EMERSON PR6423/008-110+CON041 Eddy Current Sensor
Product Overview
The EMERSON PR6423/008-110 (8mm probe) paired with the CON041 signal converter forms a complete high-precision eddy current measurement system for turbine safety monitoring (TSI) and rotating machinery condition monitoring. Complying with API 670, ISO 10817-1 and DIN 45670 standards, this non-contact sensor delivers stable shaft vibration, shaft position and axial displacement measurement for steam turbines, gas turbines, compressors, gearboxes and heavy-duty industrial pumps.Thanks to eddy current technology, the sensor is completely unaffected by oil film, dust and moisture, ensuring long-term reliable operation in harsh mechanical compartments.
Model Definition
PR6423/008-110
- PR6423: 8mm standard eddy current probe
- 008: Mounting thread M10×1
- Thrust bearing axial displacement
- Shaft eccentricity and differential expansion
- Key phase / speed reference signal (optional application)
Core Specifications (PR6423/008-110 Probe)
- Probe Diameter: 8 mm
- Linear Range: ±1.0 mm (total 2 mm)
- Sensitivity: 8 V/mm (±5% tolerance @ 0–45°C)
- Frequency Response: 0 Hz – 20 kHz
- Minimum Shaft Diameter: ≥25 mm
- Material: PEEK tip, stainless steel housing, PTFE cable
- Ingress Protection: IP66
Operating Temperature: -35℃ ~ +180℃ (probe)
CON041 Signal Converter (Pre-amplifier)
The CON041 is a dedicated matched preamplifier for the PR642 series, providing sensor excitation and converting eddy current signals into standard linear voltage output for TSI systems.
- Frequency Response: 0–20 kHz
- Power Supply: -23 V ~ -32 V DC
- Output Signal: -4 V ~ -20 V
- Protection Class: IP20
- Operating Temperature: -30℃ ~ +100℃
Key Features
- Non-contact Measurement: No mechanical wear, suitable for 24/7 continuous monitoring
- Oil-film Immunity: Readings not affected by lubrication oil, steam or dust
- High Precision: Linear error ≤1% with factory matched calibration
- Harsh Environment Resistance: High temperature and vibration resistance
- Explosion-proof Option: Ex ib IIC T6 certified for petrochemical and power plant hazardous areas
Typical Applications
Widely used in power generation, petrochemical and heavy industry fields, including steam turbines, gas turbines, water turbines, centrifugal compressors, industrial gearboxes, large fans and boiler feed pumps. It serves as a core sensing component for TSI safety protection systems.
Assembly Note
The PR6423 probe and CON041 converter are factory-calibrated matched sets. Do not replace the probe or preamplifier individually without recalibration, otherwise measurement accuracy and linearity will be invalid.
Frequently Asked Questions
Q1: Can I mix and match PR6423 probes with different CON041 preamplifiers?
A: No. Each PR6423 + CON041 set is factory pre-calibrated as a whole. Random matching will cause sensitivity deviation and linearity failure, failing API 670 accuracy standards. Individual replacement requires professional recalibration.
Q2: Will lubricating oil film or moisture affect measurement results?
A: No. Eddy current sensors only respond to metal conductors. Oil film, water vapor, dust and air do not interfere with detection, which makes it the best solution for bearing chamber long-term monitoring.
Q3: What is the standard installation gap for the PR6423 probe?
A: The recommended initial installation gap is 1.0–1.5 mm under cold static machine status. Adjust the gap to the middle of the linear range via CON041 output voltage to avoid signal saturation and ensure complete vibration signal acquisition.
Q4: Why does the sensor output fixed and unchanged data?
A: Common causes include excessive probe gap, damaged probe tip, cable breakage or loose connector. These issues will lead to signal saturation or signal loss. Check installation distance and circuit integrity first for on-site troubleshooting.
Q5: Is recalibration required for different shaft materials?
A: Yes. The factory default calibration is based on 42CrMo4 standard steel. Special materials such as stainless steel or alloy steel will change eddy current induction efficiency, requiring material-specific recalibration to guarantee accuracy.
Q6: What are the temperature limits for probe and preamplifier?
A: The probe supports -35℃ ~ +180℃ high-temperature operation. The CON041 preamplifier only supports up to 100℃ and must be installed in a cool control cabinet, not in high-temperature turbine compartments.
Q7: Are there any restrictions on the measured shaft diameter?
A: The official minimum applicable shaft diameter is 25mm. Too small a shaft diameter will cause edge effects on the magnetic field, resulting in data drift and measurement errors.
Q8: What is the maintenance and calibration cycle for this sensor set?
A: The recommended calibration cycle is 12 months. Daily maintenance avoids hot plugging of connectors and electromagnetic interference from power cables. Regular cleaning of probe surface and thread inspection ensure long-term stable operation.
