Bently Nevada 330780-50-00 is a high-performance 3300XL 11mm Proximitor Sensor under Baker Hughes’ machinery condition monitoring portfolio, designed for non-contacting vibration, displacement, and position measurements in industrial equipment like fluid film bearing machines, steam turbines, and reciprocating compressors. As a critical component of the 3300 XL 11mm Proximity Transducer System, it works seamlessly with compatible 3300 XL 11mm probes and extension cables to deliver reliable data for predictive maintenance, ensuring equipment safety and operational efficiency. This sensor meets global industry standards, including EMC, RoHS, and SIL 3 functional safety requirements, making it suitable for harsh environments in oil and gas, power generation, maritime, and offshore sectors.
Bently Nevada 330780-50-00 belongs to the 3300 XL series of proximity sensors, developed by Bently Nevada—a leading brand in machinery condition monitoring and a business unit of Baker Hughes. Originating from the USA, the sensor is widely available through authorized suppliers such as PLC DCS Pro Ltd., Runto Electric, and Topbrands PLC Limited, many of which list it as “in stock” with typical inventory levels (e.g., 1000 units at Topbrands PLC Limited). It comes with a 12-month warranty, ensuring long-term performance support. The shipping weight ranges from 2kg to 3kg depending on the supplier, while the actual weight of the sensor itself (excluding packaging) is approximately 0.82kg, facilitating easy integration into existing monitoring setups.
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Core Technical Specifications
Measurement Performance
The Bently Nevada 330780-50-00 operates on the eddy current principle, enabling non-contacting measurements that eliminate wear on target components like shafts, ideal for long-term stable monitoring. It supports a standard linear measurement range of 0.5 to 4.5mm (20 to 180 mils), corresponding to an output voltage range of -1 to -17Vdc, and an extended Deviation from Straight Line (DSL) range of 0.5 to 5.0mm (20 to 200 mils) with an output of -1 to -19Vdc—note that the extended range is not applicable when using zener barriers. The sensor excels in measuring key parameters such as shaft eccentricity, radial/axial vibration, axial thrust position, Keyphasor (phase reference) signals, and tachometer/zero speed data.In terms of accuracy, it delivers a precision of ±2% full scale and a resolution of 0.1mm (0.004in). The Incremental Scale Factor (ISF) is 3.94V/mm (100mV/mil) with a tolerance of ±10%, including interchangeability error when measured in 0.5mm increments over the 4.0mm linear range. The Deviation from Straight Line (DSL) is less than ±0.10mm (±4 mils) for the standard range and ±0.15mm (±6 mils) for the extended range. It maintains a frequency response of 0 to 8kHz (+0, -3dB typical) even with field wiring lengths up to 305 meters (1000 feet), ensuring consistent data capture across large industrial setups.
Electrical Parameters
The sensor requires a power supply of -23Vdc to -26Vdc (with barriers), and operation at a voltage more positive than -23.5Vdc may reduce the linear range. Its power sensitivity is low, with less than a 2mV change in output voltage per volt change in input voltage, ensuring stable performance despite minor power fluctuations. It provides dual output signals: a standard 4-20mA DC current output for easy integration with common monitoring systems and a voltage output following the 3.94V/mm scale factor. The output resistance is 50Ω, and the recommended field wiring is 0.2 to 1.5mm² (16 to 24 AWG) three-conductor shielded triad cable, with a maximum allowable length of 305 meters to avoid signal degradation.
Environmental Adaptability
The Bently Nevada 330780-50-00 is engineered to withstand harsh industrial conditions. Its operating temperature range is -52°C to +100°C (-62°F to +212°F), and the storage temperature range is -52°C to +105°C (-62°F to +221°F), allowing use in both cold and high-temperature environments. When paired with compatible 3300 XL 11mm probes, the system can handle probe temperatures up to +177°C (+351°F), though exposing the probe to temperatures below -34°C (-30°F) may cause premature failure of the pressure seal.It holds an IP67 Protection Level (ingress protection), safeguarding against dust and water ingress, and features enhanced RFI/EMI (radio frequency interference/electromagnetic interference) immunity, meeting European CE mark requirements without special mounting considerations. This immunity prevents adverse effects from nearby high-frequency radio signals. The sensor can operate in 100% condensing humidity (when connectors are protected) and complies with IEC 68-2-3 damp heat testing standards. In 60Hz magnetic fields up to 300 Gauss (in a 5-meter system), output voltage fluctuations are minimal—ranging from 0.001mil pp/gauss (probe end) to 0.033mil pp/gauss (sensor end at 2.5mm gap)—ensuring data integrity in magnetic environments.
Product Features and Advantages
One of the standout features of the Bently Nevada 330780-50-00 is its non-contacting measurement design, which eliminates mechanical wear between the sensor and target components (e.g., shafts). This not only extends the lifespan of both the sensor and the equipment being monitored but also reduces maintenance costs and downtime associated with component replacement.
High interchangeability is another key benefit: all 3300 XL 11mm series components (probes, extension cables, Proximitor Sensors) are fully interchangeable, meaning users do not need to perform individual matching or bench calibration when replacing parts.
This simplifies inventory management and speeds up maintenance processes.The sensor’s wide temperature tolerance—operating from -52°C to +100°C—makes it suitable for extreme industrial environments, from cold storage facilities to high-temperature steam turbines. Its enhanced RFI/EMI immunity ensures stable performance even in areas with high electromagnetic activity, such as near heavy machinery or radio transmitters, preventing data corruption and ensuring reliable monitoring.
Installation flexibility is also a strong point: while the 330780-50-00 is configured for panel mount, the broader 3300 XL Proximitor Sensor line supports high-density DIN-rail installation or traditional panel mount setups. The SpringLoc terminal strips on the sensor require no special installation tools, enabling faster and more robust field wiring connections, which reduces installation time and labor costs.
For harsh environments, optional features like FluidLoc cables and armor protection provide added durability: FluidLoc cables prevent oil and liquid leakage through the cable interior, critical for applications like turbine monitoring, while armored cables resist physical damage from impact or abrasion. Connector protectors further enhance environmental resilience, making the sensor suitable for humid, dusty, or corrosive conditions.
Application Scenarios
The Bently Nevada 330780-50-00 is widely used in industrial settings where precise, non-contacting condition monitoring is essential. In fluid film bearing machines—such as steam turbines and generators in power plants—it measures radial vibration and axial position, helping detect issues like shaft misalignment or bearing wear early, before they lead to catastrophic failure.In reciprocating compressors, common in oil and gas processing, the sensor monitors rod position and rod drop, providing insights into compressor performance and identifying potential issues with piston rods or cylinders. For rotating machinery like pumps and motors, it captures tachometer data (including zero speed measurements) and Keyphasor signals, which are critical for analyzing rotational speed, phase relationships, and rotor dynamics—key for predictive maintenance and fault diagnosis.
The sensor’s compliance with hazardous area certifications (cNRTLus, ATEX/IECEx) and wide temperature range makes it suitable for extreme environments, including offshore oil platforms, maritime vessels, and chemical plants. In these settings, it operates safely in potentially explosive atmospheres or harsh weather conditions, ensuring continuous monitoring of critical equipment.
Additionally, its compatibility with API 670 standards makes it a preferred choice for the oil and gas industry, where adherence to strict safety and performance guidelines is mandatory. Whether used in power generation, oil and gas, manufacturing, or maritime sectors, the sensor plays a vital role in improving equipment reliability, reducing downtime, and lowering maintenance costs through predictive monitoring.
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