Emerson Epro CON021/916-120+PR6426/010-110 Eddy Current Sensor

System Overview

This specific measurement chain combines the CON021 converter with the PR6426 series sensor. The PR6426 is a specialized eddy current probe designed for high-temperature and high-pressure applications, such as those found deep within steam turbines or near combustion chambers in gas turbines. This set is specifically calibrated for a 12-meter total system length.

Component 1: CON021/916-120 Signal Converter

The CON021/916-120 is the driver/transmitter calibrated for an extended cable run.

• Model: CON021/916-120
• System Calibration: Exactly 12.0 meters (Total of probe cable + extension cable).
• Function: Oscillator/Demodulator that generates the electromagnetic field for the probe tip.
  
• Output Range: Standardized analog voltage (typically 0 to -20 VDC).
• Housing: Compact, shielded aluminum for DIN-rail mounting.

Component 2: PR6426/010-110 Displacement Sensor

The PR6426 is the "Heavy Duty" variant of the Epro displacement sensors, often featuring enhanced sealing and temperature resistance.

• Model: PR6426/010-110
• Tip Diameter: Typically 8 mm.
• Measuring Range: Approximately 2.0 mm (Nominal).
• Integral Cable (010): 1.0 meter integral cable length.
• Protection (110): The "110" suffix typically indicates a stainless steel flexible armored conduit with specific high-temperature FEP or PFA cable insulation.
• Operating Temperature: Designed to withstand significantly higher temperatures (up to 180°C or higher at the tip) compared to the standard PR6423.

Key Performance Characteristics

• Extended Linear Window: Provides high-resolution measurement even in the presence of extreme thermal expansion of the machine shaft.
• System Integrity: The 12-meter calibration (916-120) allows the converter to be located in a remote junction box, protecting the electronics from the high heat of the turbine deck.
• Sensitivity: Typically 8 V/mm (200 mV/mil) when matched with the 12m driver.
• Pressure Resistance: The PR6426 tip is often rated for high-pressure environments (up to 50 bar or more), making it suitable for submerged mounting in pressurized oil films.