Introduction
The Bently Nevada 330195-02-12-90-05 is a 3300 XL 8 mm Extended Temperature Range (ETR) Reverse Mount Probe developed for demanding rotating-machinery monitoring applications where installation access, cable distance, and operating temperature all need to be considered.
This configuration uses a 3/8-24 UNF thread, 12 mm unthreaded length, and a 9.0 m (29.5 ft) total probe length. The final -05 configuration corresponds to the multiple-approval option covering CSA, ATEX, and IECEx requirements. The 3300 XL specification identifies 9 m as an available total-length configuration for the 330195 reverse-mount family.
The major selling point of this model is its 9-meter reach. It is intended for machinery installations where the monitoring electronics are located well away from the probe location. Combined with the reverse-mount design and ETR construction, this configuration offers substantial installation flexibility for turbines, compressors, generators, pumps, and other critical rotating equipment.
Technical Specifications
The 330195-02-12-90-05 belongs to the 3300 XL 8 mm ETR reverse-mount family. The 330195 designation identifies the 3/8-24 UNF reverse-mount probe, while 02-12 defines its mechanical configuration. The 90 represents the 9.0 m total length, and 05 specifies the multiple-approval configuration.
| Specification | 330195-02-12-90-05 |
|---|
| Manufacturer | Bently Nevada |
| Product Family | 3300 XL |
| Product Type | 8 mm ETR Reverse Mount Probe |
| Model Number | 330195-02-12-90-05 |
| Probe Series | 330195 |
| Mounting Style | Reverse Mount |
| Thread | 3/8-24 UNF |
| Unthreaded Length | 12 mm |
| Total Probe Length | 9.0 m (29.5 ft) |
| Probe Tip Diameter | 8.0 mm (0.31 in) |
| 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) |
| Nominal 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 |
| Probe Tip Material | Polyphenylene sulfide (PPS) |
| Probe Case Material | AISI 303/304 stainless steel |
| Agency Approval | CSA, ATEX, IECEx |
| System Type | 3300 XL 8 mm Proximity Transducer System |
Applications
The 330195-02-12-90-05 is intended for non-contact measurement of conductive rotating machinery targets. Its reverse-mount configuration is particularly useful when the probe must be installed from the rear of a mounting arrangement.
The 9-meter length expands the installation possibilities considerably. It can be useful when the machine is physically separated from the instrumentation cabinet or when the associated monitoring electronics need to be installed in a more accessible location.
Typical applications include:
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Steam turbine shaft vibration monitoring
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Gas turbine machinery protection
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Large compressor monitoring
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Generator shaft-position measurement
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Centrifugal pump monitoring
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Motor and rotating-equipment monitoring
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Fluid-film bearing applications
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Radial shaft vibration measurement
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Axial shaft-position measurement
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Keyphasor-related applications
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Rotational speed measurement
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Critical machinery protection
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Industrial condition monitoring
The 3300 XL 8 mm system measures the distance between the probe tip and a conductive target without requiring physical contact. This makes it suitable for monitoring shaft movement under normal operating conditions.
For installations involving a 9 m probe, particular attention should be paid to the complete system configuration. Probe, extension cable, and Proximitor Sensor characteristics should be matched rather than selected independently.
Advantages
9-Meter Installation Reach
The 9.0 m total length is the defining advantage of this model. It provides substantially greater routing flexibility than 0.5 m, 1 m, 1.5 m, 2 m, or 5 m configurations.
This makes the probe attractive when monitoring cabinets or Proximitor electronics are positioned farther away from the machinery.
Reverse-Mount Architecture
The reverse-mount design allows installation from the rear side of the mounting arrangement. This can simplify probe installation in machinery where conventional front access is obstructed.
3/8-24 UNF Thread
The 3/8-24 UNF thread provides a familiar imperial mounting configuration for the 330195 family and distinguishes this model from the metric M10 x 1 330196 reverse-mount family.
Extended Temperature Range
The ETR design is intended for demanding environments in which the probe lead and connector may experience higher temperatures than standard configurations can accommodate.
The ETR cable is rated for significantly higher temperature exposure than standard cable construction, making the configuration well suited to many turbine and compressor installations.
8 mm Sensing Technology
The 8 mm probe tip provides a robust sensing package for non-contact measurement of conductive targets. The larger probe construction is also advantageous where additional mechanical robustness is desirable.
International Approval Configuration
The -05 approval option provides CSA, ATEX, and IECEx approvals, making the model suitable for applications where recognized hazardous-area or international certification requirements are part of the equipment specification.
Compact Cable Diameter
Although the probe provides 9 meters of reach, the ETR cable maintains a relatively compact profile. This can simplify routing through machinery areas and instrumentation pathways.
Strong Solution for Remote Instrumentation
When a monitoring cabinet is positioned well away from the machine, a longer probe configuration can reduce the need for additional field connections. The 9 m version therefore offers an attractive solution for installations where distance is a key design consideration.
Technical FAQs
1. What is the Bently Nevada 330195-02-12-90-05?
It is a 3300 XL 8 mm ETR Reverse Mount Proximity Probe with a 3/8-24 UNF thread, 12 mm unthreaded length, 9.0 m total length, and multiple CSA, ATEX, and IECEx approvals.
2. What does “90” mean in the part number?
The 90 identifies the 9.0 m (29.5 ft) total probe length. The 3300 XL ordering information lists 90 as the 9 m total-length option.
3. Is this a reverse-mount probe?
Yes. The 330195 series is specifically used for 3300 XL 8 mm ETR reverse-mount probes with 3/8-24 UNF threads.
4. What thread does this probe use?
It uses a 3/8-24 UNF thread. The M10 x 1 equivalent belongs to the 330196 reverse-mount family.
5. What is the probe-tip diameter?
The sensing tip has a nominal diameter of 8.0 mm (0.31 in).
6. What is the sensitivity of the 3300 XL 8 mm system?
The nominal sensitivity is 7.87 V/mm (200 mV/mil), with a specified linear range of approximately 2.0 mm (80 mils) when the complete system is correctly configured.
7. What is the cable diameter?
The ETR cable is approximately 2.54 mm (0.100 in) in diameter, with a minimum recommended bend radius of approximately 25.4 mm (1.0 in).
8. What approvals does the -05 configuration provide?
The -05 agency option corresponds to CSA, ATEX, and IECEx approvals.
9. Is the 9-meter probe interchangeable with a 5-meter version?
It should not automatically be considered interchangeable. Total system length and compatible Proximitor Sensor configuration must be verified before replacement. The 3300 XL documentation specifically identifies system-length requirements for longer probe configurations.
10. What should be checked before ordering this probe?
Verify the reverse-mount arrangement, 3/8-24 UNF thread, 12 mm unthreaded length, 9.0 m total length, ETR cable, agency approval option, connector configuration, and compatible Proximitor Sensor. The 8 mm tip diameter alone is not sufficient for determining replacement compatibility.
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