Epro CON021/916-240+PR6426/010-140 Displacement System

System Architecture Overview

The Emerson Epro measurement set consisting of PR6426/010-140 proximity probe and CON021/916-240 signal converter is a matched displacement monitoring solution used for precision shaft dynamics analysis. The probe operates on eddy-current non-contact principles, while the associated CON021 conditioning unit performs signal linearization, amplification, and industrial signal conversion.

Both components are factory-calibrated as a pair, enabling direct installation without field adjustment or calibration procedures.

This system is commonly deployed for continuous monitoring of shaft position, axial movement, thermal growth, and eccentricity in rotating machinery.

Measurement Principle & Functional Behavior

The sensing system relies on eddy-current interaction between the probe tip and conductive target surface. Variations in gap distance are converted into proportional electrical signals.

The signal conditioner performs:

• Linearization of raw probe voltage response

• Temperature compensation and drift stabilization

• Filtering of high-frequency noise components

• Conversion into standard analog outputs for control systems

Output signals are suitable for PLC, DCS, and machinery protection platforms.

PR6426/010-140 Probe Specifications

Mechanical & Environmental

• Probe type: Eddy-current non-contact displacement sensor

• Thread standard: M18 × 1.5 mounting

• Cable options: 3 m, 5 m, 10 m (armored versions available)

• Operating temperature range: –35 °C to +180 °C

• Protection level: IP68 (probe head)

• Vibration resistance: up to 5 g at 60 Hz

Measurement Performance

• Nominal sensitivity: 2 V/mm (±1.5%)

• Static range: ±4 mm

• Extended dynamic range: up to ±12 mm

• Resolution: 0.1 µm

• Linearity deviation: ≤ ±1% full scale

• Frequency response: DC to 10 kHz

CON021/916-240 Signal Conditioner Specifications

Electrical Characteristics

• Input compatibility: PR6426 extended-range probes

• Supply voltage: 24 V DC ±10%

• Output formats: 4–20 mA or 0–10 V (selectable)

• Temperature drift: ≤ 0.05% per °C

• Linearity error (system): ≤ 1.5% with matched probe

Mechanical & Installation

• Mounting: 35 mm DIN rail

• Connection types: Screw terminal or LEMO interface

• Operating temperature: –20 °C to +70 °C

• Protection rating: IP20 enclosure

Integrated System Performance (Probe + Converter)

When used as a complete measurement chain, the system provides stable long-term displacement monitoring with factory-matched calibration.

• Total measurement range: ±12 mm

• Resolution: 0.1 µm

• Frequency bandwidth: up to 10 kHz

• Output signals: 4–20 mA or 0–10 V

• High thermal stability across probe and electronics split architecture

• No field calibration required due to factory pairing

Engineering Applications

This measurement chain is widely implemented in high-energy rotating machinery where precise shaft position tracking is required:

• Steam and gas turbine axial displacement monitoring

• Compressor thrust position and rotor shift detection

• Gearbox thermal expansion compensation

• Bearing clearance and eccentricity analysis

• Shaft dynamic stability monitoring in high-speed systems

FAQ

Q: Does the system require calibration during installation?
A: No. The probe and converter are factory-matched and calibrated as a set.

Q: Can the output be directly connected to a PLC?
A: Yes. The CON021 provides standard 4–20 mA or 0–10 V industrial outputs.

Q: What is the maximum operating temperature for the probe?
A: The PR6426 probe supports up to +180 °C in continuous operation.

Q: Is this system suitable for high-speed turbines?
A: Yes. With a 10 kHz bandwidth, it is suitable for high-dynamic rotating machinery.