Bently Nevada 330195-02-12-10-CN 3300 XL 8 mm ETR Reverse Mount Probe

Configured for high-temperature shaft position and vibration sensing, the Bently Nevada 330195-02-12-10-CN (330195 ETR Proximity Probe) provides direct physical execution of non-contact displacement measurement. This probe is engineered for reverse-mount applications within the 3300 XL platform, converting radial or axial shaft movement into proportional voltage signals.

Suffix Breakdown & Model Matrix

Hardware Specifications

Eddy-Current Probe Scaling and Gap Voltage Validation

The 330195 probe is optimized for performance in high-temperature environments while maintaining the standard 7.87 V/mm (200 mV/mil) scale factor. During installation, verify the gap voltage at the Proximitor sensor output with a target of -10 VDC at the linear center of the probe range. To ensure measurement accuracy, perform gap voltage validation under thermally stable conditions, as extreme temperatures can influence probe tip resonance and target material properties. Effective cross-talk suppression requires that coaxial leads remain within grounded metallic conduit to prevent the induction of electromagnetic noise from surrounding plant equipment.

Frequently Asked Questions

Q: Can the 330195 ETR probe be paired with a standard (non-ETR) extension cable?

A: No. System calibration assumes matched impedance and dielectric properties across the entire probe, extension cable, and Proximitor sensor loop. Mixing ETR and non-ETR components will invalidate the linear scale factor.

Q: What is the primary advantage of the reverse mount configuration?

A: The reverse mount design allows the probe to be mounted through a bracket inside a bearing housing or case, directing the tip toward the shaft from an internal orientation, which is necessary where external mounting access is restricted.

Field Installation Guidelines

• Probe Mounting: Ensure the probe is mounted perpendicular to the target shaft. Avoid excessive torque on the probe body during mounting to prevent thread fatigue or tip damage.
• Shielding: Maintain shield continuity. Ground the signal shield at the Proximitor end only to avoid ground loop currents that inject noise into the low-level signal loop.
• Cable Handling: Adhere to the minimum bend radius of 25.4 mm (1.0 inch). Do not subject the coaxial cable to tension during installation; use proper conduit or cable supports to protect the cable jacket.
• Connector Integrity: Use the appropriate connector protectors if the environment is prone to conductive dust or moisture. Ensure the connection is fully seated to prevent intermittent signal dropout.