Introduction
The Bently Nevada 330195-02-12-05-05 is a 3300 XL 8 mm Extended Temperature Range (ETR) Reverse Mount Probe developed for machinery installations where a conventional forward-mounted proximity probe is difficult or impractical to install.
This configuration uses a 3/8-24 UNF thread, a 12 mm unthreaded length, and a 0.5 m (1.6 ft) total probe length. The final -05 identifies the multiple-approval configuration, including CSA, ATEX, and IECEx approvals.
Reverse mounting is the defining feature of this model. Instead of requiring access from the sensing end, the probe is installed from the rear of the mounting arrangement, making it particularly useful for restricted-access machinery housings.
The probe uses eddy-current proximity sensing to measure the position and dynamic movement of conductive targets without physical contact. In a correctly matched 3300 XL system, it can provide dependable measurements for vibration, shaft position, and Keyphasor-related applications.
Technical Specifications
The 330195 series is the 3/8-24 UNF threaded reverse-mount version of the 3300 XL 8 mm ETR probe. The ordering configuration for this model identifies a 02 reverse-mount unthreaded option, 12 case configuration, 05 total length, and 05 multiple-agency approval.
| Specification | 330195-02-12-05-05 |
|---|
| Manufacturer | Bently Nevada |
| Product Family | 3300 XL |
| Product Type | 8 mm ETR Reverse Mount Probe |
| Model Number | 330195-02-12-05-05 |
| Probe Series | 330195 |
| Mounting Style | Reverse Mount |
| Thread | 3/8-24 UNF |
| Unthreaded Length | 12 mm |
| Total Probe Length | 0.5 m (1.6 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 Begins | 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 | 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 System | 3300 XL 8 mm Proximity Transducer System |
Applications
The 330195-02-12-05-05 is intended for rotating machinery applications where access to the probe from the front is restricted. Its reverse-mount construction allows the probe to be installed from the opposite side of the mounting arrangement while maintaining the non-contact sensing principle of the 3300 XL system.
Typical applications include:
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Steam turbine shaft vibration monitoring
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Gas turbine machinery protection
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Compressor vibration measurement
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Generator shaft-position monitoring
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Pump and motor monitoring
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Fluid-film bearing machinery
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Radial shaft vibration measurement
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Axial position monitoring
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Keyphasor reference applications
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Speed measurement
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Critical rotating equipment protection
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High-temperature industrial machinery
The probe produces an electrical output related to the distance between its sensing tip and the conductive target. This allows the same basic transducer technology to support both static position measurements and dynamic vibration measurements.
The 0.5 m configuration is a convenient choice when the associated Proximitor Sensor is located relatively close to the probe. For a complete installation, the probe should be paired with the appropriate extension cable and Proximitor Sensor according to the intended system length.
Advantages
Reverse-mount installation
The biggest advantage of the 330195 is its reverse-mount configuration. It is designed for machinery locations where a standard probe cannot be conveniently installed from the sensing side.
Compact 0.5-meter configuration
The 0.5 m total length keeps the transducer assembly compact and is well suited to installations where the monitoring electronics are positioned close to the machinery.
3/8-24 UNF thread
The 3/8-24 UNF mounting thread provides compatibility with the corresponding reverse-mount installation hardware and distinguishes this model from the M10 x 1 330196 family.
High sensitivity
With a nominal sensitivity of 7.87 V/mm (200 mV/mil), the probe provides a well-defined output response suitable for precision shaft vibration and position monitoring.
2.0 mm linear range
The specified 2.0 mm (80 mil) linear range provides useful measurement capability for dynamic machinery applications when the probe is correctly installed and gapped.
ETR capability
The Extended Temperature Range design makes the probe appropriate for demanding machinery environments where conventional temperature capability may not be sufficient.
Multiple international approvals
The -05 agency option provides CSA, ATEX, and IECEx approvals, making this configuration attractive for installations where hazardous-area or international certification requirements must be addressed.
Compact cable profile
The approximately 2.54 mm cable diameter allows relatively flexible routing in confined machinery spaces. Maintaining the specified minimum bend radius helps protect the cable and preserve installation reliability.
Purpose-built machinery monitoring
The probe is designed as part of the 3300 XL proximity transducer architecture rather than as a standalone displacement sensor. When correctly matched with the appropriate extension cable and Proximitor Sensor, it provides a complete solution for critical machinery monitoring.
Technical FAQs
1. What is the Bently Nevada 330195-02-12-05-05?
It is a 3300 XL 8 mm Extended Temperature Range Reverse Mount Proximity Probe with a 3/8-24 UNF thread, 12 mm unthreaded length, 0.5 m total length, and multiple international agency approvals.
2. What does “reverse mount” mean?
A reverse-mount probe is installed from the rear or opposite side of the mounting arrangement, rather than being inserted from the sensing side like a conventional forward-mount probe. This configuration is useful when front access is restricted.
3. What thread does this probe use?
The 330195-02-12-05-05 uses a 3/8-24 UNF thread. The M10 x 1 reverse-mount equivalent belongs to the 330196 family.
4. What does the “12” indicate?
The 12 identifies the specified reverse-mount mechanical case configuration associated with this model, with a listed 12 mm unthreaded length.
5. How long is the probe?
The total probe length is 0.5 m (1.6 ft).
6. What is the sensing tip diameter?
The probe has an 8.0 mm (0.31 in) diameter sensing tip.
7. What is the sensitivity?
The nominal sensitivity is 7.87 V/mm (200 mV/mil).
8. What is the linear measurement range?
The specified linear range is 2.0 mm (80 mils), beginning approximately 0.25 mm (10 mils) from the probe tip.
9. What approvals does the -05 version provide?
The final -05 agency approval option indicates CSA, ATEX, and IECEx approvals.
10. What should be checked before replacing this probe?
Verify the complete configuration, particularly reverse-mount geometry, 3/8-24 UNF thread, 12 mm unthreaded length, 0.5 m total length, ETR cable construction, connector configuration, agency approval, and compatible Proximitor Sensor. A standard forward-mount 3300 XL 8 mm probe should not be treated as a direct mechanical replacement simply because the sensing tip has the same diameter.
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