Product Overview
When high-temperature environments cause premature sensor failure, the Bently Nevada 330301-000-011-50-90-00-05 3300 XL High Temperature Probe delivers reliable performance up to +350°C. Designed for continuous vibration and position monitoring in turbines, compressors, and other rotating machinery, this probe uses a 3/4-16 UNF thread mounting with a ceramic tip and AISI 316L stainless steel case. The 5.0-metre hardline cable and included 9.0-metre extension cable (without armor) provide flexible installation in confined spaces. Made in the USA, this probe is a direct replacement for legacy Bently Nevada 3300 XL series sensors.
Technical Specifications Breakdown
The following key parameters define the performance of the 330301-000-011-50-90-00-05:
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Incremental Scale Factor (ISF): 3.94 V/mm (100 mV/mil) ±9.65% including interchangeability error over the 4.0 mm (160 mil) linear range. This ensures accurate displacement measurement even when swapping probes.
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Deviation from Best Fit Straight Line (DSL): Less than ±78 µm (±3.1 mils) over the linear range, enabling precise readings.
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Extended Temperature Performance: Over 22°C to +350°C, the ISF stays within ±30% of nominal, and DSL remains within ±0.51 mm (±20 mils). This wide operating window reduces drift in high-heat applications.
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Frequency Response: 0 to 6 kHz (+0, -3 dB) typical with up to 305 metres of field wiring, allowing long cable runs without significant signal degradation.
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Probe DC Resistance: Center conductor to outer conductor (RpROBE) is 8.11 ohms for the 5.0 m probe length, ensuring consistent signal integrity.
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Recommended Minimum Target Size: 30.5 mm (1.2 in) diameter flat target and minimum shaft diameter of 152 mm (6.0 in) guarantee reliable proximity sensing.
The ceramic tip withstands high temperatures, while the stainless steel case resists corrosion. Total probe weight is 117 g/m of hardline cable plus 12 g/cm of case.
Real-World Applications
In gas turbine exhaust monitoring, the 330301-000-011-50-90-00-05 measures shaft vibration at temperatures exceeding 300°C. Its high linearity and stable ISF ensure that alarm thresholds remain accurate, preventing false trips. For steam turbine bearing vibration, the probe's extended temperature range eliminates the need for cooling adapters, simplifying installation. In hot-section compressor casing monitoring, the ceramic tip and stainless steel case resist thermal erosion, reducing maintenance frequency. These use cases align with the failure mode analysis angle: by choosing a probe that maintains spec over temperature, users avoid common failure modes like thermal drift and sensor degradation.
Installation & Setup Guidance
Mount the probe using the 3/4-16 UNF threads into a suitable boss or adapter. Ensure the target surface is clean, flat, and meets the minimum diameter requirement (30.5 mm). The unthreaded length option is 0 inches, so the case length of 1.1 inches determines the gap setting. Connect the 5.0 m hardline cable to the included 9.0 m extension cable (without stainless steel armor) for a total reach of 14.0 m. Use shielded twisted-pair wiring to the monitor and follow Bently Nevada recommended practice for air gap adjustment (typically 0.5 mm to 2.5 mm for the 4.0 mm linear range). Calibrate with the system monitor using the factory-set ISF; no field adjustment is required.
Selection Guide & Purchasing Advice
Before purchasing, verify your system's thread specification (3/4-16 UNF), total cable length requirement (the 9.0 m extension is included), and armoring preference (this unit has no armor). If your environment has mechanical abrasion, order a separate armoring kit. For original equipment replacement, confirm that the unthreaded length (0 in) and overall case length (1.1 in) match the existing installation. PLC Source PRO stocks this exact Bently Nevada 330301-000-011-50-90-00-05 probe with multiple agency approvals, ensuring immediate availability for critical spares programs.