Configured for non-contacting vibration and position monitoring in rotating machinery, the Bently Nevada 330905-00-13-05-02-00 (330905 3300 NSv Proximity Probe) provides direct physical displacement measurement via an eddy-current transduction circuit. This transducer system converts the distance between the probe tip and a metallic target into a proportional electrical signal for integration with monitoring platforms.

Model Configuration Matrix

The 330905-00-13-05-02-00 is a modular component defined by the following configuration:

• 00: Total probe length (0.5 m)

• 13: Probe mounting thread (3/8-24 UNF)

• 05: Unthreaded length option (50 mm)

• 02: Total probe length (0.5 m)

• 00: Connector and cable options (Standard)

Technical Specifications

Eddy-Current Probe Signal Dynamics

The 330905 NSv system utilizes high-frequency radio waves to establish an electromagnetic field at the probe tip. When a conductive material (target) enters this field, eddy currents are induced, causing a change in the field impedance. The internal circuitry demodulates this change into a linear voltage output. Maintenance personnel must verify the "Gap Voltage," targeting approximately -10 VDC when the probe is centered in its linear range relative to the shaft. Failure to maintain the correct gap causes signal clipping or non-linear output, which directly impacts the accuracy of rotor dynamics analysis, including orbits and shaft centerline plots.

Ordering & Included Components

• 330905-00-13-05-02-00 Proximity Probe

• Calibration certificate detailing sensitivity and scale factor

• Protective connector caps

• Installation instruction manual (Technical documentation pack)

Mechanical Installation Procedures

• Ensure the mounting bracket provides sufficient rigidity to prevent mechanical resonance at or near the 1X or 2X running speed of the machine.

• Verify the target material is non-magnetic to avoid sensitivity deviations; if using stainless steel, apply manufacturer-provided correction factors.

• Maintain a minimum distance of 3 diameters from the probe tip to any surrounding metallic objects (side view clearance) to prevent interference with the electromagnetic field.

• Torque the jam nuts securely against the mounting bracket to lock the probe in position after setting the gap voltage.

Logistics and Handling

• Delivery time: 2-7 days when payment finish.

• Dispatched via DHL, FEDEX, or UPS.

• Components are sealed in anti-static industrial packaging to prevent electrostatic discharge (ESD) and mechanical damage during transit.

Frequently Asked Questions

• What material targets are supported? The probe is calibrated for AISI 4140 steel. Other conductive materials will change the scale factor, requiring specific calibration curves to ensure output accuracy.

• What is the probe sensitivity? The 3300 NSv system is typically calibrated to a sensitivity of 8 mV/µm (200 mV/mil).

• How often should calibration be verified? Annual verification is recommended. If the system is used in a critical safety loop, verification should align with the facility's preventive maintenance interval for TSI.

• Can the probe operate in hazardous environments? Yes, when installed with approved intrinsic safety barriers and appropriate control drawing requirements for the specific zone classification.

• What extension cables are compatible? Only Bently Nevada 3300 NSv series extension cables should be used to ensure total system length (TSL) impedance matching.

• What causes unstable gap voltage? Unstable readings are typically caused by loose mounting brackets, electrical noise (EMI) from improper shielding, or surface defects on the target shaft.

• How is probe health tested? Probe health is validated using a static gap voltage test and a dynamic test using a calibrated target disk to verify the linear signal response.

• What is the expected service life? Service life is dependent on mechanical vibration levels and operating temperature; however, under standard industrial conditions, the probe is designed for long-term continuous duty.