Bently Nevada 3300 XL 8mm Proximity Probe – 330101-00-27-50-02-05

Overview: The Long-Length Variant of a Proven Vibration Monitoring Standard

The Bently Nevada 3300 XL 8mm Proximity Probe, part number 330101-00-27-50-02-05, is the 5.0-meter total-length variant of the 330101 series probe within the 3300 XL Proximity Transducer System, an industry-standard platform for continuous vibration and position monitoring on fluid-film bearing machines. This longer probe length accommodates installations where the Proximitor sensor must be mounted further from the sensing point, such as machines with deep bearing housings or where cable routing constraints require additional length between probe tip and sensor.

As an authorized supplier of Bently Nevada machinery protection instrumentation, Seven Star LLC sources and supplies the 3300 XL 8mm proximity probe in its various length configurations to refineries, gas processing plants, and power generation facilities across Oman and the wider GCC. Because 5-meter probes are specifically designed for use with the matching 5-meter Proximitor sensor, Seven Star LLC helps engineering teams confirm the correct length-matched combination for their machinery protection system.

Measurement Principle

Like all probes in the 3300 XL family, the 330101-00-27-50-02-05 operates on the eddy current principle: a radio-frequency signal from the Proximitor sensor travels down the probe’s coaxial cable to a coil in the probe tip, generating a high-frequency electromagnetic field. A conductive target within this field induces eddy currents that draw energy from the field in proportion to the gap distance, and the Proximitor sensor demodulates this energy loss into a DC output voltage linear with gap distance across the probe’s rated range.

The 5-meter probe and cable length option is specifically engineered to work with the corresponding 5-meter Proximitor sensor, maintaining the same accurate, interchangeable performance as shorter-length systems, without requiring individual component matching or bench calibration when installed as a matched set. This length-matching requirement is why Bently Nevada specifies probe, cable, and sensor as a coordinated system rather than independently interchangeable components across different length classes.

Engineering Design of the 3300 XL Probe

This probe shares the same patented TipLoc molding and CableLoc cable termination technology as the rest of the 330101 series, providing a robust bond between probe tip and body along with 330 N (75 lbf) of cable pull strength. The probe tip is molded from polyphenylene sulfide (PPS) and the case is constructed from AISI 303 or 304 stainless steel, giving the probe the chemical and thermal resistance required for demanding process environments over its extended cable run.

Rated for an operating and storage temperature range of -52°C to +177°C (-62°F to +350°F), the probe maintains a 2 mm (80 mil) linear range from approximately 0.25 mm to 2.3 mm (10 to 90 mils) from the target. The -05 suffix indicates CSA, ATEX, and IECEx hazardous-area approvals, making this longer-length probe suitable for classified areas where the Proximitor sensor must be mounted at a greater distance from the probe tip, such as junction boxes located outside a hazardous zone boundary.

The complete probe, extension cable, and Proximitor sensor system is factory calibrated to produce a nominal incremental scale factor of 7.87 V/mm (200 mV/mil) within a ±5% interchangeability tolerance for standard 1-meter and 5-meter systems, with deviation from a best-fit straight line held to less than ±0.025 mm (±1 mil) across the linear range. This factory calibration is referenced to an AISI 4140 steel target; where the installed target material differs, Bently Nevada issues a material correction factor so the displayed gap voltage continues to represent true mechanical clearance rather than an uncorrected material-dependent offset.

Cabling, Connectors, and Field Wiring for the Bently Nevada 3300 XL

Between the probe tip and the Proximitor sensor, the 330101-00-27-50-02-05 uses a 75 Ω triaxial cable with fluoroethylene propylene (FEP) insulation, terminated at the sensor end in a gold-plated ClickLoc connector that locks into place with only finger-tight torque, simplifying field replacement without specialized tooling. Field wiring from the Proximitor sensor onward to the monitor rack is typically 0.2 to 1.5 mm² (16 to 24 AWG) three-conductor shielded triad cable, and the overall probe-cable-sensor-to-monitor run can extend up to 305 meters (1,000 feet), giving instrumentation designers flexibility to route signal cable well away from high-vibration or high-temperature areas of the machine while keeping the Proximitor sensor at a safe, accessible junction point.

Output impedance at the Proximitor sensor is 50 Ω, matching standard monitor input requirements without an external buffer, and the same 3/8-24 UNF or metric M10 x 1 threaded mounting is available across the 330101 probe family, with a maximum thread engagement of 0.563 in (3/8-24) or 15 mm (M10 x 1) to prevent tip damage from over-insertion. Reverse-mount variants of the same probe platform are also offered under part series 330105 (3/8-24) and 330106 (M10 x 1) for installations where cabling must exit the probe body in the opposite direction, giving mechanical engineers additional routing flexibility when retrofitting the 3300 XL system onto existing machinery.

Key Features

The Bently Nevada 3300 XL 8mm Proximity Probe (5.0 m variant) extends proven machinery protection sensing to longer cable-run installations. Key characteristics include:

• 5.0-meter total length, designed for use with the matching 5-meter Proximitor sensor.
• Eddy current sensing principle providing non-contact position and vibration measurement.
• Patented TipLoc molding and CableLoc cable termination for robust field durability over longer runs.
• 2 mm (80 mil) linear range with standard incremental scale factor performance.
• Operating and storage temperature range of -52°C to +177°C.
• CSA, ATEX, and IECEx approvals for hazardous-area installation (per -05 suffix).
• PPS probe tip material with AISI 303/304 stainless steel case construction.

Industrial Applications

The 5-meter 3300 XL 8mm proximity probe is deployed on fluid-film bearing machines where the Proximitor sensor must be located a greater distance from the probe tip, such as large turbines and compressors with junction boxes positioned outside a hazardous area boundary, or installations with restrictive cable routing between the bearing housing and the instrumentation cabinet. It supports the same continuous radial vibration and shaft position monitoring role as shorter probes within the 3300 XL family.

Seven Star LLC supports refinery instrumentation teams, power generation engineers, and rotating equipment maintenance departments across Oman, Muscat, Sohar, and the broader GCC region with sourcing of Bently Nevada 3300 XL proximity probes across all standard length configurations, helping plants maintain continuous, reliable machinery protection coverage.

Technical Specifications

The table below summarizes the core specifications of the Bently Nevada 3300 XL 8mm Proximity Probe (5.0 m variant) as supplied by Seven Star LLC.

Request a Quote for Bently Nevada 3300 XL 8mm Proximity Probe – 330101-00-27-50-02-05

Seven Star LLC supplies the Bently Nevada 3300 XL 8mm Proximity Probe with full manufacturer documentation and regional technical support. Contact our instrumentation division for a formal B2B quotation, to confirm the correct matched probe, cable, and Proximitor sensor length combination for your machinery protection system, or to obtain the complete technical datasheet. Seven Star LLC ensures every unit shipped across Oman and the GCC is genuine Bently Nevada hardware, correctly specified, and backed by local support.

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