Product Short Description

Product Overview

This complete measurement assembly combines the PR6423003-030 extended-length eddy current proximity probe and matching CON021 isolated signal conditioner, delivering a full calibrated non-contact shaft vibration and thrust position measurement solution. The PR6423/003-030 variant features a longer integral cable length compared to the PR6423000-111 model, while the CON021 is a standalone DIN-rail mounted signal conditioner that generates excitation power for the probe coil and converts eddy current impedance variation into standard linear voltage output compatible with all Emerson monitoring racks, PLC analog input modules and data acquisition systems.
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Emerson PR6423003-030

Description

Core Technical Specifications

PR6423003-030 Probe Subassembly

  • Sensing Range: 0–2.0mm linear gap measurement window
  • Sensitivity: Standard 7.874 V/mm linear output slope, factory calibrated matched to CON021
  • Integral Cable Length: 3m molded double-shielded fluorosilicone cable
  • Probe Tip Diameter: 8mm stainless steel non-magnetic target tip
  • Operating Temperature: Tip -35°C ~ +175°C; integral cable -35°C ~ +125°C
  • Mounting Thread: M10×1 metric precision thread
  • Connector: Hermetically sealed 4-pin microdot extension connector
  • Linearity Error: ≤±1.25% full measurement scale

CON021 Signal Conditioner Subassembly

  • Power Supply Input: 24VDC industrial control power, operating range 18–30VDC, power consumption 2.2W
  • Excitation Output: High-frequency constant current drive signal matched to PR6423 probe coil impedance
  • Analog Output Signal: 0–16VDC linear displacement voltage output, short-circuit protected
  • Galvanic Isolation: 1500Vrms isolation between probe field wiring side and monitoring system output side
  • Diagnostic Functions: Built-in fault detection for open probe cable, short-circuit coil, out-of-range gap condition with fault relay contact output
  • Mounting Standard: TS35 standard DIN rail snap-on installation
  • Operating Temperature Range: -20°C ~ +70°C cabinet ambient temperature
  • Physical Dimensions: 122mm height × 30mm width × 110mm depth; unit weight 280g
  • Terminals: Screw-clamp terminals for power supply, probe cable, analog output and fault alarm relay

Function & Performance Features

PR6423003-030 Probe

  1. 3-meter factory integral cable eliminates need for intermediate extension cable joints in deep bearing housing installations, reducing signal interference points
  2. High-temperature titanium probe body with ceramic epoxy sealed coil assembly tolerates continuous high heat inside heavy-duty turbomachinery
  3. Double-layer braided shield cable rejects strong electromagnetic noise from nearby high-current power equipment
  4. ATEX intrinsically safe rated for installation inside flammable gas process zone environments
  5. Standardized M10 mounting thread compatible with all Bently Nevada probe mounting brackets and bearing housing fittings

CON021 Signal Conditioner

  1. Integrated diagnostic logic continuously monitors probe circuit integrity; triggers fault relay alarm for broken cable or shorted coil
  2. Galvanic isolation barrier blocks ground loop noise between field machinery probe and central control room monitoring hardware
  3. Adjustable static gap offset trim potentiometer on front panel for fine calibration of shaft rest gap voltage signal
  4. Short-circuit protection on analog output prevents damage to unit when wiring faults occur on downstream monitoring equipment
  5. Compact DIN rail form factor allows dense multi-channel mounting inside small vibration monitoring cabinets
  6. No external cooling fan required; fully passive convection cooling design with zero moving wear parts
  7. Standard linear voltage output directly compatible with PLC 4–20mA signal converters, SCADA analog input cards and portable vibration test instruments

Working Principle

The CON021 conditioner draws 24VDC control power and generates stable high-frequency excitation current sent to the PR6423 probe coil via the 3-meter integral cable. Eddy currents induced on the rotating metal shaft alter probe coil impedance proportionally to shaft-probe gap distance. The conditioner internal analog circuit converts impedance changes into a linear DC voltage output signal scaled to 7.874 V/mm sensitivity. Built-in fault detection circuitry measures coil loop resistance continuously; if resistance falls outside factory calibrated range (open/short cable), a mechanical relay contact closes to trigger cabinet alarm indicators or interlock logic. The galvanic isolation circuit separates field-side probe wiring from control-room side analog output to eliminate common-mode electrical noise that distorts vibration measurement data. Adjustment trim pot on the front panel modifies baseline DC offset voltage to calibrate the static cold shaft gap position before machine startup.

