Reverse Mount Probe 330105-02-12-50-12-05 | Bently Nevada

330105-02-12-50-12-05 Product Introduction

The Bently Nevada 330105-02-12-50-12-05 belongs to the 3300 XL 8 mm reverse mount probe family. Reverse mount probes differ from standard forward mount designs by installing from the outside of the machine casing inward. This configuration proves particularly valuable when internal access is limited or when the target surface is located behind a barrier.

This 3300 XL 8 mm reverse mount probe incorporates the same patented TipLoc and CableLoc technologies found in standard probes. TipLoc provides a robust bond between the tip and body, while CableLoc delivers 330 N (75 lbf) pull strength for secure cable attachment. The 8 mm diameter offers thicker PPS encapsulation, making the probe more rugged and resistant to physical abuse than smaller counterparts.

Key Technical Specifications

The 330105-02-12-50-12-05 offers a linear range of 2 mm (80 mils), beginning at approximately 0.25 mm (10 mils) from the target. Its Incremental Scale Factor (ISF) is 7.87 V/mm (200 mV/mil) with ±5% interchangeability error for standard systems. For this 5.0-meter configuration, the nominal DC resistance from center to outer conductor measures 8.73 ± 0.50 Ω.

The recommended gap setting for radial vibration is -9 Vdc, approximately 1.27 mm (50 mils). The probe case uses a 3/8-24 UNF thread with a maximum engagement length of 0.563 inches. Torque recommendations follow the same values as standard probes: 11.2 N•m (100 in•lbf) for general mounting and 7.5 N•m (66 in•lbf) for the first three threads.

This model incorporates total length option 50 (5.0 meters / 16.4 feet), connector option 12 (Miniature ClickLoc coaxial connector with FluidLoc cable), and agency approval option 05 (CSA, ATEX, IECEx approvals). The physical dimensions measure 20.4 cm x 22.2 cm x 3.7 cm.

Reverse Mount Design and FluidLoc Option

The Bently Nevada 330105-02-12-50-12-05 features a reverse mount configuration. Unlike forward mount probes that install from inside the bearing housing, reverse mount probes thread into the casing from the exterior. This design simplifies installation and maintenance because technicians can access the probe without entering confined spaces.

The FluidLoc cable option (indicated by -12) prevents oil and other liquids from leaking through the cable's interior. However, Bently Nevada notes that this option is not necessary on the vast majority of 330105 and 330106 installations due to the presence of the probe sleeve. Carefully evaluate your application before ordering the FluidLoc option, as the standard configuration may suffice for most installations.

Environmental and Mechanical Ratings

The 330105-02-12-50-12-05 operates across a wide temperature range. Standard probe tips handle -52°C to +177°C (-62°F to +350°F). Extended temperature range options allow tips to reach +218°C (+425°F) and cables to reach +260°C (+500°F). Remember that temperatures below –34˚C (-30˚F) may cause premature failure of the pressure seal.

The probe case uses AISI 303 or 304 stainless steel with a Polyphenylene sulfide (PPS) tip. A Viton® O-ring seals differential pressure between the tip and case. While probes are not pressure-tested before shipment, you can arrange custom testing through Bently Nevada's design department.

The probe shows less than a 3% change in Average Scale Factor (ASF) after 56 days of 93% humidity testing per IEC standard 68-2-3. Weight is 323 g/m (11.4 oz), totaling approximately 1.85 kg for the 5.0-meter length.

Hazardous Area Approvals

The 3300 XL 8 mm reverse mount probe carries comprehensive hazardous area certifications. Agency approval option 05 includes CSA, ATEX, and IECEx approvals, making it suitable for international installations.

