Description
The EPRO PR6423/002-001-CN (now part of the Emerson / Emerson Process Management portfolio) is a non-contact eddy current displacement sensor designed for high-precision measurement of shaft vibration, position, and expansion in critical rotating machinery. The “-CN” suffix typically indicates a version specifically certified or labeled for the Chinese market, often involving CCC or localized safety documentation.
Product Parameters (Datasheet)
- Model Number: PR6423/002-001-CN
- Sensor Type: Eddy Current (Non-contact)
- Tip Diameter: 8.0 mm
- Measuring Range: 2.0 mm (standard for 8mm tips)
- Linear Range: 0.5 mm to 2.5 mm from the sensor face
- Thread Size: M10 x 1
- Cable Length: 1.0 meter (integrated cable to connector)
- Connector Type: Lemo or specialized screw-on coaxial connector
- Operating Temperature: -35°C to +150°C
- Case Material: Stainless steel with high-resistance plastic tip
EPRO PR6423002-001-CN
EPRO PR6423002-001-CN
EPRO PR6423002-001-CN
Country of Origin
This precision monitoring hardware is engineered and manufactured in Germany (by EPRO GmbH, an Emerson company), adhering to the highest European standards for machine protection systems (MPS).
Application Fields
The PR6423 series is a global standard for Machine Health Monitoring on large turbomachinery:
- Power Plants: Monitoring shaft vibration and axial thrust position in steam and gas turbines.
- Oil & Gas: Tracking the movement of centrifugal compressors and high-speed pumps.
- Chemical Industry: Detecting bearing wear in large mixers and cooling tower fans.
- Steel Mills: Measuring thermal expansion and shaft eccentricity in rolling mill drives.
- Hydroelectric: Monitoring the guide bearing clearance and vibration of hydro-turbines.
Product Usage Instructions
- Mechanical Installation: Mount the sensor into a threaded bracket or through-hole. The sensor tip must be parallel to the shaft surface for accurate readings.
- Gap Calibration: Use a voltmeter connected to the associated driver (transmitter) output. Adjust the physical distance (gap) between the sensor tip and the shaft until the DC voltage matches the manufacturer’s “center-point” specification (typically -10V DC for a -2V to -18V range).
- Cable Handling: Do not kink the integrated coaxial cable. Use the proper armored conduit if the cable is exposed to oily or abrasive environments.
- Driver Matching: This sensor MUST be used with a compatible EPRO/Emerson driver (e.g., CON011 or CON021 series) calibrated for an 8mm sensor and the specific cable length (e.g., 5m or 10m total system length).
- Target Material: Ensure the shaft material is standard 42CrMo4 or 4140 steel. If the shaft is made of specialized stainless steel or non-ferrous metal, the system must be recalibrated for that specific material’s electrical properties.
Product Technical Description
The PR6423/002-001-CN operates on the eddy current principle. The driver sends a high-frequency signal to the coil in the sensor tip, creating an electromagnetic field. As the metal shaft moves closer to or further from the tip, it absorbs energy from this field through the creation of eddy currents. This change is converted by the driver into a proportional voltage signal. Technically, it is a “static and dynamic” sensor, meaning it can measure the average distance (position/thrust) as well as the high-speed oscillation (vibration). Its rugged construction is designed to withstand the high temperatures and pressures found inside bearing housings.
Q&A (Common Questions)
- Q: Can I shorten the cable if it is too long?
- A: No. The cable length is part of a tuned circuit. Cutting or splicing the cable will change its capacitance/inductance and cause significant measurement errors.
- Q: What is the difference between the PR6423 and the PR6424?
- A: The PR6423 has an 8mm tip for standard ranges, while the PR6424 typically has a 12mm or larger tip for extended measuring ranges.
- Q: My sensor has a “CN” suffix; can I use it with a non-CN driver?
- A: Yes, physically and electrically they are identical. The “CN” usually relates to localized certifications (like CCC) for the Chinese market.
- Q: Why is my output voltage stuck at -0.5V?
- A: This usually indicates the sensor is “bottomed out” against the shaft or there is a short in the cable.
Similar Model Recommendations
- EPRO PR6422: Smaller 5mm tip for tight spaces.
- EPRO PR6425: Larger tip for measuring very large expansions.
- Emerson CON021: Compatible signal converter (driver) for the PR6423.
- Bently Nevada 3300 XL 8mm: The primary industry alternative (requires different mounting).
- EPRO PR9268: Absolute vibration sensor (seismic) for bearing housing measurement.
For technical manuals or a formal quote on the EPRO PR6423/002-001-CN, please contact our machine protection specialists.
