Bently Nevada 330105-02-12-50-12-05 3300 XL 8mm Reverse Mount Probe

The Bently Nevada 330105-02-12-50-12-05 is a precision reverse mount probe. This device measures shaft vibration and position in turbomachinery. It belongs to the 3300 XL 8 mm series. The Bently Nevada 330105-02-12-50-12-05 installs from the back of the bearing housing.

Key Technical Specifications

This probe has a nominal DC resistance of 8.73 ± 0.50 Ω at 5.0 meters length. The probe case thread is 3/8-24 with maximum engagement of 0.563 inches. Weight is 323 grams per meter (11.4 oz per meter). The probe tip seals differential pressure using a Viton O-ring.

The reverse mount design allows installation without removing the rotor. This saves significant maintenance time during retrofits. The 3300 XL 8 mm platform provides excellent linear range and stability.

Total Length and Connector Options

Total length option is -50 for 5.0 meters (16.4 feet). Connector option is -12 for Miniature ClickLoc coaxial connector with FluidLoc cable. The FluidLoc cable is not necessary for most installations. The probe sleeve already provides adequate fluid protection. Order this option only for special submersion applications.

The ClickLoc connector gives a secure push-pull locking mechanism. It prevents accidental disconnection in high vibration areas. The longer 5.0 meter cable suits machines with distant junction boxes.

Agency Approvals and Hazardous Area Ratings

Agency approval option 05 includes CSA, ATEX, and IECEx certifications. The probe carries ia intrinsic safety approval. It works with zener barriers per drawing 141092 or galvanic isolators. Ratings include:

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

• Class I, Groups A, B, C, D

• Class II, Groups E, F, G

• Class III

For nA, ec non-incendive installations per drawing 140979:

• 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 IIC T5…T1 Gc

Temperature Classification Schedule

The Bently Nevada 330105-02-12-50-12-05 follows this temperature schedule for EPL Ga and Gc:

For EPL Dc (dust environments):

• T280°C at Ta -55°C to +232°C

• T225°C at Ta -55°C to +177°C

• T170°C at Ta -55°C to +120°C

• T130°C at Ta -55°C to +80°C

• T105°C at Ta -55°C to +100°C

• T90°C at Ta -55°C to +40°C

Environmental and Humidity Performance

Probe temperature range spans -52°C to +177°C (-62°F to +350°F). Extended range tips reach +218°C (+425°F). The probe cable and connector handle -51°C to +260°C (-60°F to +500°F). Exposing the probe below -34°C (-30°F) may damage the pressure seal.

Relative humidity testing shows less than 3% change in Average Scale Factor (ASF). This follows IEC standard 68-2-3 for up to 56 days at 93% humidity. The probe resists moisture without performance loss.

Installation Guide

Follow these steps for correct reverse mount installation:

1. Remove the existing probe if replacing a unit.

2. Clean the mounting hole threads with a tap.

3. Screw the 3/8-24 thread into the reverse mount hole.

4. Tighten the probe until the tip reaches the target gap.

5. Lock the probe using the jam nut at 0.563 inch engagement.

6. Connect the ClickLoc connector until it clicks firmly.

7. Route the 5.0 meter cable away from hot or moving parts.

8. Verify the gap voltage with a proximity system.

Do not exceed -34°C ambient during storage. Keep the connector dry before mating. Use proper barriers for intrinsic safety installations.

Package Contents

The factory packing includes these items:

• One Bently Nevada 330105-02-12-50-12-05 reverse mount probe

• One mating ClickLoc connector pre-attached to cable

• One Viton O-ring (installed on probe tip)

• One installation instruction sheet

No certificates or warranty documents are inside the box. No shipping method like FedEx, UPS, or DHL is listed.

Common FAQs (3-5 questions)

Q1: What is the difference between 3.0m and 5.0m versions?
The 5.0 meter cable allows connection to remote junction boxes. The Bently Nevada 330105-02-12-50-12-05 has higher DC resistance at 8.73 Ω due to longer length.

Q2: Do I need the FluidLoc cable option for my application?
Most installations do not need FluidLoc cable. The probe sleeve provides enough fluid sealing. Only order -12 for submersion in conductive liquids.

Q3: Can I extend the 5.0 meter cable with an extension cable?
Yes, Bently Nevada offers approved extension cables. Total system length must stay within driver specifications.

Q4: What happens if I use this probe below -34°C?
The pressure seal may fail prematurely. The Bently Nevada 330105-02-12-50-12-05 requires storage above -34°C to protect the seal.

Q5: Is this probe compatible with 3300 XL monitors?
Yes, it fully matches the 3300 XL 8 mm proximity system. Use with Bently Nevada 3300 XL monitors for best performance.

Summary for Buyers

The Bently Nevada 330105-02-12-50-12-05 reverse mount probe simplifies turbomachinery maintenance. Its 5.0 meter length and ClickLoc connector provide reliable signal transmission over longer distances. Hazardous area approvals cover ATEX, CSA, and IECEx zones. Order this genuine 3300 XL 8 mm probe for critical vibration monitoring applications.