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

The Bently Nevada 330105-02-12-50-02-05 is a high-performance reverse mount eddy current probe. This sensor measures shaft vibration and position in turbomachinery. It belongs to the trusted 3300 XL series from Bently Nevada. The model 330105-02-12-50-02-05 uses an 8 mm tip diameter for standard applications. Its reverse mount design saves valuable axial space on machinery. You can rely on this probe for critical asset protection.

Technical Specifications of Model 330105-02-12-50-02-05

Electrical and DC Resistance Specifications

The 330105-02-12-50-02-05 has a nominal probe DC resistance of <span style=”color:#e03e2d;”>8.73 ± 0.50 Ω</span> from center to outer conductor. This resistance value applies to the 5.0 meter total length option. The measurement uses a standard ohmmeter across the coaxial connector. Stable resistance ensures consistent probe performance over time. The Bently Nevada 330105-02-12-50-02-05 maintains signal integrity throughout its length.

Mechanical Dimensions and Thread Details

Probe case thread is <span style=”color:#e03e2d;”>3/8-24 UNF</span> for standard mounting hardware. Maximum thread engagement length reaches <span style=”color:#e03e2d;”>0.563 inches</span> for secure installation. Total package dimensions are <span style=”color:#e03e2d;”>20.4 cm x 22.2 cm x 3.7 cm</span>. The probe weighs <span style=”color:#e03e2d;”>323 grams per meter (11.4 oz per meter)</span> of length. Total weight for the 5.0 meter probe is approximately 1.62 kg.

Temperature Range and Pressure Sealing

Standard probe operating temperature spans <span style=”color:#e03e2d;”>-52°C to +177°C (-62°F to +350°F)</span>. Extended range allows the probe tip to reach <span style=”color:#e03e2d;”>+218°C (+425°F)</span>. The probe cable and connector withstand <span style=”color:#e03e2d;”>-51°C to +260°C</span> for extended options. Do not expose this probe to temperatures below -34°C (-30°F). Such cold exposure may cause premature pressure seal failure. The sealing uses a <span style=”color:#e03e2d;”>Viton® O-ring</span> for differential pressure sealing between tip and case.

Humidity and Environmental Performance

The 330105-02-12-50-02-05 shows less than <span style=”color:#e03e2d;”>3% change in Average Scale Factor (ASF)</span> during humidity testing. This testing follows IEC standard 68-2-3 at 93% relative humidity. The test duration runs for up to 56 days continuously. Such performance ensures reliable operation in humid plant environments. The Bently Nevada 330105-02-12-50-02-05 resists moisture-related drift effectively.

Hazardous Area Approvals for 330105-02-12-50-02-05

The Bently Nevada 330105-02-12-50-02-05 carries agency approval option 05. This includes <span style=”color:#e03e2d;”>CSA, ATEX, and IECEx certifications</span> for global use.

Intrinsically Safe (ia) Approvals

For ia installation with zener barriers or galvanic isolators per drawing 141092:

• 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

Non-Incendive (nA, ec) Approvals

For nA installation with non-incendive circuit 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

For EPL Ga and Gc (probe only):

• T1: -55°C to +232°C

• T2: -55°C to +177°C

• T3: -55°C to +120°C

• T4: -55°C to +80°C

• T5: -55°C to +40°C

For EPL Dc:

• 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

Installation Guide for Bently Nevada 330105-02-12-50-02-05

Proper installation ensures accurate vibration data from your 330105-02-12-50-02-05. Follow these steps for best results.

• Thread Engagement: Use maximum 0.563 inches of thread engagement with the 3/8-24 thread.

• Connector Type: The miniature ClickLoc coaxial connector provides secure locking attachment.

• Cable Routing: Avoid sharp bends or kinks in the 5.0 meter cable during installation.

• Temperature Caution: Keep probe away from temperatures below -34°C to protect the pressure seal.

• Surface Prep: Clean the mounting hole threads before inserting the 3/8-24 probe case.

• Torque Spec: Hand-tighten plus one quarter turn with a wrench for secure mounting.

Do not overtighten the 330105-02-12-50-02-05 into the mounting hole. Overtightening can damage the Viton O-ring seal. Always verify hazardous area classification before installation.

Packaging List for Model 330105-02-12-50-02-05

Your order includes these items in original factory packaging:

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

• One pre-attached 5.0 meter coaxial cable with miniature ClickLoc connector

• One Viton O-ring pre-installed on the probe case

• One protective plastic tip cover for shipping safety

• One anti-static bag for electrostatic discharge protection

No calibration certificates or warranty cards appear inside this package. The box contains only the hardware items listed above. Each unit ships in genuine Bently Nevada protective packaging.

Common FAQs for Bently Nevada 330105-02-12-50-02-05

Q1: What is a reverse mount probe and when should I use it?
A: A reverse mount probe has the connector at the probe tip end. You use it when axial space behind the mounting hole is limited or unavailable.

Q2: Can the 330105-02-12-50-02-05 work in Zone 0 hazardous areas?
A: Yes, this probe carries ia approval for Class I, Zone 0 installations. You must install it with zener barriers or galvanic isolators per drawing 141092.

Q3: What happens if I expose this probe to temperatures below -34°C?
A: Exposure below -34°C may cause premature failure of the pressure seal. The manufacturer warns against such cold exposure for this reason.

Q4: Is the 330105-02-12-50-02-05 pressure tested before shipment?
A: No, these probes are not pressure tested prior to shipment. The Viton O-ring design seals differential pressure during normal operation.

Q5: What length option does the -50 code represent in this model number?
A: The -50 option indicates a 5.0 meter (16.4 feet) total probe length including cable and connector.

Why Choose the Bently Nevada 3300 XL Series?

The 330105-02-12-50-02-05 delivers proven reliability for critical machine monitoring. Its 3300 XL series design offers interchangeability without recalibration. The reverse mount configuration saves space in tight turbine and compressor installations. You get multiple hazardous area approvals for global plant compliance. The wide temperature range covers most industrial turbomachinery applications. Bently Nevada engineers designed this probe for decades of service life. Many power plants and refineries standardize on the 3300 XL series. The Bently Nevada 330105-02-12-50-02-05 remains a top choice for vibration professionals worldwide. Order yours today for immediate deployment on your critical rotating assets.