Overview
Configured for non-contact shaft displacement and vibration measurement in the Bently Nevada 3300 XL proximity transducer system, the Bently Nevada 330105-20-12-10-02-00 (330105 3300 XL 8 mm Reverse Mount Proximity Probe) provides direct eddy-current measurement of conductive targets. The probe uses a reverse-mount mechanical arrangement for installation from inside the machine casing outward.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 330105-20-12-10-02-00 |
| Base Model | 330105 |
| Brand | Bently Nevada |
| Product Type | 3300 XL 8 mm Reverse Mount Proximity Probe |
| Probe Tip Diameter | 8.0 mm |
| Thread Size | 3/8-24 UNF-2A |
| Unthreaded Length | 0.2 in (5.1 mm) |
| Overall Case Length | 1.2 in (30.5 mm) |
| Total Cable Length | 1.0 m (3.3 ft) |
| Connector | Miniature coaxial ClickLoc connector |
| Cable Insulation | FEP |
| Measurement Range | 2.0 mm (80 mils) |
| Measurement Span | Approximately 0.25 to 2.3 mm (10 to 90 mils) from target |
| Incremental Scale Factor | 7.87 V/mm (200 mV/mil) nominal, +/- 5% |
| Frequency Response | 0 to 10 kHz (+0, -3 dB) with up to 305 m field wiring |
| Recommended Gap Setting | -9 VDC, approximately 1.27 mm (50 mils) |
| Probe Temperature Range | -52 deg C to +177 deg C |
| Probe Tip Material | Polyphenylene sulfide (PPS) |
| Probe Case Material | AISI 303/304 stainless steel |
| Minimum Flat Target Size | 15.2 mm (0.6 in) diameter |
| Recommended Minimum Shaft Diameter | 76.2 mm (3.0 in) for radial vibration measurement |
Eddy-Current Scaling and Gap Voltage
The 330105-20-12-10-02-00 uses an eddy-current measurement principle to convert the distance between the probe tip and a conductive shaft target into an electrical signal. The nominal incremental scale factor is 7.87 V/mm, or 200 mV/mil, with a stated tolerance of +/- 5%.
For radial vibration measurement, the specified gap setting is -9 VDC, corresponding to approximately 1.27 mm (50 mils) of target clearance. During commissioning, verify the actual gap voltage against the installed Proximitor Sensor and the applicable system calibration data.
The probe provides a 2.0 mm (80 mils) measurement range. Therefore, probe position, shaft geometry, target size, and system calibration must remain within the documented operating range.
Frequently Asked Questions
Q: What type of target does the probe measure?
A: The probe measures conductive targets without physical contact. The specified minimum flat target size is 15.2 mm (0.6 in) in diameter.
Q: What gap voltage should be used for radial vibration measurement?
A: The supplied data specifies -9 VDC, corresponding to approximately 1.27 mm (50 mils) of probe-to-target gap.
Q: What cable length does this configuration provide?
A: The configuration specifies 1.0 m (3.3 ft) of total cable length with a miniature coaxial ClickLoc connector and standard FEP-insulated cable.
Field Installation Guidelines
Install the reverse-mount probe according to the mechanical arrangement of the machine casing and maintain the specified 3/8-24 UNF-2A thread engagement.
Position the probe so that the sensing tip faces the conductive shaft target without physical contact. Confirm that the target geometry satisfies the specified minimum target size and shaft diameter requirements.
During electrical commissioning, verify the probe gap voltage at the connected Proximitor Sensor. Use the specified -9 VDC target for radial vibration measurement and confirm the resulting mechanical clearance.
Route the probe cable away from high-current power conductors and other sources of electrical interference. Avoid sharp bends, excessive mechanical tension, and abrasion at the cable exit and connector.
Maintain the specified probe temperature range of -52 deg C to +177 deg C. Verify the complete transducer chain, including the probe, extension cable where applicable, Proximitor Sensor, and monitoring input, before placing the measurement channel into service.
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