330709-000-050-50-02-00 | Bently Nevada | 11 mm Proximity Probe

The Bently Nevada 330709-000-050-50-02-00, also cataloged as the 330709 11 mm Proximity Probe, operates as a dedicated hardware component for non-contact displacement measurement within TSI (Turbine Supervisory Instrumentation) networks.

Hardware Specifications

Mechanical Monitoring and TSI Characteristics

The 330709 probe utilizes eddy-current principle to detect shaft displacement. Accurate gap voltage validation is mandatory during commissioning, with a -10 VDC target representing the linear mid-range of the sensor characteristic curve. Proper calibration against a AISI 4140 steel target is required to ensure linear output of 7.87 V/mm (200 mV/mil). To maintain signal integrity and avoid cross-talk suppression issues, ensure the probe tip is installed in accordance with specified clearance requirements to prevent interference from adjacent metallic objects or other sensors.

Frequently Asked Questions

Q: Does the 330709 probe require a specific Proximitor sensor?

A: Yes, this 5 meter cable option requires a matching 5 meter calibration Proximitor sensor to maintain system impedance and signal linearity.

Q: Can the ClickLoc connector be exposed to high vibration environments without support?

A: It is recommended to secure the connector interface to prevent mechanical fatigue; however, the ClickLoc design provides robust mechanical locking compared to standard coaxial connectors.

Q: What are the consequences of exceeding the 24 mm maximum thread engagement?

A: Exceeding this limit may result in mechanical interference with the target or damage to the internal coil assembly, potentially compromising the frequency response of the probe.

Field Installation Guidelines

• Thread Engagement: Observe the maximum thread engagement limit of 24 mm to prevent internal sensing element strain.
• Cable Routing: Maintain a minimum cable bend radius of 25.4 mm. Avoid sharp bends that may compromise the FEP triaxial shielding and lead to induced noise in the gap voltage signal.
• Grounding: Ensure the probe body is electrically bonded to the machine case to maintain a common ground reference, minimizing electromagnetic interference.
• Target Alignment: Position the probe perpendicular to the target surface. The target diameter must be at least 30.5 mm to prevent edge effects from distorting the displacement output.
• Pressure Seal: When installing in pressurized environments, observe the pressure seal temperature limit of -34 deg C to maintain integrity of the sealing components.