Product Core Brief

• Model: PR6423/003-110 (Probe Assembly) + CON021 (Single Channel Rack Preamplifier)
• Brand: EPRO (Emerson Machinery Health Monitoring, Germany)
• Series: M10 eddy current probe series, factory matched for MMS3000 / A6000 turbo machinery protection racks
• Model Code Decode = M10×1 thread, 8mm sensing head, ±1mm linear span for radial vibration/003 = 3 meters factory integrated high-temperature cable-110 = Full stainless steel metal armored braided cable, factory molded Lemo self-locking plug (direct plug CON021 front port)
• 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: Complete armored cable sensing kit (M10 probe head + 3m stainless steel armored high-temp cable + molded Lemo plug + rack-mount signal converter)
• Key Specs: M10×1 stainless housing, 8mm sensing tip; ±1mm linear measuring span; factory calibrated 8V/mm sensitivity matched for ; 3m metal armor anti-abrasion cable, integrated Lemo plug plug-and-play designNote: Discontinued legacy machinery monitoring hardware, stocked as unopened factory calibrated new surplus; probe and must be used as a matched set to guarantee linear measurement accuracy.

 

Key Technical Specifications

 

/003-110 Probe Assembly

1. Mechanical Structure

• Thread standard: M10 × 1 stainless steel housing
• Sensing head diameter: 8mm standard target sensing tip
• Integrated cable length: 3m continuous high-temperature coaxial core with full stainless steel outer armor braid
• Cable suffix -110: Metal armored cable + one-piece molded Lemo self-locking circular plug, direct plug into front port without field wiring
• Minimum cable bend radius: ≥50mm, sharp tight bends will deform metal armor and damage internal coaxial core, causing signal drift
• IP rating: Probe head IP67; armored cable IP68 anti-oil, anti-scratch, anti-mechanical impact

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 vibration frequency 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 operation

3. Thermal & Environmental Limits

• Probe head continuous working temperature: -35°C ~ +180°C; transient peak +200°C
• Internal coaxial cable insulation rating: Max 200°C PTFE insulation
• Storage & transport temperature: -40°C ~ +70°C
• Vibration resistance: 5g continuous vibration at 60Hz bearing housing mounting; metal armor resists cable abrasion from equipment vibration friction
• Working ambient pressure: Uniform 2bar external 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

• /003-110 probe assembly net weight: ~0.24kg (metal armor adds weight vs ordinary braided cable models)
• module dimensions: 128mm H × 25mm W × 160mm D; weight ~0.38kg

 

Product Introduction

This 3-meter metal armored Lemo plug M10 eddy current matched kit is specially designed for harsh mechanical friction, oil splashing, easy cable scratch machinery houses of power plants and petrochemical plants, fully complying with API 670 turbo machinery vibration protection 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 core difference of suffix -110 compared to -010/-030 is the full stainless steel outer armor cable: it can resist sharp metal edges scratch, equipment vibration friction, lubricating oil corrosion, suitable for bearing housing area with messy pipeline layout and easy cable damage. The integrated molded Lemo plug realizes plug-and-play docking with preamplifier, eliminating on-site cable terminal wiring work and reducing maintenance error risks.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 directly 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, greatly 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 harsh cable routing environments.

 

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, metal armor deformation, 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 internal cable shield and rack ground; perform cable bending vibration cycle test to confirm molded Lemo connector maintains stable signal without intermittent dropout under armor deformation.
4. Calibration Record Backup: Archive original factory calibration certificate recording nominal midpoint air gap, calibrated sensitivity and linearity tolerance; document rear terminal wiring polarity for field maintenance reference.
5. Final QC Packaging: Attach serialized printed test pass tag with full linearity test data; coil the 3m armored cable with foam separators to avoid armor extrusion deformation; 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.❗ Armor Cable Bending Risk: Strictly maintain ≥50mm minimum bend radius; excessive small-radius bending will permanently deform stainless steel armor, squeeze internal coaxial wire and cause permanent signal drift.❗ EMI Interference Risk: Route all armored probe 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; carefully coil 3m armored 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 /003-110 probe into bearing mount; adjust lock nut to set 1.0mm nominal air gap measured via precision feeler gauge; route 3m armored cable away from high-current power wiring, avoid sharp metal pipeline edges scratching armor; 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 /003-110 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 core difference between -110, -010 and -030 suffixes of ?A:

• -110: Stainless steel metal armored cable + molded Lemo plug, anti-abrasion, harsh mechanical environment dedicated
• -010: Ordinary PTFE braided cable + molded Lemo plug, standard clean cabinet wiring
• -030: Ordinary braided cable + bare stripped open wire ends, field terminal wiring requiredQ: 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 /003-110 + full kits?A: All stocked calibrated kits carry a 12-month functional warranty covering factory calibration linearity, metal armor 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, metal armor cable structure 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 channel.Q: What scenarios are suitable for choosing -110 armored cable model?A: Bearing housings with dense metal pipelines, frequent equipment maintenance cable friction, lubricating oil splash environment, field open-air machinery houses, occasions where ordinary braided cables are easy to scratch and damage.