Bently Nevada 330101-00-15-20-02-05 8mm Probe

Reliable Shaft Displacement Sensing for Critical Turbomachinery

The Bently Nevada 330101-00-15-20-02-05 forms part of the field-proven 3300 XL series and provides accurate relative vibration measurements for rotating equipment protection. This 8 mm probe system incorporates a tip diameter of 8.1 mm and a case diameter of 14.2 mm for secure mounting in standard holders. Its overall length extends to 80 mm, featuring a threaded section of 21.6 mm and an unthreaded portion of 30.5 mm. This sensor weighs approximately 90 grams and draws power from a standard -24 Vdc negative supply. The device delivers continuous displacement data for steam turbines, gas compressors, and large motor trains.

Performance Metrics and Thermal Tolerance

This proximity probe offers a linear measurement range from 0.25 mm to 2.03 mm with a sensitivity of 7.87 mV/µm. It responds to frequencies from 0 to 10 kHz, capturing both static gap voltages and dynamic vibration components. The probe tip endures temperatures between -35°C and +177°C, while the extension cable remains operational up to +260°C. Such broad thermal capability ensures stable performance across varying process conditions. The included 15.0 meter cable incorporates a polyurethane jacket that resists oils, coolants, and mechanical abrasion.

Detailed Technical Specifications

Parameter	Value
Tip Diameter	8.1 mm
Case Diameter	14.2 mm
Overall Length	80 mm
Threaded Length	21.6 mm
Unthreaded Length	30.5 mm
Weight	Approx. 90 g
Cable Length	15.0 m (with connectors)
Sensitivity	7.87 mV/µm
Linear Range	0.25 mm to 2.03 mm
Frequency Response	0 to 10 kHz
Tip Temperature Range	-35°C to +177°C
Cable Temperature Range	Up to +260°C
Supply Voltage	-24 Vdc
Target Material	AISI 4140 steel
Cable Jacket Material	Polyurethane

Components and Interconnection Details

This proximity probe system includes the probe body, a 15.0 meter extension cable, and two coaxial connectors for streamlined field installation. An integral connector at the probe end forms a sealed barrier against moisture and particulate ingress. The terminal block on the driver side accepts standard 22 AWG wires for power and signal routing. This system stores negligible internal energy, which supports intrinsic safety approvals for hazardous area deployment. Operators can interface this probe with the Bently Nevada 3300 XL Proximitor or the 3500 Monitoring System for complete signal conditioning.

Installation Procedures and Maintenance Recommendations

Installing this proximity probe requires only a 14 mm wrench and compatible mounting brackets for the threaded case. The threaded body allows fine gap adjustments using the supplied locking nut for precise positioning. Routine visual checks of the cable jacket and connector pins will preserve long-term measurement accuracy. This probe proves especially valuable in predictive maintenance programs where early anomaly detection reduces costly outages. For optimal performance, calibrate the system against AISI 4140 steel reference targets to align with factory settings. The extended 15.0 meter cable provides considerable flexibility for locating the proximitor away from the machine train.