Introduction
The Bently Nevada 330195-02-12-50-05 is a 3300 XL 8 mm Extended Temperature Range (ETR) Reverse Mount Probe designed for rotating machinery applications where conventional front-mounted probe installation is difficult or unavailable.
This configuration uses a 3/8-24 UNF thread, a 12 mm unthreaded length, and a 5.0 m (16.4 ft) total probe length. The final -05 configuration provides CSA, ATEX, and IECEx approvals. The 330195 family is specifically identified for 3300 XL 8 mm ETR reverse-mount applications.
The 5-meter configuration is especially valuable for installations where the monitoring electronics are positioned some distance from the machine. When correctly paired with the corresponding 3300 XL Proximitor Sensor and system components, it provides a practical solution for continuous shaft vibration and position monitoring.
Technical Specifications
The 330195-02-12-50-05 combines the reverse-mount mechanical configuration of the 330195 series with the 5.0 m total-length option and multiple-approval configuration. The 3300 XL documentation lists 5.0 m as an available total-length option for the ETR reverse-mount probe family.
| Specification | 330195-02-12-50-05 |
|---|
| Manufacturer | Bently Nevada |
| Product Family | 3300 XL |
| Product Type | 8 mm ETR Reverse Mount Probe |
| Model Number | 330195-02-12-50-05 |
| Probe Series | 330195 |
| Mounting Style | Reverse Mount |
| Thread | 3/8-24 UNF |
| Unthreaded Length | 12 mm |
| Total Probe Length | 5.0 m (16.4 ft) |
| Probe Tip Diameter | 8.0 mm (0.31 in) |
| Sensitivity | 7.87 V/mm (200 mV/mil) |
| Linear Range | 2.0 mm (80 mils) |
| Linear Range Start | Approx. 0.25 mm (10 mils) from probe tip |
| Cable Type | 75 Ω triaxial ETR cable |
| Cable Diameter | Approx. 2.54 mm (0.100 in) |
| Minimum Cable Bend Radius | 25.4 mm (1.0 in) |
| Probe DC Resistance | Approx. 5.0–11.0 Ω |
| Extension Cable Impedance | 75 Ω nominal |
| System Input Voltage | -24 Vdc nominal |
| Maximum Tightening Torque | 13.6 N·m (120 in-lbf) |
| Agency Approval | CSA, ATEX, IECEx |
| Typical Application | Shaft vibration and position monitoring |
Applications
The 330195-02-12-50-05 is intended for non-contact measurement of rotating machinery targets, particularly in installations where the probe must be reverse mounted and the monitoring electronics are located several meters away.
The eddy-current sensing principle allows the system to monitor changes in the distance between the probe tip and a conductive shaft or target. This supports both static position measurements and dynamic vibration measurements.
Typical applications include:
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Steam turbine shaft vibration monitoring
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Gas turbine machinery protection
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Centrifugal compressor monitoring
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Generator rotor monitoring
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Large pump monitoring
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Motor shaft measurement
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Fluid-film bearing monitoring
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Radial shaft vibration measurement
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Axial shaft-position measurement
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Keyphasor reference applications
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Rotational speed measurement
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Critical machinery protection
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Industrial condition-monitoring systems
The 5-meter length is particularly useful when the Proximitor Sensor needs to be installed in a remote instrumentation cabinet or machinery-monitoring area.
For critical machinery, the complete probe, cable, and Proximitor Sensor configuration should be selected as a system. The 3300 XL architecture is designed around compatible system components rather than treating the probe as an independent displacement sensor.
Advantages
Long 5-Meter Reach
The most notable feature of this configuration is the 5.0 m total length. It gives installation teams considerably more routing flexibility than 0.5 m, 1.0 m, or 1.5 m versions.
Reverse-Mount Design
The reverse-mount construction allows the probe to be installed from the rear of the mounting arrangement. This can be a major advantage in turbine, compressor, and generator housings where direct front access is restricted.
3/8-24 UNF Thread
The 3/8-24 UNF mounting thread provides compatibility with the 330195 reverse-mount mechanical configuration and distinguishes this probe from the M10 x 1 330196 series.
8 mm Sensing Tip
The 8 mm sensing tip provides non-contact measurement of conductive targets and is suited to important machinery parameters such as shaft vibration and position.
Extended Temperature Range
The ETR construction is intended for demanding machinery environments where higher operating temperatures can be encountered. This makes the probe a strong option for applications around turbines, compressors, and other high-performance rotating equipment.
International Approvals
The -05 approval configuration provides CSA, ATEX, and IECEx approvals, supporting installations with international certification or hazardous-area requirements.
Compact Cable Diameter
Despite its 5-meter reach, the cable has an approximately 2.54 mm diameter, helping simplify routing through equipment areas where space is limited. Proper bend-radius control remains important during installation.
Reliable Mechanical Construction
The 3300 XL 8 mm family uses a robust probe design intended for industrial machinery monitoring. The 8 mm probe construction provides a stronger physical package than smaller 5 mm designs, making it well suited to demanding field environments.
Technical FAQs
1. What is the Bently Nevada 330195-02-12-50-05?
It is a 3300 XL 8 mm Extended Temperature Range Reverse Mount Probe with a 3/8-24 UNF thread, 12 mm unthreaded length, 5.0 m total length, and CSA, ATEX, and IECEx approvals.
2. What does the 50 in the part number mean?
The 50 identifies the 5.0 m (16.4 ft) total probe length.
3. What does the 05 at the end mean?
The final 05 identifies the multiple-agency approval configuration, including CSA, ATEX, and IECEx approvals.
4. What thread does the probe use?
The 330195-02-12-50-05 uses a 3/8-24 UNF thread. The M10 x 1 reverse-mount equivalent belongs to the 330196 family.
5. Is this a forward-mount or reverse-mount probe?
It is a reverse-mount probe. The 330195 family is specifically designated for 3300 XL 8 mm ETR reverse-mount applications.
6. What is the probe-tip diameter?
The sensing tip is 8.0 mm (0.31 in) in diameter.
7. What is the sensitivity?
The nominal system sensitivity is 7.87 V/mm (200 mV/mil). The specified linear range is 2.0 mm (80 mils).
8. What is the cable diameter?
The cable diameter is approximately 2.54 mm (0.100 in), with a minimum recommended bend radius of 25.4 mm (1.0 in).
9. Is the 5-meter probe interchangeable with shorter versions?
The physical probe family may share common characteristics, but the total system length and associated Proximitor Sensor configuration are important. The 3300 XL documentation specifically notes that 5-meter probes are designed for use with the 5-meter Proximitor Sensor.
10. What should be verified before ordering a replacement?
Check the reverse-mount configuration, 3/8-24 UNF thread, 12 mm unthreaded length, 5.0 m total length, ETR cable construction, approval code, connector arrangement, and compatible Proximitor Sensor. Matching only the 8 mm probe diameter is not enough to establish a correct replacement.
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