Bently Nevada 3300 XL Probe 330101-00-27-50-02-05

Overview: The Sensing Element of Machinery Protection Systems

The Bently Nevada 3300 XL Probe, part number 330101-00-27-50-02-05, is the sensing probe component of the 3300 XL Proximity Transducer System, used for radial vibration and axial position measurement on fluid-film bearing machines throughout rotating equipment protection systems. This variant is configured for a 5-meter system length, designed for use with the corresponding 5-meter Proximitor sensor, and is part of the interchangeable 3300 XL probe family widely deployed across turbine, compressor, and pump condition monitoring installations.

As a trusted supplier of Bently Nevada machinery protection instrumentation, Seven Star LLC sources and supplies the 3300 XL probe to refineries, gas processing plants, and power generation facilities across Oman and the wider GCC. Because probe and Proximitor system length must match exactly for correct calibration, Seven Star LLC helps maintenance teams confirm the exact suffix code and system length required for their installed base.

Measurement Principle

The 3300 XL proximity transducer system generates an output voltage directly proportional to the distance between the probe tip and an observed conductive surface – typically a rotating shaft – enabling both static (position) and dynamic (vibration) measurement from the same sensing element. This eddy-current-based displacement principle allows continuous, non-contact monitoring of shaft position and radial vibration without any physical wear on the measurement point itself, a critical requirement for machinery that must run continuously between major overhauls.

The probe’s linear range extends 2 mm (80 mils) from approximately 0.25 mm to 2.3 mm (10 to 90 mils) from the target, with an incremental scale factor of 7.87 V/mm (200 mV/mil) ±5% for the 5-meter system configuration. The recommended radial vibration gap setting is -9 Vdc (approximately 1.27 mm / 50 mils), and deviation from the best-fit straight line is held to ±0.025 mm (±1 mil), giving the probe the precision required for both routine condition monitoring and machinery protection trip logic.

Engineering Design of the 3300 XL Probe

The 3300 XL probe and extension cable incorporate two patented design improvements over earlier probe generations: a TipLoc molding method that provides a more robust bond between the probe tip and probe body, and a CableLoc cable design that delivers 330 N (75 lbf) pull strength to more securely attach the probe cable to the probe tip. The probe tip itself is molded from polyphenylene sulfide (PPS), while the probe case is constructed from AISI 303 or 304 stainless steel, rated for an operating and storage temperature range of -52°C to +177°C (-62°F to +350°F).

This 330101 series probe is supplied with a 3/8-24 UNF thread without armor, configured for the 5-meter system length, and the -05 approval option code indicates CSA, ATEX, and IECEx hazardous-area certification, making it suitable for installation in classified areas common to refinery and gas processing rotating equipment. A miniature coaxial ClickLoc connector terminates the standard cable, ensuring reliable, repeatable connection to the mating 5-meter Proximitor sensor cable.

Each field of the part number is an ordering option, and reading it correctly is the difference between a drop-in spare and an unusable one. In 330101-00-27-50-02-05 the leading 330101 designates a 3300 XL 8 mm probe with 3/8-24 UNF thread and no armor; option A = 00 is an unthreaded length of 0.0 in; option B = 27 is an overall case length of 2.7 in; option C = 50 is a total length of 5.0 metres (16.4 ft); option D = 02 is a miniature coaxial ClickLoc connector with standard cable; and option E = 05 is the CSA, ATEX and IECEx agency approval package. Bently Nevada states plainly that 5-metre probes are designed for use with the 5-metre Proximitor sensor only, so the C field must be matched to the installed sensor and cannot be substituted with a 1-metre or 9-metre probe on the assumption that a longer or shorter cable is electrically harmless.

Key Features

The Bently Nevada 3300 XL Probe delivers precise, reliable non-contact shaft measurement in a 5-meter system configuration. Key characteristics include:

• 2 mm (80 mil) linear measuring range with ±0.025 mm deviation from best-fit straight line.
• Designed specifically for use with the 5-meter Proximitor sensor system.
• TipLoc molded tip bond and CableLoc cable retention (330 N / 75 lbf pull strength).
• 3/8-24 UNF thread, without armor, miniature coaxial ClickLoc connector.
• PPS probe tip and AISI 303/304 stainless steel case construction.
• CSA, ATEX, and IECEx hazardous-area approvals (option -05).
• Full interchangeability with existing 3300 XL 5-meter Proximitor systems.

Installation Geometry, Torque and Sealing

An eddy-current probe measures a volume of target material, not a point, so the target geometry is part of the calibration. The Bently Nevada 3300 XL Probe requires a minimum flat target of 15.2 mm (0.6 in) diameter, a minimum shaft diameter of 50.8 mm (2 in) and a recommended minimum of 76.2 mm (3 in); measurements on shafts smaller than 76.2 mm will generally change the scale factor away from the nominal 200 mV/mil. Where two probes are installed close together, their electromagnetic fields interact and produce cross-talk, so Bently Nevada specifies a minimum tip separation of roughly 40 mm (1.6 in) for axial position measurements and 38 mm (1.5 in) for radial vibration measurements to hold cross-talk below 50 mV. System frequency response is 0 to 10 kHz at +0 / −3 dB with up to 305 metres (1,000 feet) of field wiring between the Proximitor sensor and the monitor.

