Description

Configured for contactless linear displacement measurements in 3500 Machinery Protection Systems, the Bently Nevada 330801-28-05-101-03-02 (330801 Proximity Probe) provides direct physical/electrical execution.

Hardware Specifications

Eddy-Current Probe Scaling and Gap Voltage Validation

The 330801-28-05-101-03-02 transducer relies on eddy-current probe scaling optimized for a standard 11 mm tip diameter. Proper physical calibration requires a mechanical gap adjustment to achieve a gap voltage validation target of -10 VDC at the linear midpoint when referencing an AISI 4140 steel target. This physical configuration tracks real-time rotor dynamics under high vibration profiles. The internal coaxial driver matching reduces high-frequency cross-talk suppression failures when the probe is installed near adjacent displacement or velocity sensors on the same machine casing.

Frequently Asked Questions

Q: What is the primary operational difference between this 11 mm probe and standard 8 mm probes regarding gap voltage validation?

A: The 11 mm probe extends the total linear measurement range to 4.0 mm (160 mils), maintaining a nominal sensitivity of 3.94 V/mm (100 mV/mil). While the midpoint gap voltage validation remains a target of -10 VDC, the physical installation gap is wider than that of an 8 mm probe to accommodate the expanded measurement envelope.

Q: Can the physical cable length of this probe be modified in the field via splicing?

A: No. Altering the physical length of the coaxial cable destroys the calibrated electrical inductance and capacitance metrics required by the Proximitor Sensor. Splicing causes impedance mismatches, introducing signal distortion and invalidating the eddy-current probe scaling factors.

Field Installation Guidelines

• Mechanical Threading and Torque Execution: Manually engage the 5/8-18 UNF threads into the mounting bracket to avoid cross-threading. Secure the locknut utilizing a calibrated torque wrench, ensuring the applied torque does not exceed 22.6 N-m (200 in-lb).
• Coaxial Routing Protection: Route the integral coaxial extension cable using a minimum bend radius of 30.0 mm. Use conduit or dedicated cable trays to prevent mechanical pinching, stretching, or cutting from sharp structural edges.
• Electrical Isolation and Grounding: Ensure the coaxial connector remains electrically isolated from the machinery chassis. Terminal junctions must be housed in a grounded environmental junction box, with the overall shield terminated strictly at the Proximitor Sensor framework.