Product Introduction
When machine vibration monitoring is compromised by probe failure, the Bently Nevada 330191-40-75-10-CN proximity probe offers robust solutions. This 3300 XL 8 mm ETR probe is designed for reliable shaft vibration and position measurement in critical rotating machinery. The model 330191-40-75-10-CN features a 3/8-24 UNF thread, without armor, and a total length of 1.0 meter (3.3 feet). It incorporates patented TipLoc molding and CableLoc design to provide a more robust bond between probe tip and body, as well as 330 N (75 lbf) pull strength to prevent cable detachment.
Technical Specifications Breakdown
The Bently Nevada 330191-40-75-10-CN proximity probe delivers precise performance through key specifications derived from the ordering number. The unthreaded length is 4.0 inches, the overall case length is 7.5 inches, and the total length is 1.0 meter. Agency approval option CN indicates country-specific approval.
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Power Requirements: -17.5 Vdc to -26 Vdc when installed with nonincendive circuit, or -23 Vdc to -26 Vdc with barriers.
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Supply Sensitivity: Less than 2 mV change in output voltage per volt change in input voltage.
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Output Resistance: 50 Ω.
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Probe DC Resistance (RPROBE): 7.59 ± 0.50 Ω at 1.0 m length.
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Probe Tip Material: Polyphenylene sulfide (PPS).
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Probe Case Material: AISI 303 or 304 stainless steel.
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Tensile Strength: 330 N (75 lbf) from probe case to lead, 270 N (60 lbf) at lead to extension cable connectors.
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Connector Material: Gold-plated brass or gold-plated beryllium copper.
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Maximum Connector Torque: 0.565 N•m (5 in•lbf).
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Probe Case Thread: 3/8-24 with maximum thread engagement of 0.563 inches.
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Temperature Range: For EPL Ga and Gc, ambient temperature from -55°C to +232°C (T1 classification) down to -55°C to +40°C (T5). For EPL Dc, T280°C at Ta -55°C to +232°C, etc.
Industry Applications
In gas turbines, compressors, and pumps, the Bently Nevada 330191-40-75-10-CN probe provides critical shaft proximity data. The 8 mm probe body offers thicker encapsulation and a more rugged case, recommended for environments prone to physical abuse. The optional FluidLoc cable prevents oil leakage through the cable interior, making it suitable for oil-mist applications. One-meter systems do not require an extension cable, simplifying installation.
Installation & Setup Guidance
Mount the 330191-40-75-10-CN probe using the 3/8-24 UNF thread. Ensure proper thread engagement: maximum 0.563 inches to avoid bottoming. Connect via 75Ω triaxial cable (FEP or PFA insulation) to a compatible Bently Nevada proximitor. For nonincendive installations, power supply must be between -17.5 Vdc and -26 Vdc. Operation above -23.5 Vdc can reduce linear range, so verify voltage levels. Torque connectors to 0.565 N•m maximum. Use Viton O-ring for pressure sealing; probes are not pressure tested prior to shipment.
Maintenance & Reliability
The patented TipLoc and CableLoc designs minimize common failure modes such as tip detachment and cable pull-out. Inspect probe cable and connectors regularly for damage. The probe body's stainless steel case resists corrosion. For extended temperature ranges, use PFA-insulated cable. Temperature schedules provide guidance for ambient limits—check T-classification for your environment. The 330191-40-75-10-CN probe's robust construction reduces unplanned downtime and replacement costs.
Selection Guide & Purchasing Advice
Before purchasing the Bently Nevada 330191-40-75-10-CN, verify compatibility with your existing proximitor and extension cable (if length exceeds 1.0 m). Confirm thread type (3/8-24) and required length options. This model is without armor; optional armor is available in AISI 302/304 SST with FEP jacket. For genuine parts with full warranty, choose PLC Source PRO as your trusted supplier. We stock new and original factory-packed units with 12-month factory warranty.