Mechanical installation is equally prescriptive. The probe case has a maximum rated torque of 33.9 N·m (300 in·lbf) with a recommended tightening torque of 11.2 N·m (100 in·lbf), reduced to 22.6 N·m maximum and 7.5 N·m recommended across the first three threads where the risk of cross-threading is highest. Connector-to-connector assembly is finger tight between two 3300 XL gold ClickLoc connectors — no tooling — with an absolute maximum connector torque of 0.565 N·m (5 in·lbf), and the cable must never be bent tighter than a 25.4 mm (1.0 in) radius. The probe seals differential pressure between tip and case using a Viton O-ring, but Bently Nevada notes that probes are not pressure-tested before shipment and that strongly acidic or alkaline media can erode the tip assembly; where the process fluid is aggressive or the sealing function is safety-relevant, request a pressure-seal test at the ordering stage rather than assuming one has been performed.

Industrial Applications

The 3300 XL probe is deployed across turbines, centrifugal compressors, pumps, and other fluid-film bearing machinery in refineries, gas processing plants, and power generation facilities, providing the radial vibration and axial position data that machinery protection and condition monitoring systems depend on. The 5-meter system length variant is specified where the installation distance between probe and Proximitor sensor requires this longer cable run.

Seven Star LLC supports refinery instrumentation teams, gas processing operators, and power plant maintenance departments across Oman, Muscat, Sohar, and the broader GCC region with sourcing of Bently Nevada 3300 XL probes, helping plants maintain continuous, reliable machinery protection coverage.

Technical Specifications

The table below summarizes the core specifications of the Bently Nevada 3300 XL Probe as supplied by Seven Star LLC.

330101-00-27-50-02-05 Ordering Fields and Neighbouring Options

The 330101 family uses the pattern 330101-AA-BB-CC-DD-EE. Field A (unthreaded length) and field B (overall case length) are both specified in 0.1 inch steps: A runs from 0.0 to 8.8 in and B from 0.8 to 9.6 in, with A at least 0.8 in shorter than B. Here A = 00 gives a fully threaded case and B = 27 gives a 2.7 in case. Field C lists 05, 10, 15, 20, 30, 50 and 90 for 0.5, 1.0, 1.5, 2.0, 3.0, 5.0 and 9.0 metres; the 30 option exists only on 330101 and belongs to the 9 metre sensor.

Field D sets connector and cable style: 01 is a ClickLoc connector with connector protector on standard cable, 02 is the plain ClickLoc connector on standard cable, 11 is the protector version on FluidLoc cable and 12 the plain connector on FluidLoc cable. Field E is either 00 (no approvals required) or 05 (CSA, ATEX and IECEx approvals). The sister base numbers are 330102 (same 3/8-24 UNF thread with armor), 330103 and 330104 (M10 × 1, without and with armor) and the extended temperature equivalents 330191 and 330192.

Because field C is 50, this probe carries the complete 5.0 metre electrical length in its own lead. It connects directly to a 5 metre 3300 XL Proximitor Sensor (330180-50, -51 or -52) and no 330130 extension cable is inserted, since probe plus extension length must equal the sensor length. The integral lead has a +20%, -0% length tolerance, so allow for surplus cable when planning conduit and junction box space. A healthy 5.0 metre probe measures about 8.73 Ω between center and outer conductor.

Hazardous Area Installation and Thread Engagement Notes

Thread engagement in the bracket or housing should not exceed 0.563 in for the 3/8-24 thread; longer engagement can bind during installation. When only the first three threads are engaged, torque drops to 7.5 N.m recommended and 22.6 N.m maximum. Standard brackets are 137492-01 (aluminum, 3/8-24) and 27474-01 (phenolic, for electrical isolation), and accessory lock nut 04301007 adds safety wire holes.

In hazardous areas the 05 probe is certified as part of a system: entity parameters are met only with Bently Nevada extension cables and Proximitor sensors, installed to drawing 141092 for intrinsically safe circuits or 140979 for non-incendive circuits. The permitted ambient at the probe depends on temperature class, from +40 °C for T5 up to +232 °C for T1. A Viton O-ring seals the tip to the case, yet probes are not pressure tested before shipment, and temperatures below -34 °C can shorten seal life.

Request a Quote for Bently Nevada 3300 XL Probe 330101-00-27-50-02-05

Seven Star LLC supplies the Bently Nevada 3300 XL Probe with datasheet documentation and regional technical support. Contact our instrumentation division for a formal B2B quotation, to confirm the correct probe and system length configuration for your existing 3300 XL installation, or to obtain the complete technical datasheet.Seven Star LLC supplies this item on request with the manufacturer documentation, and availability and lead time are confirmed at quotation.

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See also: Bently Nevada 330400 Accelerometer Acceleration Transducer.