Emerson PR6423 eddy current displacement transducer system

Here's a technical overview of the Emerson PR6423 eddy current displacement transducer system, part of the CSI 6500 Machinery Health™ monitoring platform:

Emerson PR6423/.. Series

Non-Contact Eddy Current Displacement Transducer

(For vibration, position, and eccentricity monitoring)

1. System Components

Component Model Example Function

Probe PR6423-00x (e.g., 002) Eddy current sensor (5mm/8mm dia.) for gap measurement

Extension Cable CA6423-xxx Low-noise coaxial cable (5m/9m standard)

Converter CON021/041 Signal conditioner (converts gap voltage to 4–20mA/VDC)

2. Key Specifications

Parameter Specification

Measurement Range 0.5–2.5 mm (typical) ±1mm linear range common

Probe Diameter 5mm (PR6423-00x) / 8mm (PR6423-01x)

Output Signal 4–20mA DC (CON021) / -2 to -18VDC (CON041)

Sensitivity 8 mV/μm (typical)

Frequency Response 0–10 kHz (±3dB)

Operating Temp Probe: -30°C to +150°C (standard) / +350°C (high-temp version)

Environmental IP67 (probe) / ATEX/IECEx certified options

3. Working Principle

Measures distance via electromagnetic induction between probe tip and conductive target.

4. Typical Applications

Shaft Vibration Monitoring:

Radial/axial displacement in turbines, compressors, pumps

Position Measurement:

Valve stem position, thrust bearing wear

Eccentricity Detection:

Slow-roll monitoring during startup/shutdown

Asset Protection:

Trigger alarms/trips on excessive vibration (API 670 compliant)

5. Configuration Notes

Probe Gap Calibration:

Target Material: Calibrated for carbon steel (requires K-factor for SS/other metals)

Installation Gap: Typically 1.0–1.5 mm (mid-scale)

Cabling Constraints:

Max cable length: 305m (1000 ft) with CA6423 cable

Avoid parallel runs with power cables (>30cm separation)

Converter Wiring:

CON021: 2-wire loop-powered (4–20mA + 24V DC)

CON041: 3-wire (-24V DC supply, -2 to -18V DC output)

6. Ordering Reference

Part Type Example P/N Description

5mm Probe PR6423-002-021 5mm × 25mm, 5m cable, M20 connector

8mm Probe PR6423-011-081 8mm × 35mm, 9m cable

Extension Cable CA6423-090-000 9m low-noise coaxial

Converter CON021-000 4–20mA signal conditioner