EMERSON PR6424/000-100 CON021 Replacement for 3300 XL

Product Overview

EMERSON PR6424/000-100 CON021 Replacement for Bently Nevada 3300 XL: Smooth Transition & Legacy System Compatibility

Upgrading or replacing an eddy-current proximity probe in a live rotating machinery monitoring system is a precision-critical task. The EMERSON PR6424/000-100 CON021 is a factory-specification eddy-current proximity probe designed for the Bently Nevada 3300 XL Series vibration monitoring platform — one of the most widely deployed condition monitoring architectures in turbines, compressors, pumps, and rotating equipment across oil & gas, power generation, petrochemical, and heavy industrial facilities worldwide.

Whether you are replacing a failed probe in a critical machinery protection loop, retiring an end-of-life sensor from a legacy 3300 Series rack, or executing a planned maintenance window to restore full system redundancy, the PR6424/000-100 CON021 delivers a verified drop-in fit with no firmware changes, no recalibration of the monitoring rack, and no modification to existing conduit or junction box wiring.

Compatibility Comparison Table

Seamless Upgrade Solutions

A successful proximity probe replacement in a Bently Nevada 3300 XL system rarely involves the probe alone. In most field retrofit and upgrade scenarios, engineers also address the surrounding signal chain and rack infrastructure to ensure long-term reliability and system integrity.

The PR6424/000-100 CON021 probe pairs directly with the Bently Nevada 3300 XL 8-mm Extension Cable (CON021 suffix confirms the 1-metre armored extension), which routes the signal from the probe tip through conduit to the 3300 XL Proximitor® Sensor — the driver module that conditions the eddy-current signal and outputs a calibrated voltage to the monitor card. If the Proximitor® sensor (such as the 3300 XL 8 mm Proximitor® Sensor, P/N 330180) is also aged or suspect, replacing both the probe and driver simultaneously during the same maintenance window eliminates a second planned outage.

On the rack side, the conditioned signal feeds into a 3300 XL Dual Vibration Monitor or a 3300 XL Radial Vibration Monitor card seated in the 3300 XL Rack. If your facility is migrating from an older Bently Nevada 3500 Series rack architecture to a 3300 XL platform — or vice versa — note that the probe and extension cable assembly is system-specific; the 3500 Series uses a different Proximitor® driver and monitor card form factor, so probe selection must match the installed rack generation.

For facilities running parallel vibration and position monitoring, the PR6424/000-100 CON021 is commonly deployed alongside PR6424/000-100 CON011 (0.5 m extension) or PR6424/000-100 CON031 (1.5 m extension) probes on the same shaft, providing X-Y radial vibration measurement pairs and axial position sensing as required by API 670 machinery protection standards. Ensuring all probes in a measurement pair share the same cable suffix and calibration gap is essential for balanced sensitivity across the monitor channel.

Where wiring runs are long or signal integrity is a concern — particularly in high-EMI environments near variable frequency drives or large motor control centers — a signal isolator or barrier module may be inserted between the Proximitor® output and the monitor card input. This is especially relevant during brownfield upgrades where existing cable trays mix proximity probe signal cables with power conductors.

If your upgrade scope includes the operator interface layer, the 3300 XL monitor outputs are typically integrated into a DCS historian or safety instrumented system (SIS) via 4–20 mA or relay contacts, or via a System 1® Evolution software platform for real-time machinery diagnostics. Confirming that the new probe’s gap voltage and sensitivity align with the existing System 1® configuration prevents false alarms during commissioning.

Retrofit Guidance FAQ

Q: Can I install this probe without recalibrating the 3300 XL monitor card?
A: Yes. The PR6424/000-100 CON021 is factory-calibrated to the standard –200 mV/mil sensitivity curve for 3300 XL 8-mm systems. Provided the air gap is set correctly (typically 1.0 mm ± 0.1 mm for steel targets), no monitor card recalibration is required. Verify the gap voltage at the Proximitor® output terminal after installation.

Q: Is the wiring connection identical to the probe I am replacing?
A: Yes. The CON021 extension cable uses the standard Bently Nevada armored coaxial connector. The three-wire connection (shield, center conductor, and outer conductor) at the Proximitor® junction box is identical to all PR6424 series probes with the same cable suffix.

Q: What if my existing extension cable is damaged — do I need to replace the full assembly?
A: The probe tip and extension cable are a matched, factory-calibrated assembly and must not be mixed between units. If the extension cable is damaged, replace the complete PR6424/000-100 CON021 assembly. Do not splice or extend the coaxial cable, as this will alter the system capacitance and shift the calibration curve.

Q: Can this probe be used in a 3500 Series rack?
A: No. The 3300 XL and 3500 Series use different Proximitor® driver modules with different input impedance and power supply characteristics. Always match the probe assembly to the installed rack generation.

Q: How do I confirm the correct air gap during installation?
A: Use a calibrated DC voltmeter at the Proximitor® output. For a steel target, the nominal gap voltage at 1.0 mm is approximately –10.4 VDC. Adjust the probe mounting depth until the output falls within the linear range specified in the 3300 XL installation manual.

Q: What communication protocol does this probe use?
A: The PR6424/000-100 CON021 outputs an analog voltage signal — it is not a digital or fieldbus device. The signal is processed by the 3300 XL Proximitor® sensor and monitor card, which may then communicate upstream via Modbus, FOUNDATION Fieldbus, or proprietary Bently Nevada protocols depending on the monitor card variant installed in your rack.

Warranty Assurance

Every EMERSON PR6424/000-100 CON021 unit shipped from TOPNLMS is covered by a 12-month warranty from the date of delivery. Prior to dispatch, each probe assembly undergoes output sensitivity verification and visual inspection to confirm connector integrity, cable armor condition, and probe tip geometry.

If a unit is found to be defective within the warranty period, TOPNLMS provides replacement support with priority processing to minimize your equipment downtime. Our team responds to after-sales inquiries within one business day and can provide test data, calibration records, or shipping documentation upon request to support your incoming inspection process.

We maintain bonded stock of high-demand Bently Nevada 3300 XL series components to support urgent replacement orders. Standard lead time for in-stock units is 3–7 business days for international shipments from Xiamen, China, with DHL Express and FedEx Priority options available for critical plant shutdowns.

For procurement teams requiring formal quotations, material certifications, or country-of-origin documentation for customs clearance, please contact us directly. We support net-term purchasing arrangements for qualified industrial accounts.