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NON-CONTACT SHAFT MEASUREMENT
Continuous displacement measurement without mechanical contact
The PR6423 uses the eddy current measurement principle to sense the distance between the probe tip and an electrically conductive ferromagnetic shaft target. Because the measurement is non-contact, the sensor can monitor shaft motion without physical rubbing between the sensing element and the rotating surface.
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| Manufacturer | Emerson EPRO | Model | PR6423-03R-012-ZD |
| Sensor Type | 8 mm Eddy Current Sensor | Measurement Principle | Non-contact eddy current |
| Tip Diameter | 8.0 mm | Static Position Range | ±1.0 mm |
| Dynamic Measurement Range | 0–500 μm peak-to-peak | Linear Measuring Range | 2 mm / 80 mils |
| Initial Air Gap | 0.5 mm / 20 mils | Incremental Scale Factor | 8 V/mm / 203.2 mV/mil ±5% |
| Best-Fit Linearity Deviation | ±0.025 mm / ±1 mil | Minimum Shaft Diameter | 25 mm |
| Standard Target Material | 42CrMo4 / AISI 4140 ferromagnetic steel | Protection | IP66 |
| Sensor Temperature | −35°C to +180°C | Cable / Connector Temperature | −35°C to +150°C |
| Sensor Tip Material | PEEK | Sensor Housing | Stainless steel |
| Cable Material | PTFE | Connector | Nickel-plated brass |
| Sensor Weight | Approx. 100 g with 1 m cable | Application Class | Critical rotating machinery |
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01
Eddy Current Field
The probe establishes an electromagnetic field at the sensing tip. Changes in target distance alter the electrical response.
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02
Shaft Displacement
Radial or axial movement changes the probe-to-target distance without requiring physical contact with the shaft.
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03
Monitoring Signal
The sensor forms part of a complete eddy-current measuring system with the associated converter and monitoring equipment.
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MACHINERY MONITORING
Where shaft displacement matters
The PR6423 family is intended for critical rotating machinery where shaft position and dynamic movement need to be continuously monitored. Typical applications include steam turbines, gas turbines, hydro turbines, compressors, gearboxes, pumps and fans.
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Measurement applications
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PR6422
5 mm tip sensor for smaller shafts, with a ±0.5 mm position range and 16 V/mm sensitivity.
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PR6423
8 mm sensor family for medium shaft applications, with ±1.0 mm position measurement and 8 V/mm sensitivity.
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PR6424
A larger sensor family used where the mechanical installation and measuring range require the corresponding PR6424 configuration.
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PR6426
Another PR642x family option for machinery measurement configurations requiring the corresponding sensor geometry and range.
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01 / GAP
Maintain the specified initial gap
The nominal initial air gap for the PR6423 specification is 0.5 mm. Correct probe positioning is important for obtaining the specified linear measurement behavior.
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02 / TARGET
Use a suitable shaft target
The standard measuring target is ferromagnetic steel such as 42CrMo4 / AISI 4140. Shaft geometry and minimum diameter should be considered during mechanical design.
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03 / CLEARANCE
Keep the sensing area free of unwanted metal
Metallic objects near the active sensing area can influence eddy-current measurement. Installation should preserve the required probe geometry and surrounding clearance.
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REQUEST PR6423-03R-012-ZD
Check the exact probe configuration before ordering
For a quotation, please provide the part number, quantity, destination, required date and machine/system details. We can also help compare related PR6423 configurations when the existing installation requires a matching replacement.
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✉ EMAIL SALES ◉ WHATSAPP |
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01 · Is PR6423-03R-012-ZD suitable when the existing machine has a shaft diameter close to the lower limit?
The PR6423 specification calls for a minimum shaft diameter of 25 mm. When the shaft is close to this limit, the mechanical geometry around the probe should be checked carefully because target size and surrounding metal can influence the measurement behavior.
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02 · What should be verified before replacing an installed PR6423 with PR6423-03R-012-ZD?
Verify the complete sensor configuration, probe dimensions, cable arrangement, connector interface, measuring target, required gap and the associated signal converter. A PR6423 replacement should match the installed measurement chain rather than being selected only by the family number.
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03 · Why does the 0.5 mm initial gap matter when installing PR6423-03R-012-ZD?
The specified initial air gap establishes the intended operating point for the sensor. The PR6423 specification uses a 0.5 mm initial gap, and positioning outside the intended measurement geometry can reduce the available linear range or introduce additional measurement deviation.
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04 · Can PR6423-03R-012-ZD be used for both shaft vibration and shaft position monitoring?
Yes. The PR6423 family is designed for both static and dynamic shaft displacement measurement. Its applications include radial and axial shaft displacement, shaft eccentricity and shaft vibration. The actual system function depends on the selected converter and monitoring architecture.
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05 · When a PR6423-03R-012-ZD probe is exposed to high temperature, which part of the assembly needs attention?
The PR6423 specification separates the temperature limits of the sensor and its cable/connector. The sensor with its 1 m cable is specified from −35°C to +180°C, while the cable and connector are specified from −35°C to +150°C. Installation should therefore consider the actual temperature at both the probe and cable/connector locations.
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PR6423
8 mm Sensor
Non-contact shaft measurement
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Embrace the Future of Innovation Unlock the Power of Seamless Automation By integrating advanced automation solutions, real-time analytics, sophisticated control systems, and lifecycle services, improves operational performance while reducing risks, costs, and downtime. WeChat: hu18030235311 | WhatsApp: +86-18030235311 Mobile: +86-18030235311 | E-mail: sales3@amikon.cn
Embrace the Future of Innovation Unlock the Power of Seamless Automation By integrating advanced automation solutions, real-time analytics, sophisticated control systems, and lifecycle services, improves operational performance while reducing risks, costs, and downtime. WeChat: hu18030235311 | WhatsApp: +86-18030235311 Mobile: +86-18030235311 | E-mail: sales3@amikon.cn
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Embrace the Future of Innovation Unlock the Power of Seamless Automation By integrating advanced automation solutions, real-time analytics, sophisticated control systems, and lifecycle services, improves operational performance while reducing risks, costs, and downtime. WeChat: hu18030235311 | WhatsApp: +86-18030235311 Mobile: +86-18030235311 | E-mail: sales3@amikon.cn
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