Emerson Epro CON021/916-200+PR6426/010-140 Eddy Current Signal Converter

System Overview

This measurement chain is a high-precision, non-contacting displacement system designed for critical machinery protection. It combines the CON021/916-200 driver with the PR6426/010-140 high-temperature probe. This specific set is calibrated for a 20-meter total system length, making it ideal for large-scale power plant turbines where the sensor is located deep within the machine and the electronics must be housed in a remote, protected cabinet.

Component 1: CON021/916-200 Signal Converter

The CON021/916-200 acts as the oscillator and demodulator. The "916-200" suffix is the most critical specification, as it dictates the internal tuning for cable impedance over a long distance.

• Model: CON021/916-200
• System Calibration: Exactly 20.0 meters (Total of probe cable + extension cable).
• Output Signal: Standardized analog voltage, typically 0 to -20 VDC.
• Linearity: Optimized to provide a constant sensitivity (slope) across the 20m run.
• Mounting: 35mm DIN-rail compatible with a shielded aluminum housing to prevent EMI interference.

Component 2: PR6426/010-140 Displacement Sensor

The PR6426 is the "Heavy Duty" variant of the Epro eddy current probes, specifically engineered for high-temperature and high-pressure environments.

• Model: PR6426/010-140
  
• Tip Diameter: 8 mm.
• Measuring Range: 2.0 mm (Nominal).
• Integral Cable (010): 1.0-meter integral cable length.
• Protection (140): The "140" suffix typically specifies a stainless steel flexible armored conduit with a specific high-temperature FEP/PFA cable and a specialized terminal connector (often a LEMO or similar high-vibration plug).
• Temperature Rating: Tip rated for up to 180°C (356°F), suitable for mounting near high-pressure steam seals or within bearing housings.
  

Key Performance Characteristics

• Sensitivity: Typically 8 V/mm (200 mV/mil) when matched with the 20m driver and a standard steel target (42CrMo4).
• Remote Reach: The 20-meter capability allows for the converter to be placed far from the "hot zone," increasing the lifespan of the electronics.
• Machine Protection: Provides high-speed data for axial thrust, radial vibration, and eccentricity monitoring in the MMS 6000 or Ovation systems.
• Diagnostic Output: The "Sensor OK" window is usually between -2V and -18V. If the voltage drops to 0V (short) or rises toward the supply voltage (open), the system triggers a channel fault.