Introduction

Bently Nevada’s 330105-02-12-05-02-00 Reverse Mount Probe combines the proven reliability of the 3300 XL sensing platform with a mechanical design optimized for restricted-access installations. With its precise 8 mm sensing coil, strong vibration linearity, and robust construction, this probe provides clean, dependable data essential for diagnosing early mechanical issues. It is widely adopted in advanced machinery-protection programs where confidence in every vibration reading truly matters.

Technical Specifications

Parameter	Details
Model	330105-02-12-05-02-00
Series	3300 XL
Probe Type	8 mm Reverse Mount Eddy-Current Probe
Total Length	0.5 m
Weight	0.162 kg
Measurement Principle	Eddy-current displacement
Primary Use	Shaft vibration & position monitoring
System Compatibility	3300 XL Proximitor modules

Recommended Related Models

Model	Description
330105-02-12	Standard 3300 XL 8 mm probe variant
330105-02-05	Short-length probe for compact installations
330105-02-15	Extended cable version
330130-040-00	General-purpose 3300 XL proximity probe
330103-00-04	Alternative 8 mm probe design
330171-00-12	Extension cable for 3300 series
330180-51-00	High-temperature proximity probe
330185-01-00	Shaft monitoring probe for turbines
330196-XX-XX	Shielded cable set for noise-sensitive plants
330980-50-00	Specialized proximitor for OEM equipment

Popular Related Models

Model	Description
330104-00-04	Widely used probe for heavy rotating equipment
330107-00-10	High-sensitivity eddy-current probe
330103-00-07	Turbine-grade 8 mm probe
330130-065-00	Robust industrial probe
330180-90-00	High-temperature monitoring probe
330171-50-00	Common extension cable in 3300 systems
330185-02-12	General rotor-vibration probe
330178-00-05	OEM compressor monitoring probe
330190-08-10	Long-run extension cable
330130-00-05	Standard eddy-current vibration probe

Applications

The 330105-02-12-05-02-00 Reverse Mount Probe is tailored for applications where the probe must be installed from the back side of the machine casing, such as in confined bearing housings, compressor seals, or turbine pedestal assemblies where traditional forward mounting is not feasible. Its precise 8 mm sensing technology makes it ideal for monitoring shaft vibration, axial position, and rotor dynamic behavior across gas turbines, industrial fans, steam turbines, and high-performance compressors.

Advantages

Reverse-mount design enables placement in tight or obstructed machinery environments
High signal stability, even with short 0.5-meter routing lengths
Optimized 8 mm eddy-current sensing for clear, repeatable vibration and position feedback
Rugged construction for long-term operation under temperature, oil mist, and mechanical stress
Full compatibility with the 3300 XL measurement architecture, ensuring seamless system integration

FAQs

What sensing range does the 8 mm Reverse Mount Probe support?
It delivers the standard 3300 XL linear range of approximately 2 mm dynamic displacement.
Does the short 0.5-meter length affect calibration?
No—this probe is factory-matched to the 3300 XL proximitor and maintains correct scale output.
What type of target material ensures optimal accuracy?
Ferromagnetic shaft materials such as 4140 steel provide the best linearity and sensitivity.
How does reverse mounting influence the probe’s performance?
Reverse mounting does not reduce measurement quality as long as the probe-to-target gap is correctly adjusted.
What is the typical frequency response capability?
It supports high-frequency vibration signals up to several kilohertz, suitable for fast rotor dynamics.
Is this probe interchangeable with other 330105 variants?
Electrically yes, but mechanical installation dimensions vary and must be matched to the application.
How resistant is the probe to oil contamination?
The sealed construction and non-contact measurement principle allow stable performance in oily environments.
Does ambient temperature impact the output stability?
The 3300 XL series includes temperature-compensation methods that keep drift within tight tolerances.
Can this probe be used with non-Bently Nevada proximitor modules?
It is recommended only with the 3300 XL Proximitor to maintain exact system calibration.
What gap voltage behavior should be expected during installation?
The probe should produce a stable, monotonic gap voltage curve when approaching the shaft surface, confirming correct alignment.