Emerson PR6423000-111

Core Technical Specifications

• Sensing Principle: High-frequency eddy current inductive non-contact measurement
• Nominal Target Measurement Range: 0–2.0mm linear working gap range
• Output Sensitivity: 7.874 V/mm standard linear output slope
• Probe Tip Diameter: 8mm standard metal sensing tip
• Integral Cable Length: 1m factory molded integral cable; compatible with standard 3300 XL extension cables
• Operating Frequency Bandwidth: 10Hz – 10kHz, suitable for low-speed and high-speed turbine rotor vibration capture
• Operating Temperature Range: -35°C ~ +175°C continuous probe tip temperature; cable rating -35°C ~ +125°C
• Insulation & Voltage Rating: Dielectric withstand 500VAC between cable conductors and outer shield
• Mechanical Thread Mount: M10×1 standard metric mounting thread for machine bearing housing installation
• Shield Structure: Double-layer copper braided cable shielding for superior EMC noise suppression
• Linear Measurement Accuracy: ±1.25% full scale linearity error within working gap range
• Environmental Resistance: Resistant to oil mist, light hydrocarbon fluids, steam and industrial lubricants inside bearing housings
• Certifications: CE industrial EMC, ATEX intrinsic safety certification for hazardous gas zone installations
• Physical Dimensions: Probe body length 42mm, M10 threaded section 18mm; total integral cable length 1000mm

Function & Performance Features

1. Non-contact measurement design eliminates mechanical wear between probe and rotating metal shaft target, zero friction measurement for long-term continuous monitoring
2. Wide linear gap window provides stable vibration reading during thermal shaft expansion and minor rotor misalignment
3. Double-shielded molded integral cable reduces electromagnetic interference from variable frequency drives, high-voltage motor wiring and power transformers
4. High temperature rated probe tip withstands continuous high heat inside gas turbine, steam turbine and centrifugal compressor bearing enclosures
5. ATEX intrinsic safety classification allows direct installation inside Class I hazardous process zones without additional flameproof enclosures
6. Consistent factory calibrated sensitivity ensures interchangeability of identical PR6423 probes without re-calibration of monitoring system channels
7. Detects micro-level shaft radial vibration (micrometer scale) and slow axial thrust displacement for predictive maintenance and machinery trip protection
8. Compatible with full range of Emerson 3300 XL monitors, 3500 rack monitoring systems and portable vibration data collectors

Working Principle

Material & Structural Composition

• Probe sensing tip: High-temperature resistant non-magnetic stainless steel alloy
• Probe main housing: Titanium alloy body for low thermal expansion and corrosion resistance
• Internal coil assembly: Enameled copper winding sealed with high-temperature ceramic epoxy potting compound
• Integral cable outer jacket: Fluorosilicone heat-resistant rubber, resistant to mineral oil, steam and chemical vapors
• Cable shielding: Inner copper foil shielding layer + outer braided copper mesh double shielding construction
• Threaded mounting section: Precision machined M10 stainless steel thread with anti-seize coating compatibility
• Connector termination: Hermetically sealed 4-pin microdot connector to prevent oil, water and dust ingress at cable extension joints

Installation Requirements

1. Install via M10 threaded hole machined into bearing housing; use matching lock nut to fix probe position without over-tightening (torque limit 3–4 N·m)
2. Set static rest gap between probe tip and rotor shaft to mid-point of linear range (1.0mm nominal gap) during cold machinery shutdown
3. Route probe integral cable and extension cable separate from three-phase motor power cables, minimum separation distance 50mm
4. All cable shielding must single-end ground at the signal conditioner rack terminal; avoid double grounding to eliminate ground loop interference
5. Maintain minimum 5mm clearance between probe tip and any non-target metal hardware to prevent measurement signal distortion
6. Avoid sharp cable bending (minimum bend radius 25mm) to prevent internal conductor breakage inside high-temperature bearing housings
7. After mounting gap adjustment, perform static gap voltage calibration via Emerson monitoring system before machinery startup

Typical Application Scenarios

• Steam turbine, gas turbine and hydroelectric generator rotor vibration & thrust position monitoring
• Centrifugal air compressor, ammonia refrigeration compressor critical bearing condition monitoring
• Petrochemical refinery high-speed process pump and turbo-expander protection systems
• Power plant boiler feed pump, circulating water pump predictive vibration monitoring
• Onshore and offshore gas pipeline turbo-compressor safety monitoring racks

Mandatory Operation & Maintenance Precautions

1. Do not scratch, dent or deform the stainless steel probe sensing tip surface; surface damage will degrade linear measurement performance
2. Never over-tighten M10 mounting lock nuts; excessive torque cracks internal epoxy potting and destroys coil assembly
3. Inspect cable jacket for oil swelling, cracking or heat degradation every annual machinery overhaul cycle
4. If vibration signal drift occurs, first recheck static probe gap and cable shielding grounding before replacing probe hardware
5. Store spare probes in dry anti-static packaging; avoid long-term exposure to high temperature or corrosive chemical environments
6. Do not cut or splice factory molded integral probe cables; splices break double-shield integrity and invalidate factory calibration
7. In hazardous classified areas, only use certified intrinsically safe barrier modules between probe and monitoring rack per ATEX installation rules