EPRO PR6423/058-110 Proximity Sensors

The Emerson Epro PR6423/058-110, also cataloged as the PR6423 Eddy Current Sensor System, operates as a dedicated hardware component for non-contact shaft displacement, position, and vibration measurement within machinery protection and API 670 monitoring networks.

Suffix Breakdown & Model Matrix

The PR6423 system configuration utilizes specific model matrix ordering codes to define probe tip sizing, thread geometry, integral cable construction, and signal conditioning options:

• PR6423: Core eddy current sensor platform designed for machinery vibration and axial positioning.
• /058-110: Model option suffix specifying thread casing options, cable length, and matched interface compatibility with CON series signal conditioning converter modules.
• PR6426/000-010: High-range 10 mm tip probe variant utilized within extended diameter sensor applications.
• CON021: Signal conditioning converter module operating with PR6426 series probes to convert high-frequency oscillator signals into linearized voltage outputs.

Hardware Specifications

4-20 mA HART Loop Protocol & Galvanic Isolation

The Emerson Epro PR6423/058-110 sensor system interfaces with process transmitters and DCS hardware supporting the 4-20 mA HART loop protocol for dynamic signal re-transmission and remote diagnostic tracking. High-frequency shaft movement and gap changes modulate the carrier frequency, providing dynamic raw signals alongside HART digital data for monitoring overall machinery health.

In multi-channel monitoring installations, the paired signal conditioning hardware incorporates channel-to-channel isolation. This galvanic isolation prevents common-mode noise corruption, eliminates ground loop interference between adjacent orthogonal x-y probe channels on turbo-machinery bearing housings, and maintains signal fidelity across processing loops.

Frequently Asked Questions

Q: What is the power supply requirement for the CON021 converter module paired with this sensor system?

A: The CON021 signal conditioner requires a nominal negative DC supply voltage ranging between -23 VDC and -32 VDC.

Q: What minimum shaft diameter is recommended for the 10 mm tip probe configuration?

A: For optimal magnetic flux coupling without edge-effect distortion, the minimum shaft diameter should be at least 35 mm.

Field Installation Guidelines

1. Mount the probe body into the bearing housing or mounting bracket using specified thread torque to prevent drift from machinery vibration.
2. Adjust the initial mechanical gap to approximately 1.0 mm or until the converter output voltage reaches the nominal midpoint gap voltage.
3. Ensure the CON021 converter module is mounted in an IP20-rated enclosure or terminal cabinet with ambient temperatures maintained between -30 and +100 deg C.
4. Route signal cables in grounded metallic conduit, keeping sensor wiring separate from high-voltage motor power leads by at least 300 mm.