Overview

The PR6423 series probes are part of Emerson's comprehensive portfolio for machinery protection. The PR6423/00R-010 model features a 10 mm diameter threaded body with a standard 1-meter integral cable. It is designed for permanent installation in bearing housings or machine casings, with the tip positioned near the rotating shaft. The probe, together with the CON031 driver (which may include a signal conditioner and oscillator), generates a modulated RF signal that varies with the gap. This signal is converted to a DC voltage proportional to displacement, or to an AC signal representing vibration. The system provides high resolution and stability, essential for early fault detection.

Key Features

• Measuring principle: Eddy current, insensitive to oil, water, or dust in the gap.

• Linear range: 2 mm (typical) with sensitivity 8 V/mm (adjustable via driver).

• Frequency response: DC to 10 kHz, covering both static position and dynamic vibration.

• Probe construction: Stainless steel body, PPS tip, integral coaxial cable.

• Temperature range: Probe: -35°C to +180°C; CON031 driver: -35°C to +85°C.

• Output signal: -4 to -20 VDC (typical) for displacement; AC coupled for vibration.

• Approvals: ATEX, IECEx, CSA for hazardous areas (intrinsic safety).

• Compatibility: Directly interfaces with Emerson CSI 6500, AMS 6500, and third-party monitors.

Technical Specifications

• Model: PR6423/00R-010 (probe) + CON031 (driver/extension)

• Probe diameter: 10 mm threaded (M10x1)

• Linear range: 0.25 to 2.25 mm (typical)

• Sensitivity: 8 mV/µm (with recommended driver)

• Resolution: 0.1 µm

• Non-linearity: ±1% over full range

• Temperature drift: < 0.05% /°C

• Probe cable length: 1 m (integral), with CON031 providing up to 100 m extension

• Power requirement: -24 VDC (supplied by monitor)

• Hazardous area certification: Ex ia IIC T4 Ga (intrinsic safety)

• Protection rating: Probe IP68, CON031 IP67

Applications

The PR6423/00R-010 system is widely used in turbomachinery protection systems for steam turbines, gas turbines, compressors, pumps, and fans. It measures shaft radial vibration, axial thrust position, and shaft eccentricity. The data is used for machinery health monitoring, alarm generation, and automatic trip functions. It is also employed in condition monitoring programs for predictive maintenance, helping to detect issues such as unbalance, misalignment, and bearing wear before they cause failures.

Conclusion

The Emerson PR6423/00R-010 eddy current probe, combined with the CON031 driver, delivers accurate and reliable non-contact measurements essential for protecting critical rotating machinery. Its robust design and compatibility with Emerson monitoring systems make it a trusted choice for industries worldwide.