Description

The Bently Nevada 330850-50-CN, also cataloged as the 330850 Proximitor Sensor, operates as a dedicated hardware component for eddy-current signal conditioning and displacement measurement within 3300 XL 25 mm proximity transducer systems.

Suffix Breakdown & Model Matrix

• 330850: 3300 XL 25 mm Proximitor Sensor
• 50: 5.0 meters (16.4 feet) system length, panel mount
• CN: China-specific agency approvals

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 12.7 mm linear range (which begins at 0.63 mm and extends to 13.33 mm from the target). 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 0.787 V/mm scale factor.

Frequently Asked Questions

Q: Can a 330850-50-CN Proximitor sensor operate with a 5.0 m system length probe and extension cable?

A: Yes. Specifically, the “50” 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.