Intrinsic Safety (ia) Certification:

• Class I, Zone 0: AEx/Ex ia IIC T5...T1 Ga

• Class I, Groups A, B, C, and D

• Class II, Groups E, F, and G

• Class III

• When installed with intrinsically safe zener barriers per drawing 141092 or galvanic isolators

Non-Incendive (nA, ec) Certification:

• Class I, Zone 2: AEx/Ex nA IIC T5…T1 Gc

• Class I, Division 2, Groups A, B, C, D

• Class I, Zone 2: AEx/Ex ec llC T5…T1 Gc

• When installed with non-incendive circuit per drawing 140979

Temperature Schedule (Probe Only):
For EPL Ga and Gc:

• T1: -55°C to +232°C ambient

• T2: -55°C to +177°C ambient

• T3: -55°C to +120°C ambient

• T4: -55°C to +80°C ambient

• T5: -55°C to +40°C ambient

For EPL Dc:

• T280°C @ Ta: -55°C to +232°C

• T225°C @ Ta: -55°C to +177°C

• T170°C @ Ta: -55°C to +120°C

• T130°C @ Ta: -55°C to +80°C

• T105°C @ Ta: -55°C to +100°C

• T90°C @ Ta: -55°C to +40°C

Installation Guidelines

Installing the 330105-02-12-50-12-05 requires attention to the reverse mount configuration. Thread the probe into the casing from the exterior, ensuring proper engagement of the 3/8-24 UNF threads. The maximum engagement length is 0.563 inches. Apply the recommended torque of 11.2 N•m (100 in•lbf) for standard mounting.

The extended 5.0-meter cable provides installation flexibility when the Proximitor Sensor must be located away from the probe. Use field wiring of 0.2 to 1.5 mm² (16 to 24 AWG), preferably 3-conductor shielded triad cable with tinned wiring. The maximum distance between the 3300 XL Proximitor Sensor and the monitor is 305 meters (1,000 feet).

For hazardous area installations, strictly follow the associated control drawings (141092 for intrinsic safety, 140979 for non-incendive circuits). Install appropriate zener barriers or galvanic isolators as specified to maintain the safety certification.

Packaging List

Your shipment of the Bently Nevada 330105-02-12-50-12-05 includes the following items:

• 330105-02-12-50-12-05 3300 XL 8 mm Reverse Mount Probe (1 unit)

• Protective shipping cap for the probe tip

• Installation instruction sheet (quick-start guide)

• Anti-static packaging bag for safe transport

Note: The package does not include calibration certificates, quality warranty documents, or mounting hardware. These items must be ordered separately if required.

Shipping Information

All orders ship via FedEx, UPS, or DHL with full tracking and insurance coverage. Standard delivery times range from 3 to 7 business days depending on your location. Expedited shipping options are available upon request for urgent deliveries.

Frequently Asked Questions (FAQ)

1. What is the difference between reverse mount and standard forward mount probes?
Reverse mount probes like the 330105-02-12-50-12-05 install from outside the machine casing inward, while forward mount probes install from inside the bearing housing outward. Reverse mount designs simplify access and maintenance because technicians can reach the probe without entering confined spaces.

2. Do I really need the FluidLoc cable option for this probe?
Bently Nevada states that the FluidLoc option is not necessary for the vast majority of 330105 and 330106 installations due to the presence of the probe sleeve. Only order FluidLoc if your specific application involves oil or liquid leakage risks that the sleeve cannot adequately address.

3. What approvals does agency option 05 include?
Option 05 provides CSA, ATEX, and IECEx approvals. This combination covers most international hazardous area requirements, including Class I, Zone 0 (ia) and Zone 2 (nA) certifications, making the probe suitable for global installations.

4. Why does the 5.0-meter probe have higher DC resistance?
The 330105-02-12-50-12-05 has a nominal DC resistance of 8.73 ± 0.50 Ω, which is higher than shorter probes (e.g., 7.45 Ω for 0.5m). This increase is expected due to the longer cable length, which adds inherent resistance to the circuit.

5. Can I use this probe with standard 3300 XL Proximitor Sensors?
Yes, the 3300 XL 8 mm reverse mount probe is fully compatible with all standard 3300 XL Proximitor Sensors. The 7.87 V/mm scale factor remains consistent, so no special calibration is required. Ensure your Proximitor Sensor supports the 5.0-meter cable length.