting in invalid turbine vibration safety trip threshold judgment.❗ Air Gap Misadjustment Risk: Standard nominal 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 on critical SIL safety protection systems.❗ Cable Bending Damage Risk: Strictly maintain ≥50mm minimum bend radius; excessive small-radius bending will permanently damage internal coaxial core, causing irreversible long-term signal drift.❗ EMI Interference Risk: Route all probe coaxial cable completely separated from high-current VFD and motor power cables; parallel power wiring induces electromagnetic noise and triggers false vibration alarm signals on DCS monitoring screens.❗ ESD Circuit Damage Risk: Ungrounded technicians touching Lemo connector pins will damage the internal oscillator circuit inside the preamplifier; latent ESD damage causes slow zero drift that emerges after 2–4 weeks of continuous turbine runtime.

4-step replacement guide:

1. Pre-install LOTO: Lock out rotating turbine machinery and MMS3000 rack 24VDC power supply; attach grounded anti-static wrist strap to cabinet DIN rail ground bus; photograph original probe mounting thread depth and Lemo connector orientation for reference.
2. Removal: Unscrew legacy M10 probe from bearing housing mount; slowly uncoil the 1m braided cable while maintaining ≥50mm minimum bend radius; unlock molded Lemo plug from old front port, extract preamplifier from rack slot and label all rack power/signal wiring.
3. Hardware Install: Thread new /010-010 probe into bearing mount; adjust lock nut to set 1.0mm nominal air gap measured via precision feeler gauge; route 1m braided cable away from high-current power wiring, avoid sharp metal pipeline edges scratching cable outer braid; fully lock molded Lemo plug into front port of new ; insert into empty MMS rack slot and fasten front locking screws.
4. Power-on Validation: Restore rack power supply; use micrometer gap test jig to verify linear 8V/mm analog 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 interlock alarms.

 

FAQ

Q: Can /010-010 simultaneously measure radial vibration and axial thrust displacement?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: What is the difference between suffix -010, -030 and -110 of probes?A:

• -010: Ordinary PTFE braided cable + molded Lemo plug, standard clean cabinet short-distance wiring, plug-and-play
• -030: Ordinary braided cable + bare stripped open wire ends, need manual terminal wiring to rear terminals
• -110: Stainless steel metal armored cable + molded Lemo plug, anti-scratch for harsh mechanical friction/oil splash environments

Q: Does the preamplifier support hot-swapping while the MMS3000 rack remains energized?A: The rack module supports live slot extraction, but the Lemo probe connector must be fully disconnected first. Live unplugging of the probe cable generates inductive voltage transients that damage the preamplifier internal oscillator circuit.

Q: What warranty coverage applies to bench-tested calibrated /010-010 + full kits?A: All stocked calibrated kits carry a 12-month functional warranty covering factory calibration linearity, 1m braided cable integrity, molded Lemo connector and preamplifier signal processing circuit defects. Damage caused by improper air gap adjustment, excessive small-radius cable bending, unshielded EMI wiring, reversed rack power polarity or ungrounded ESD handling is excluded from warranty coverage.

Q: Is there a direct drop-in modern replacement for this discontinued series kit?A: Emerson’s current EZ1080 M10 eddy current probe provides equivalent measurement performance, but rack pinout, Lemo mechanical interface 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: 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 for each monitoring channel.

Q: What scenario is /010-010 1m Lemo plug model suitable for?A: Bearing housing and marshalling cabinet separation distance within 1 meter, clean internal cabinet environment, no severe cable friction or oil splash, projects requiring fast plug-and-play installation without field cable stripping wiring.