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Bently Nevada 330876-02-50-00-00 3300 XL 50 mm High-Temperature Proximity Probe

The Bently Nevada 330876-02-50-00-00, also cataloged as the 330876 3300 XL 50 mm High-Temperature Proximity Probe, operates as a dedicated hardware component for shaft displacement and vibration measurement within Bently Nevada TSI monitoring systems.

Hardware Specifications

Parameter	Specification
Model	330876-02-50-00-00
Brand	Bently Nevada
Product Type	3300 XL 50 mm High-Temperature Proximity Probe
System Type	Eddy Current Proximity Transducer
Origin	USA
Tip Diameter	50 mm
Linear Range	Up to 27.9 mm (1100 mils)
Scale Factor	394 mV/mm (10 mV/mil)
Target Material	AISI 4140 steel target, minimum target surface diameter 102 mm
Case Thread	M14 x 1.5 threaded case
Case Material	AISI 304 stainless steel
Tip Material	Polyphenylene sulfide (PPS)
Cable Type	High-Temperature FluidLoc cable
Cable Length	5.0 meters
Armor	Unarmored
Connector Type	Miniature coaxial ClickLoc connector
Operating Temp	-35 deg C to +200 deg C
Short-Term Temperature Limit	Up to +250 deg C for transient conditions less than 24 hours
Power Consumption	Supplied through compatible Bently Nevada proximity driver system; value not specified

Eddy-Current Measurement and Rotor Dynamics Characteristics

The 330876-02-50-00-00 uses an eddy-current sensing principle to generate proportional displacement signals from conductive targets. Therefore, the probe provides a 394 mV/mm scaling factor for shaft position and vibration measurement applications.

The 3300 XL 50 mm design supports differential expansion monitoring by measuring the relative movement between rotating components and stationary machine structures. In addition, the extended linear range allows the probe to monitor large mechanical displacement movements in turbine applications.

The probe system requires proper gap voltage validation during commissioning. Bently Nevada proximity systems typically verify probe operation through gap voltage targets around -10 VDC to confirm correct installation position and measurement range.

Furthermore, the probe construction supports rotor dynamics analysis by providing continuous displacement feedback for vibration evaluation, thrust position monitoring, and machine protection logic.

Frequently Asked Questions

Q: What measurement principle does the Bently Nevada 330876-02-50-00-00 use?
A: The probe uses an eddy-current sensing element to measure shaft displacement without mechanical contact between the probe tip and the monitored target.

Q: Can the 330876-02-50-00-00 operate in high-temperature environments?
A: Yes. The probe supports continuous operation from -35 deg C to +200 deg C and allows short-term exposure up to +250 deg C under transient conditions.

Q: What cable design is used on this proximity probe?
A: The probe uses a 5.0 meter unarmored High-Temperature FluidLoc cable, which limits oil and fluid migration through the cable structure.

Field Installation Guidelines

Install the probe with the specified M14 x 1.5 threaded case connection and maintain correct mechanical alignment with the monitored shaft target.

Before operation, verify the probe gap position using the compatible proximity system monitor. Confirm that the gap voltage remains within the expected operating range, including typical -10 VDC validation targets.

Route the FluidLoc cable away from high-current power conductors and strong electromagnetic interference sources. Use proper cable separation practices to reduce signal disturbance.

Connect the miniature coaxial ClickLoc connector securely and inspect the connection point for contamination, mechanical stress, or moisture exposure.

During commissioning, confirm target material compatibility, probe clearance, and signal scaling before enabling machine protection functions.

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