Configured for non-contact shaft vibration and axial position measurement in 3500 Machinery Protection System platforms, the Bently Nevada 330105-02-12-90-12-00 (330105 Proximity Probe) provides direct physical execution.

Ordering Option Matrix & Option Codes

• 330105: 3300 XL 8 mm Proximity Probe, Reverse Mount, 3/8-24 UNF thread
• -02: Unthreaded Length Option (0.2 in)
• -12: Overall Case Length Option (1.2 in)
• -90: Total Length Option (9.0 m / 29.5 ft)
• -12: Connector and Cable Option (Miniature coaxial ClickLoc connector, fluid-resistant protective armor)
• -00: Agency Approval Option (No agency approvals required)

Physical and Electrical Parameters

Eddy-Current Probe Scaling & Target Calibration

The 330105 eddy-current probe operates on high-frequency electromagnetic field output to track rotor dynamics without physical contact. System calibration delivers a linear scale factor of 200 mV/mil (7.87 V/mm) when targeted against AISI 4140 steel. Proper mechanical installation requires verifying the gap voltage at the Proximitor Sensor output to target approximately -10 VDC during static baseline positioning. This offset ensures maximum linear dynamic range for cross-talk suppression and precise vibration amplitude acquisition across high-speed turbomachinery shafts.

Standard Delivery Contents

• 1 x Bently Nevada 330105-02-12-90-12-00 Reverse Mount Probe Assembly
• 1 x Integrated 9.0 m Armored Coaxial Cable with ClickLoc Connector
• 1 x Protective Connector Dust Cap

Mechanical Installation and Wiring Criteria

• Mounting Orientation and Alignment
  • Install the reverse mount probe housing into the designated internal machine bracket or sleeve.
  • Ensure smooth thread engagement without forcing to prevent binding or thread deformation.
• Gap Voltage Setting Procedure
  • Position probe tip relative to the shaft target area.
  • Monitor the direct current output voltage at the Proximitor Sensor terminals.
  • Adjust physical gap position until the digital multimeter reads -10.0 VDC nominal offset.
• Cable Routing and Shielding
  • Maintain clean cable runs away from high-voltage motor leads or variable frequency drive wiring.
  • Secure flexible armor along rigid machine structures using insulated clamp supports.
  • Do not ground the cable shield at the probe housing; maintain single-point shield termination at the monitor rack.

Technical Query Clarifications

• What is the primary function of the 330105-02-12-90-12-00 probe?

  It measures static shaft position and dynamic vibration on rotating machinery by generating an eddy-current field facing a conductive target surface.

• Why does this probe model feature a 9.0 m total cable length?

  The 9.0 m option allows direct connection from the machine interior to an external junction box without requiring an intermediate extension cable.

• What voltage output indicates a correct mechanical gap baseline?

  A reading of -10.0 VDC measured at the Proximitor Sensor output terminals indicates the probe is positioned in the center of its linear range.

• How does the armor option protect the probe assembly?

  The flexible stainless steel armor shields the internal coaxial cable from mechanical impact, hot synthetic lubricants, and abrasion inside the machine casing.

• Can the probe cable be cut or spliced to adjust length?

  No. Cutting or splicing alters total circuit capacitance and inductance, destroying the 200 mV/mil calibration accuracy of the sensor system.

• What thread size is used on this reverse mount housing?

  The probe body utilizes standard 3/8-24 UNF outer threads for reverse mounting applications.

• Is an additional extension cable required for this specific part configuration?

  No. The 9.0 m integrated cable connects directly to a matching 9.0 m Proximitor Sensor without extra cable interconnects.

• What is the temperature limit for the probe tip and cable assembly?

  The probe head and integrated armored cable withstand continuous operational temperatures ranging from -51 deg C to +177 deg C.