Description

The Bently Nevada 330780-51-05, also cataloged as the 330780 Proximitor Sensor, serves as the primary 3300 XL 11 mm Proximitor Sensor utilized to execute non-contacting vibration and displacement measurements across machinery protection platforms.

Suffix Breakdown & Model Matrix

• 330780: 3300 XL 11 mm Proximitor Sensor
• 51: 5.0 meters (16.4 feet) system length, 35 mm DIN-rail mount
• 05: Multiple international agency approvals (ATEX, CSA, IECEx)

Hardware Specifications

Eddy-Current Probe Scaling and Gap Voltage Validation

Consequently, the internal circuitry generates a high-frequency RF signal to establish an electromagnetic field at the probe tip, thereby driving non-contact shaft displacement measurements. To ensure accurate calibration, the installation technician must execute a gap voltage validation. Specifically, this procedure targets a nominal -10 VDC output at the physical center of the 4.0 mm linear range. Furthermore, the factory calibrates the conversion of the eddy-current field variation against an AISI 4140 steel target. As a result, any deviation in target metallurgy or improper probe-to-sensor system length scaling directly degrades the accuracy of the 3.94 V/mm scale factor.

Frequently Asked Questions

Q: Can a 330780-51-05 Proximitor sensor operate with a 5.0 m system length probe and extension cable?

A: Yes. Specifically, the “51” suffix indicates that the manufacturer calibrated the sensor for a 5.0 m total system length. Therefore, the technician must match the combined electrical length of the proximity probe and extension cable to exactly 5.0 m.

Q: How does input supply voltage affect the operational limits?

A: The sensor requires a negative DC supply voltage from -17.5 VDC to -26 VDC. However, operating the unit at a supply voltage more positive than -23.5 VDC without barriers limits the linear range of the transducer system.

Field Installation Guidelines

• First, secure the coaxial connectors between the probe and the extension cable. Tighten them to a maximum torque of 0.565 N-m. Thereafter, apply connector silicone tape or heat-shrink tubing to isolate the connection from physical grounding and moisture ingress.
• Second, mount the Proximitor housing inside a grounded metal enclosure. This action ensures compliance with radio frequency interference (RFI) standards.
• Third, maintain a minimum physical bend radius of 25.4 mm for the field wiring and the triaxial cable. Consequently, this precaution prevents physical fatigue and shielding breakdown.
• Finally, connect field wiring using the SpringLoc terminal strips. Depress the orange lever with a standard screwdriver to insert the conductors directly, thus eliminating the need for specialized crimping tools.