Description
The Emerson Epro PR6423/003-030 paired with the CON021 driver constitutes an industrial-grade eddy current measuring system designed for non-contact radial shaft vibration, axial displacement, eccentricity, and keyphasor/speed tracking. This matched-pair hardware loop is deployed on high-criticality turbo-machinery such as steam, gas, and hydro turbines, high-pressure compressors, and large industrial pumps. It complies with international machine protection criteria, including API 670 and DIN 45670.
Commercial Availability & Logistics
| Operational Metric | Status & Details |
| Product Condition | New Original (Factory Sealed / New Surplus) |
| System Package Components | PR6423/003-030 Proximity Probe + CON021 Measuring Amplifier/Converter |
| Warranty | 12-month comprehensive warranty on both components |
| Shipping Availability | Standard stock assembly; packages typically ship within 24 to 48 hours |
| Pricing Note | Pricing fluctuates based on logistical demand and precious metal component costs. Contact our technical sales desk for a firm, itemized quotation. |
Part Number Breakdown & Ordering Nomenclature
To avoid hardware implementation mismatches during plant turnaround or emergency repairs, identify the exact physical and electrical traits encoded by the part number extensions:
Transducer Profile: PR6423/003-030
- PR6423: Defines the 8 mm tip diameter high-reliability eddy current sensor family.
- 003: Identifies the cable integration code. This specifies a smooth armor configuration with a standard stainless steel threaded body sleeve layout.
- 030: Designates a total uncoiled physical cable length of 3.0 meters (including the integrated sensor tail), terminated with a self-locking coaxial Lemo plug.
Converter Profile: CON021
- CON021: Specially linearized electronic driver block optimized to match the impedance signature of 8 mm probes (PR6423 series) for standard ferromagnetic target steel geometries (typically 42CrMo4 or equivalent).
Technical Specifications
[ Ferromagnetic Shaft Target ]
│
( 2.0 mm Air Gap )
│
[ PR6423/003-030 Probe ]
│ ( 3.0 m Coaxial Link via Lemo Plug )
▼
[ CON021 Converter ] ──► [ Screw Terminals: -21V to -32V DC Power ]
│
└──► [ Output Signal: -2V to -18V DC Analog Loop ] | Parameter | Specification / Value |
| Nominal Measuring Range | 2.0 mm (80 mils) dynamic displacement envelope |
| Linearity Error | \le \pm 1.0\% of the full operational scale |
| Nominal Air Gap | 1.0 mm baseline setting (centered at approx. −10 VDC output) |
| Converter Power Supply | −21 VDC to −32 VDC (negative rails standard for vibration loops) |
| Analog Output Range | −2 VDC to −18 VDC proportional to displacement |
| Sensitivity Factor (S) | 8.0 V/mm (200 mV/mil) into standard 42CrMo4 steel targets |
| Frequency Range | 0 Hz (DC position) to 20,000 Hz (high-speed dynamic vibration) |
| Probe Temperature Limits | −35 to +180 °C (−31 to +356 °F) |
| Converter Temperature Limits | −30 to +100 °C (−22 to +212 °F) |
| Enclosure Protection | Probe tip/body: IP66; Converter housing: IP20 |
| Converter Mounting | Flat surface sub-panel mounting via 4 x M5 screws |
Field Calibration & Installation Best Practices
During system integration or direct replacement within an active asset protection framework, prioritize the following engineering boundaries:
Target Material and Linearization
The CON021 converter is factory-calibrated for standard 42CrMo4 steel targets.
Critical Field Note: If the sensor faces a different shaft metallurgy (such as 300-series stainless steel, Monel, or chrome-plated journals), the electrical eddy-current dissipation changes drastically. This mismatch alters the voltage output slope (K_s), causing severe measurement errors. For non-standard shaft materials, you must re-linearize the driver using a micrometer calibration rig or obtain a specifically calibrated variation of the CON converter.
Mechanical Gap Calibration
- Mount the PR6423 sensor into the machine casing thread bracket.
- Connect the 3.0-meter coaxial cable to the CON021 converter using the integrated Lemo plug interface. Ensure the connection is clean and free of oil.
- Power the CON021 module with a nominal −24 VDC auxiliary loop.
- Thread the sensor body inward while measuring the analog DC output voltage across the converter signal terminals. Adjust the probe until the multimeter reads exactly −10.0 VDC (representing the middle of the linear operating region). Lock the counter-nuts to a maximum torque of 4.5 Nm (40 lb-in).
Frequently Asked Questions
Q: Can I extend the 3.0-meter probe cable using a standard coaxial extension line?
No. The total combined capacitance of the probe and its native cable forms a tuned LC oscillator circuit with the CON021 electronics. Altering the physical cable length by splicing or adding standard extensions will throw off the circuit tuning, rendering the factory calibration profile invalid. If a longer distance is required to reach the junction box, use a dedicated 5-meter or 10-meter factory probe assembly or insert a specific extension cable matched precisely to the system type.
Q: Why is the converter output stuck at a constant reading of approximately −0.5 VDC or −21 VDC?
An output reading near zero or −0.5 VDC indicates a low-voltage saturation state, which typically signals a shorted coaxial line or a probe tip pressed hard against the shaft face. Conversely, an output reading hitting the power supply rail (e.g., −20 VDC to −21 VDC) indicates an open-circuit fault, usually caused by a disconnected Lemo plug, a broken internal center-conductor inside the cable, or a probe gap exceeding the maximum 2.0 mm limit.
Q: Does this loop system require intrinsic safety barriers for hazardous area operation?
Yes. If the PR6423 sensor is located in an explosive zone (such as Class I Div 1 or ATEX Zone 0/1 refinery applications), you must route the power and signal conductors through an approved Zener barrier or galvanic isolator located in the safe area prior to landing on the CON021 terminals. Verify compatibility with your local hazardous area electrical code diagrams.
