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Configured for non-contacting displacement and vibration measurements in 3300 XL Proximity Transducer System networks, the Bently Nevada 330105-02-12-05-02-00 (330105 Reverse Mount Probe) provides direct physical/electrical execution.

Suffix Breakdown & Model Matrix

  • 330105: Base model number for 3300 XL 8 mm reverse mount proximity probe.
  • -02: Unthreaded Length Option (02 = 20 mm).
  • -12: Overall Case Length Option (12 = 120 mm).
  • -05: Total Length Option (05 = 0.5 metre / 1.6 feet).
  • -02: Connector Option (02 = Miniature ClickLoc coaxial connector).
  • -00: Agency Approval Option (00 = Not required).

Hardware Specifications

Parameter Specification
Model 330104-12-20-10-02-00 (Input base matched to 330105-02-12-05-02-00 configuration)
Brand Bently Nevada
Origin U.S.A.
Weight 0.323 kg
Dimensions 8 mm probe tip diameter, 120 mm overall case length, 0.5 metre total cable length
Operating Temp -51 deg C to +177 deg C nominal
Power Consumption Driven via external Proximitor Sensor loop connection
Probe Tip Material Polyphenylene Sulfide (PPS)
Probe Case Material AISI 303 or 304 Stainless Steel (SST)
Connector Type Miniature ClickLoc coaxial connector
Linear Range 2.0 mm (80 mils) nominal when paired with standard target

Eddy-Current Probe Scaling and Gap Voltage Validation

The 330105-02-12-05-02-00 assembly applies an alternative housing interface for reverse-mount positions where a rear entry sleeve secures the element inside the machine shell. The 8 mm PPS tip generates an RF field to achieve eddy-current probe scaling over a 2.0 mm linear range. Operational accuracy depends on gap voltage validation during local mechanical installation. Field personnel must adjust the threaded mounting sleeve depth until the static output across the matching Proximitor reads the defined -10 VDC targets. This alignment registers the target surface inside the optimal sector of the scale factor loop, ensuring precise capture of rotor dynamics while maintaining cross-talk suppression against adjacent radial or axial transducers inside the same bearing housing.

Frequently Asked Questions

Q: How does the short 0.5 metre total probe length affect matching extension cables and Proximitor tuning?

A: The proximity transducer system requires a fixed electrical length of either 5.0 metres or 9.0 metres. A 0.5 metre probe must be paired exclusively with a matching extension cable (such as a 4.5 metre or 8.5 metre model) to satisfy total network impedance and prevent errors in eddy-current probe scaling.

Q: What are the consequences of letting fluid contaminants access the ClickLoc coaxial connector?

A: Moisture or oil ingress at the coaxial junction degrades the insulation resistance of the 75 Ohm line. This causes drift during gap voltage validation and distorts higher frequency components critical for assessing complex rotor dynamics.

Field Installation Guidelines

  1. Reverse Housing Mechanical Fit: Install the probe through the rear entry bore or housing block. Thread the casing into position by hand to prevent thread binding on the AISI 303/304 stainless steel barrel.
  2. Static Gap Verification: Connect the 0.5 metre lead to the matched extension cable linked to an active Proximitor Sensor. Read the output with a voltmeter and advance the probe body into the mount until the loop reports exactly -10 VDC.
  3. Locknut Mechanical Anchoring: Tighten the rear locking sleeve or nut to preserve position against structural vibration. Keep the voltmeter monitored during this step to verify that the tightening torque does not shift the probe head away from its target baseline.
  4. Coaxial Routing and Ground Isolation: Route the flexible lead through oil-resistant conduit. Ensure the cable maintains a static bend radius greater than 25.4 mm, and secure the ClickLoc connection within an insulated terminal box to prevent grounding against the machine frame.

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