330104-12-20-10-02-00 | Bently Nevada | 3300 XL 8 mm Proximity Probes

Configured for non-contacting vibration and displacement measurement in rotating machinery monitoring systems, the Bently Nevada 330104-12-20-10-02-00 (330104 Proximity Probe) provides direct physical/electrical execution. It operates by generating a high-frequency electromagnetic field that interacts with the target rotor shaft, translating physical gap variations into dynamic electrical signals when paired with a compatible 3300 XL Proximitor Sensor.

Suffix Breakdown & Model Matrix

The complete model number is constructed via specific functional options defined by the manufacturer:

• 330104: Base model identifier for 3300 XL 8 mm Proximity Probe with M10 x 1 threadless case type.

• 12: Specifies an unthreaded length of 120 mm.

• 20: Specifies an overall case length of 200 mm.

• 10: Indicates a total cable length of 1.0 metre (3.3 feet).

• 02: Equipped with a miniature coaxial ClickLoc connector and standard cable.

• 00: Agency approval option not required.

Hardware Specifications

Eddy-Current Probe Scaling & Rotor Dynamics

The Bently Nevada 330104-12-20-10-02-00 relies on precise eddy-current probe scaling to convert target distance into linear voltage outputs, typically calibrated at a standard scale factor of 7.87 V/mm (200 mV/mil). During installation, gap voltage validation is required to establish the static operational equilibrium point; positioning the probe tip to achieve a -10 VDC target voltage ensures the sensor operates within its optimal linear range. This electrical configuration enables high-fidelity capturing of rotor dynamics, resolving micro-inch variations in shaft displacement without mechanical contact. Additionally, advanced physical shielding within the standard cable integration provides cross-talk suppression, preventing adjacent high-frequency proximity channels from cross-modulating the sensor loop signals when multiple units are deployed within the same bearing housing.

Frequently Asked Questions

Q: What is the mechanical function of the Viton O-ring within this probe assembly?

A: The Viton O-ring functions exclusively as a static barrier intended to seal differential pressure between the polyphenylene sulfide (PPS) probe tip and the stainless steel case. However, these standard units are not pressure tested prior to shipment; applications requiring verified pressure boundaries must be specified for custom laboratory testing.

Q: Can the 1.0-metre cable of the 330104 probe be coupled directly to an acquisition system?

A: No, the probe cable cannot be routed directly to a monitoring system. The miniature coaxial ClickLoc connector must interface with a matching extension cable to form a total system length of either 5.0 metres or 9.0 metres, terminates at a 3300 XL Proximitor Sensor.

Field Installation Guidelines

• Mechanical Thread Engagement and Torque: Ensure threadless cases are rigidly clamped to prevent mechanical shifting under high vibration. For threaded sections or mounting brackets, maintain consistent thread engagement to prevent damage to the AISI 303/304 stainless steel housing.

• Gap Voltage Tuning: Before tightening the mounting hardware, verify the DC gap voltage using a digital multimeter at the Proximitor terminal layer. Adjust the physical position of the probe tip relative to the target shaft until the gap voltage reads -10 VDC, corresponding to the center of the calibrated linear range.

• Coaxial Cable Protection: Do not exceed the minimum bend radius of 25.4 mm (1.0 inch) for the standard coaxial cable. Route all extension lines through dedicated, grounded metal conduit to prevent mechanical abrasion and to isolate the low-voltage signals from adjacent high-power plant wiring.

• ClickLoc Connector Handling: Clean all coaxial interfaces with a dry, lint-free cloth before joining. Engage the ClickLoc connector firmly until an audible click confirms positive mechanical lock. Insulation sleep or proper sealing tape must be applied if moisture intrusion is possible at the junction box point.