Product Overview
The Bently Nevada 330903-00-03-50-02-05 is a 3300 NSv proximity probe engineered for precise vibration and position monitoring in critical rotating machinery. This Industrial Automation Module features an M8x1 threaded case, a 5.0-meter (16.4 feet) total length, and a miniature coaxial ClickLoc connector with standard cable. It carries multiple agency approvals (option 05) and is supplied new and original in factory packing with a 12-month warranty.
As a direct replacement for the legacy 3300 RAM probe, the 330903-00-03-50-02-05 offers enhanced chemical resistance, making it ideal for process compressor applications. Its side-view characteristics outperform the 3000-series 190 probe, ensuring accurate gap measurements even in tight installations.
Key Technical Specifications
The Bently Nevada 330903-00-03-50-02-05 delivers reliable performance across demanding environments. Below are the critical parameters:
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Probe DC Resistance: 5.3 ± 0.7 ohms (at 5.0 m length)
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Linear Range: 1.5 mm (60 mils), starting at 0.25 mm (10 mils) from target
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Recommended Gap Setting: 1.0 mm (40 mils)
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Incremental Scale Factor (ISF): 7.87 V/mm (200 mV/mil) with +12.5%/-20% interchangeability error
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Deviation from Best Fit Straight Line (DSL): Less than ±0.06 mm (±2.3 mils)
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Frequency Response: 0 to 10 kHz: +0, -3 dB typical with up to 305 m (1000 ft) of field wiring
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Operating Temperature: -52°C to +177°C (-62°F to +351°F)
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Probe Case Material: AISI 304 stainless steel
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Probe Tip Material: Polyphenylene sulfide (PPS)
Performance and Reliability
With an extended linear range and high accuracy, the 330903-00-03-50-02-05 ensures dependable vibration monitoring. The probe's robust construction—stainless steel case and PPS tip—provides durability in harsh industrial settings. The 75-ohm coaxial cable with FEP insulation maintains signal integrity over long runs.
Field wiring may extend up to 305 meters (1,000 feet) between the Proximitor Sensor and monitor, using three-conductor shielded triad cable (0.2 to 1.5 mm² / 16 to 24 AWG). This flexibility simplifies installation in large plants.
Applications
The Bently Nevada 330903-00-03-50-02-05 is designed for:
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Process Compressors: Chemical resistance enables reliable operation in aggressive media.
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Turbomachinery: Accurate shaft vibration and position monitoring for turbines and generators.
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Pumps and Motors: Early detection of mechanical faults to prevent unplanned downtime.
Its high temperature tolerance and pressure-sealed design (Viton O-ring) make it suitable for demanding rotating equipment.
Installation and Setup
Proper installation is crucial for optimal performance. Mount the probe with finger tight torque initially, then apply a maximum torque of 0.56 N•m (5 in•lb). For M8x1 threads, the maximum recommended torque is 7.3 N•m (65 in•lb) rated, with 5.1 N•m (45 in•lb) recommended. Ensure thread engagement does not exceed 12 mm.
Maintain a minimum bend radius of 25.4 mm (1.0 in) for the probe cable to avoid damage. When routing field wiring, follow the frequency response graphs (Figures 16 and 17) to account for signal rolloff at high frequencies over long distances.
Compatibility and Integration
The 330903-00-03-50-02-05 is mechanically and electrically interchangeable with Bently Nevada's previous 3300 RAM probe and extension cable. It works seamlessly with 3300 XL NSv Proximitor Sensors and compatible monitoring systems. The miniature coaxial ClickLoc connector ensures secure, quick connections.
Maintenance and Longevity
Routine inspection of the probe tip and cable is recommended to ensure accurate readings. The stainless steel case resists corrosion, and the PPS tip withstands chemical exposure. Operating within the specified temperature range (-52°C to +177°C) extends service life. Avoid exceeding the maximum torque to prevent thread damage.
Buying Guide
When ordering the Bently Nevada 330903-00-03-50-02-05, verify the total length (5.0 m), connector type (miniature coaxial ClickLoc), and agency approvals (multiple). This part is new and original in factory packing, backed by a 12-month warranty. For bulk or custom requirements, PLC Source PRO offers reliable sourcing and competitive pricing.