Component Snapshot At-a-Glance
- Model: PR6424/010-130 + CON011
- Alt. P/N: No single combined part number; sold as matched probe + proximitor set
- Product Series: EPRO PR6424 eddy current sensor + CON011 signal converter (MMS6000 / AMS6500 compatible)
- Hardware Type: Complete non-contact eddy current measurement chain (probe, armored extension cable, outdoor proximitor)
- Key Feature: 16mm sensing head, 10m armored cable, IP67 rated CON011 LEMO connector interface
- Primary Field Use: Measures radial shaft vibration, thrust position, rotor eccentricity and differential expansion on steam/gas turbines and compressors.
Hard-Numbers: Technical Specifications
- Protocol Support: Analog gap voltage output (-4 ~ -20VDC) direct to A6110/A6210/A6220 monitor cards
- Port Count: LEMO 7-pin probe input; 4-screw terminal power/signal output
- Frequency Bandwidth: DC ~ 10kHz, captures slow roll eccentricity and high-speed vibration
- Operating Temperature: Probe head -20°C ~ +150°C; CON011 -20°C ~ +85°C
- Isolation Rating: CON011 internal circuit isolation 1000V DC
- Power Draw: CON011 supply -26.7VDC, 20mA nominal
- Probe Spec: 16mm head, 3/4″-16 UNF thread, 10m stainless steel armored cable
- Linear Measuring Range: 0 ~ 2mm gap; nominal operating gap 0.8–1.2mm
- Output Sensitivity: 8mV/μm displacement
- Protection Rating: IP67; probe cable IP68
- Compliance: API 670, DIN 45670, ATEX IIC T6 hazardous area variants available
The Real-World Problem It Solves
Piezo accelerometers cannot capture static shaft offset or slow rotor bow during turbine barring. Unmatched probe-proximitor sets produce non-linear readings, triggering false machinery trips and misdiagnosis.Where you’ll typically find it:
- Power plant steam/gas turbine radial bearing vibration and thrust bearing position monitoring
- Refinery high-speed centrifugal compressor rotor eccentricity & differential expansion measurement
- Hydro generator large shaft slow-roll eccentricity detection during startup cooldown
This matched eddy current chain delivers steady DC gap voltage plus AC vibration signal for both protection and diagnostic monitoring without physical shaft contact.
Hardware Architecture & Under-the-Hood Logic
proximitor contains oscillator, demodulator and signal conditioning; PR6424 probe acts as passive sensing coil, no on-board electronics.
- oscillator sends high-frequency excitation down armored cable to PR6424 probe coil.
- Metal rotor target induces eddy currents, altering probe coil impedance proportional to gap distance.
- Return signal demodulated to split DC gap offset + AC vibration waveform.
- Short-circuit and reverse polarity protection built into input stage.
- Combined -4 ~ -20VDC analog signal sent via field wiring to AMS6500 monitor modules.
- LEMO quick-disconnect plug locks probe cable to for vibration-resistant connection.
Field Service Pitfalls: What Rookies Get Wrong
Mismatched cable length without calibration trimTechnicians swap 10m PR6424/010-130 onto calibrated for shorter cables. Capacitance shift distorts linear curve and creates large measurement drift.
- Field Rule: Always pair exact cable length probe with matching ; run full gap calibration after cable replacement.
Dual-end shield grounding creates severe ground loop noiseTechs bond armored cable shield to both machine housing and cabinet ground. 50/60Hz hum superimposes on vibration signal, spawning constant false alert alarms.
- Quick Fix: Terminate shield ONLY at the cabinet end; leave machine-side armor floating electrically.
Probe gap set outside linear operating windowNew installers set gap <0.5mm or >1.5mm for ease of mounting. Output leaves calibrated linear range, readings no longer proportional to actual shaft motion.
- Field Rule: Target static gap of 1.0mm; verify gap voltage near -12VDC with micrometer gap gauge before unit startup.
Commercial Availability & Pricing Note
Please note: The listed price is for reference only and is not binding. Final pricing and terms are subject to negotiation based on current market conditions and availability.
