Description
The EPRO PR6423/000-000 is a non-contact eddy current displacement sensor designed for high-precision measurement of shaft vibration, axial thrust position, and rotating speed. Manufactured under the EPRO brand (now part of the Emerson/Emerson Process Management family), this sensor is a critical component for machinery protection systems in turbines, compressors, and pumps.
EPRO PR6423000-000
Product Technical Description
The PR6423 series operates on the eddy current principle. The sensor head contains a coil energized by a high-frequency electromagnetic field. When a conductive metallic target (such as a machine shaft) approaches the sensor tip, eddy currents are induced in the target, absorbing energy from the field. This energy loss is proportional to the distance between the sensor and the target.
- Design: The “000-000” suffix typically denotes a standard configuration with a specific cable length and no special armor or connector modifications.
- Target Material: Standard calibration is optimized for ferromagnetic steel (e.g., 4140 steel).
- Signal Conversion: This sensor must be connected to a signal converter (CON series) or a monitoring rack (such as the MMS 6000) to translate the gap into a standard voltage signal (typically -2V to -18V DC).
Product Datasheet (Parameters)
| Parameter | Specification |
| Model Number | PR6423/000-000 |
| Sensor Tip Diameter | 8 mm |
| Measuring Range | 2.0 mm (standard) / up to 4.0 mm depending on converter |
| Linearity Range | 0.5 mm to 2.5 mm |
| Thread Size | M10 x 1 (Standard Metric) |
| Body Material | Stainless Steel with Ceramic or Ryton Tip |
| Cable Type | Integrated Coaxial Cable |
| Cable Length | 1.0 meter (standard integral cable) |
| Operating Temperature | -35°C to +150°C (up to +180°C at tip) |
| Protection Class | IP67 (Sensor head and cable) |
| Country of Origin | Germany |
Technical Characteristics
- High Sensitivity: Capable of detecting sub-micron movements in high-speed rotating equipment.
- Resistance: Excellent resistance to oil, water, and steam, making it suitable for internal bearing housing environments.
- Static & Dynamic Measurement: Can measure both static gaps (axial position) and dynamic movements (radial vibration).
Common Questions & Answers (Q&A)
Q: Does the PR6423/000-000 require a specific driver?
A: Yes, it requires an EPRO/Emerson converter (e.g., CON 011/021/041) to provide the excitation frequency and output a linear signal.
Q: Can I shorten the integral cable if it is too long?
A: No. The cable length is part of the tuned circuit. Cutting or altering the cable will change the electrical impedance and invalidate the calibration.
Q: What is the difference between PR6423 and PR6424?
A: The PR6423 typically uses an 8mm tip, while the PR6424 is usually a larger diameter (e.g., 12mm or 16mm) for applications requiring a wider measuring range.
Q: How should the sensor be mounted?
A: It should be mounted using a bracket or through-hole tapping. Proper “gapping” is required during installation (usually setting the DC bias voltage to the midpoint of the linear range, around -10V).
Similar Model Recommendations (8 Units)
- PR6422/010-000: Smaller tip diameter (5mm) for tight installation spaces.
- PR6423/010-000: PR6423 variant with a longer unthreaded section or different cable length.
- PR6424/000-000: Larger tip (12mm) for extended measurement range (up to 4mm or 8mm).
- PR6425/010-000: High-temperature variant for extreme environments.
- CON 011: The standard signal converter used to power this sensor.
- CON 021: Converter with integrated safety barriers for hazardous areas.
- PR9268/017-000: Absolute vibration sensor (seismic type) often used alongside proximity probes.
- Bently Nevada 330101-00-08-00: The closest industry equivalent (3300 XL 8mm) with metric threads.
