Emerson PR6423/004-030 CON021 Eddy Current Sensor

Emerson PR6423/004-030 (commonly paired with the CON021 signal converter) is a high-performance eddy current displacement sensor engineered for non-contact measurement of critical rotating machinery . As part of the renowned EPRO series by Emerson, this sensor is designed to meet the stringent requirements of API 670 standards, making it the preferred choice for monitoring shaft vibration, axial displacement, eccentricity, and speed in steam turbines, gas turbines, compressors, and other critical assets .

What is the Emerson PR6423/004-030?

The Emerson PR6423/004-030 is an eddy current displacement sensor that provides precise, non-contact measurements of conductive target materials . Operating on the principle of high-frequency eddy currents, this sensor generates a low-impedance voltage signal proportional to the distance between the probe tip and the shaft surface. This signal is typically conditioned by a CON021 signal converter, which demodulates the RF signal into a usable output for monitoring systems such as the MMS6000 .

The "004" in the model number typically denotes specific mechanical and electrical configurations, including probe tip diameter, thread size, cable length, and connector type, ensuring precise compatibility with your existing machinery protection system . The sensor features an 8mm probe diameter with a linear measurement range of approximately 2 mm, making it ideal for tight-clearance installations in bearing housings and turbine casings .

Key Technical Specifications (Specs)

The PR6423/004-030 is engineered for uncompromising accuracy and durability in industrial environments.

Manufacturer: Emerson (EPRO Series)

Model Number: PR6423/004-030 (often supplied with CON021/913-030) 

Sensor Type: Eddy Current Displacement Sensor 

Probe Diameter: 8 mm 

Linear Measurement Range: 2 mm (80 mils) 

Initial Air Gap: 0.5 mm (20 mils) 

Incremental Scale Factor (ISF): 8 V/mm (203.2 mV/mil) ±5% @ 0 to 45°C 

Deviation from Straight Line (DSL): ±0.025 mm (±1 mil) @ 0 to 45°C 

Temperature Range: -40°C to +150°C (sensor head) 

Frequency Response: 20 Hz to 10 kHz 

Output Signal: Via CON021 converter: 4-20 mA or voltage output 

Housing Material: Stainless Steel 

Protection Rating: IP67 (when properly installed) 

Connector Type: M12 x 1.5 thread (typical) 

Compliance: API 670, DIN 45670, ISO 10817-1 

Hazardous Area Approval: Suitable for operation with safety barriers in explosive environments