Material & Structural Composition

PR6423003-030 Probe

  • Sensing tip: Non-magnetic high-temperature stainless steel alloy
  • Probe housing: Lightweight corrosion-resistant titanium alloy
  • Internal coil sealant: High-temperature ceramic epoxy compound, resistant to thermal cycling expansion
  • Cable outer sheath: Fluorosilicone heat and oil resistant polymer
  • Cable shielding: Inner copper foil full coverage shield + outer braided copper mesh secondary shield
  • Microdot connector: Hermetic glass-metal sealed terminal to block oil, steam and dust ingress

CON021 Signal Conditioner

  • Outer housing: Flame-retardant V0 grade ABS engineering plastic with integrated DIN rail snap clip
  • Internal PCB: Double-sided FR4 industrial circuit board with conformal coating for dust and moisture resistance
  • Core electronic components: High-frequency oscillator excitation circuit, isolated operational amplifiers, fault detection resistive sensing network, mechanical alarm relay
  • Terminal blocks: PA66 flame retardant plastic screw terminals separated into power, probe input, analog output and fault relay wiring zones
  • Front panel interface: Recessed calibration trim potentiometer, transparent plastic dust cover for adjustment access

Installation Requirements

  1. Mount PR6423 probe via M10 threaded bearing housing port, lock nut torque limited to 3–4 N·m to avoid epoxy seal cracking
  2. Maintain minimum 25mm bend radius for all 3m integral probe cable runs; avoid crushing cable under machine mounting hardware
  3. Install CON021 conditioner on TS35 DIN rail inside sealed control cabinet, reserve minimum 15mm horizontal clearance between adjacent modules for heat dissipation
  4. Separate probe field wiring from three-phase power cables with 50mm minimum routing distance to reduce EMI interference
  5. Probe cable shield single-end grounding at CON021 input terminal only; double grounding creates ground loop measurement noise
  6. After mechanical probe gap adjustment, use front panel trim potentiometer on CON021 to calibrate static gap output voltage to mid-scale linear range
  7. Route analog output signal cables from CON021 to monitoring racks using shielded twisted pair wiring with single-point cabinet ground termination

Typical Application Scenarios

  • Long-distance bearing housing installations requiring extended probe cable length for steam and gas turbines
  • Petrochemical turbo-expander and high-speed process compressor vibration monitoring cabinets
  • Offshore platform gas compressor safety protection and predictive maintenance systems
  • Hydroelectric generator large thrust bearing axial displacement measurement
  • Industrial heavy-duty centrifugal pump critical bearing vibration monitoring with remote control room signal transmission

Mandatory Operation & Maintenance Precautions

  1. Disconnect 24VDC supply to CON021 before opening cabinet wiring terminals for inspection or re-calibration
  2. Avoid cutting, splicing or repairing the 3-meter factory molded integral probe cable; splices break calibrated double-shield construction
  3. Conduct annual inspection of probe cable outer sheath for oil swelling, cracking or heat degradation during machinery overhaul
  4. Do not scratch or dent the stainless steel probe sensing tip surface; surface damage permanently impairs linear measurement accuracy
  5. When troubleshooting vibration signal noise, first verify single-point shield grounding before adjusting CON021 calibration trim potentiometer
  6. Store spare PR6423 probes in temperature-controlled dry anti-static packaging to prevent coil epoxy moisture degradation
  7. In hazardous classified installation areas, install certified ATEX safety barriers between CON021 and PR6423 probe per regional electrical safety standards
  8. Do not mount CON021 directly adjacent to high-power variable frequency drives to avoid induced electrical noise interfering with analog output signals

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