Product Overview

The BENTLY NEVADA 125840-01 is a precision-engineered 2-meter proximity probe extension cable designed exclusively for use with Bently Nevada’s 3300 and 3300 XL eddy-current sensor systems.This critical accessory enables flexible routing between the proximity probe(mounted on machinery)and the remote-mounted Proximitor®signal conditioner,while maintaining the calibrated electrical characteristics essential for accurate gap measurement.The BENTLY NEVADA 125840-01 is not a generic cable—it is an impedance-matched,double-shielded coaxial assembly that preserves signal linearity and noise immunity in accordance with API 670 standards for machinery protection.

When combined with a standard 5-meter integral-cable probe(e.g.,330103-00-05-…),the BENTLY NEVADA 125840-01 creates a complete 7-meter system,which must be paired with a 7-meter calibrated Proximitor(such as 3300/82-07-00).This configuration is widely used in turbines,compressors,and large motors where physical constraints prevent direct Proximitor mounting near the bearing housing.The BENTLY NEVADA 125840-01 ensures that the total electrical length remains consistent with factory calibration,eliminating measurement drift or nonlinearity that could compromise machine safety or diagnostic accuracy.

Technical Specifications

Parameter Name Parameter Value

Product Model 125840-01

Manufacturer BENTLY NEVADA(a Baker Hughes company)

Product Type Proximity probe extension cable

Length 2.0 meters

Total System Compatibility 7-meter(when used with 5 m probe)

Connector(Probe End)Miniature coaxial twist-lock(3300 XL compatible)

Connector(Proximitor End)Microdot(standard for 3300 XL Proximitors)

Shielding Dual-layer:aluminum foil+braided copper

Jacket Material Oil-resistant polyurethane(PUR),UV and abrasion resistant

Operating Temperature–30°C to+125°C

Impedance Match Factory-tuned to 3300 XL system specifications(~50Ω)

Compliance Standards API 670,CE,RoHS

Main Features and Advantages

Signal integrity under real-world industrial conditions is the defining strength of the BENTLY NEVADA 125840-01.Its dual shielding—comprising both foil and braid layers—effectively blocks electromagnetic interference(EMI)from variable-frequency drives,high-voltage cabling,and radio transmitters,ensuring clean analog signals reach the Proximitor without distortion.This is especially vital in refineries,steel mills,and power plants where electrical noise is pervasive.

The BENTLY NEVADA 125840-01 features rugged polyurethane jacketing that resists oil,coolant,ozone,and mechanical abrasion,enabling reliable performance in harsh environments where standard PVC cables would degrade.Both connectors are gold-plated and feature secure twist-lock mechanisms to prevent accidental disconnection due to vibration—a common failure point in rotating equipment monitoring systems.

Critically,the BENTLY NEVADA 125840-01 is manufactured to exacting impedance tolerances that match the 3300 XL platform’s requirements.Unlike aftermarket alternatives,it does not introduce capacitance or inductance shifts that alter the probe’s sensitivity or linear range.This guarantees that the full 2.0 mm measurement span remains accurate,supporting early detection of bearing wear,shaft bow,or rub conditions.For plant engineers,this means confidence in alarm validity and compliance with machinery protection mandates.

Application Field

The BENTLY NEVADA 125840-01 is indispensable in applications requiring extended probe-to-Proximitor distances without sacrificing measurement fidelity.In gas and steam turbine installations,it allows Proximitors to be mounted in accessible,cooler zones away from the hot turbine casing,while probes remain embedded in bearing pedestals.Similarly,in centrifugal compressors used in LNG or pipeline services,the BENTLY NEVADA 125840-01 facilitates routing through complex skid layouts where direct cable runs are impractical.

In hydroelectric generators and large synchronous motors,the 2-meter extension enables neat cable management across wide air gaps or through fire barriers,maintaining signal quality over the full 7-meter path.The cable’s resistance to hydraulic fluids and greases also makes it suitable for mining and cement kiln drives,where contamination is routine.Crucially,because the BENTLY NEVADA 125840-01 is part of a certified API 670-compliant system,it supports safety-critical shutdown logic in SIL-rated protection schemes—ensuring that vibration or position alarms trigger reliably when thresholds are exceeded.

Related Products

125840-02:4-meter extension cable(for 9-meter total systems with 5 m probe)

125840-03:5-meter extension(less common,for 10 m systems)

330103-00-05-10-02-00:Standard 5 m 8 mm probe(pairs with 125840-01 for 7 m system)

3300/82-07-00:7-meter calibrated Proximitor(required companion)

330901-00-00:M10 probe mounting adapter

3500/42M:Monitor module for integration into 3500 rack

3300 NSv Probes:Newer digital probes(not compatible with 125840-01)

Installation and Maintenance

Pre-installation preparation:Always confirm that the total system length—probe cable plus BENTLY NEVADA 125840-01 extension—matches the Proximitor’s calibration label(e.g.,“7M”).Inspect connectors for bent pins or contamination,and verify jacket integrity.Route the BENTLY NEVADA 125840-01 separately from power conductors;if parallel runs are unavoidable,maintain>30 cm separation or use grounded metallic conduit.Ground the cable shield at the Proximitor end only to prevent ground loops that induce noise.

Maintenance recommendations:Periodically examine the BENTLY NEVADA 125840-01 for jacket cracking,oil swelling,or connector corrosion—especially in high-humidity or chemical-exposure areas.Never attempt to repair or splice the cable;any modification destroys its calibrated impedance and voids API compliance.During system upgrades,ensure new Probes and Proximitors are length-matched to existing BENTLY NEVADA 125840-01 extensions.Label all cables clearly by length to avoid field mismatches during maintenance outages.

Product Guarantee

Every BENTLY NEVADA 125840-01 undergoes rigorous electrical and environmental testing to ensure seamless integration within Bently Nevada’s machinery monitoring ecosystem.We provide full documentation of impedance validation and material certifications,reinforcing compliance with global safety and reliability standards.Backed by a 24-month warranty,the BENTLY NEVADA 125840-01 is supported by expert application engineering and lifecycle services—because in critical asset protection,there’s no room for signal compromise.

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