Bently Nevada 330105-02-12-30-02-05 Reverse Mount Probe

Bently Nevada 3300 XL 8 mm Reverse Mount Probe – Model 330105-02-12-30-02-05

Product Introduction

The Bently Nevada 330105-02-12-30-02-05 belongs to the trusted 3300 XL series of eddy current proximity probes. Specifically, this reverse mount configuration suits applications where space constraints require the probe cable to exit away from the measurement target. With a 3.0 meter overall length and a miniature ClickLoc connector, this model simplifies field wiring while maintaining signal integrity. Furthermore, its agency approvals for explosive atmospheres make it a versatile choice for turbines, compressors, and pumps in oil, gas, and power generation industries. This 3300 XL 8 mm reverse mount probe delivers the precision and durability that Bently Nevada is known for worldwide.

Technical Specifications

Electrical Characteristics

The 330105-02-12-30-02-05 exhibits a nominal probe DC resistance of 8.17 ± 0.50 Ω measured from the center conductor to the outer conductor. This consistent resistance ensures accurate signal transmission between the probe tip and the monitoring system. Additionally, the 3.0 meter cable length provides ample reach for most machine train installations without introducing significant signal degradation.

Mechanical Dimensions

This reverse mount probe features a 3/8-24 thread with a maximum thread engagement length of 0.563 inches. The overall package measures 20.4 cm x 22.2 cm x 3.7 cm, making it compact enough for retrofit projects. Its weight is approximately 323 grams per meter, so the total unit weighs just under 1 kilogram. For context, the probe case is manufactured to strict tolerances, ensuring a secure fit in standard mounting fixtures.

Environmental Ratings

Temperature performance is a key strength of this sensor. The standard operating range spans from -52°C to +177°C. For more demanding applications, the extended temperature version supports probe tip temperatures up to +218°C and cable/connector temperatures up to +260°C. However, please note that exposing the probe to temperatures below –34°C may lead to premature pressure seal failure. Therefore, careful attention to ambient conditions is essential for long-term reliability.

Additionally, the probe demonstrates exceptional humidity tolerance. When tested at 93% relative humidity per IEC standard 68-2-3 for up to 56 days, the Average Scale Factor (ASF) changes by less than 3%. This stability makes the 330105-02-12-30-02-05 suitable for humid environments such as offshore platforms and tropical installations.

Hazardous Area Approvals

The Bently Nevada 330105-02-12-30-02-05 carries multiple certifications for explosive atmospheres. Specifically, when installed with intrinsically safe zener barriers per drawing 141092 or with galvanic isolators, it achieves Class I, Zone 0: AEx/Ex ia IIC T5...T1 Ga; plus Class I, II, III Division 1 group ratings. Alternatively, for non-incendive circuits per drawing 140979, it qualifies as Class I, Zone 2: AEx/Ex nA IIC T5…T1 Gc and Class I, Division 2 groups A, B, C, D. Consequently, this single probe model can address a wide spectrum of hazardous area classifications.

Temperature Classification Schedule

For EPL Ga and Gc environments, the ambient temperature classifications (probe only) are as follows:

• 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, the temperature classes are defined as T280°C, T225°C, T170°C, T130°C, T105°C, and T90°C across corresponding ambient ranges. Therefore, users must select the appropriate temperature classification based on their specific application's maximum surface temperature requirements.

Mechanical & Environmental Parameters

Pressure Sealing Capability

The 3300 XL 8 mm probes are engineered to seal differential pressure between the probe tip and the case. This sealing mechanism uses a Viton® O-ring, which provides robust chemical and thermal resistance. However, it is important to note that probes are not pressure tested prior to shipment. Hence, end-users should perform their own leak checks upon installation if pressure integrity is mission-critical.

Relative Humidity Performance

As previously mentioned, the probe exhibits less than a 3% shift in ASF after 56 days of 93% humidity exposure. This performance ensures measurement consistency even in condensing environments. Moreover, the cable and connector materials are selected to resist moisture ingress, further enhancing field reliability.

Installation Guidelines

Proper installation of the Bently Nevada 330105-02-12-30-02-05 begins with verifying thread engagement. The 3/8-24 thread should be engaged to at least 0.563 inches to ensure mechanical stability. Next, route the cable carefully to avoid sharp bends or crushing, as this could alter the DC resistance and affect calibration. For hazardous area installations, strictly follow the interconnection drawings (141092 for intrinsic safety or 140979 for non-incendive circuits). Additionally, ensure that the ambient temperature remains within the specified classification for your application's T-rating. Finally, use the miniature ClickLoc connector to establish a secure coaxial connection that resists vibration-induced loosening.

Packaging List

• Bently Nevada 330105-02-12-30-02-05 reverse mount probe (1 unit)

• Miniature ClickLoc coaxial connector (pre-installed)

• Product documentation sheet (installation overview)

Note: No calibration certificates or warranty documents are included in this package.

Shipping Information

All orders are dispatched via FedEx, UPS, or DHL with full tracking and insurance coverage. Please allow 2–3 business days for order processing before shipment.

Frequently Asked Questions

1. What is the total length of the Bently Nevada 330105-02-12-30-02-05?
The total length is 3.0 meters, as indicated by the -30 option in the model number. This measurement includes the probe tip, cable, and connector.

2. Can I use this reverse mount probe in a Zone 0 hazardous area?
Yes, when installed with appropriate intrinsic safety barriers per drawing 141092, the 330105-02-12-30-02-05 achieves Class I, Zone 0 certification (AEx/Ex ia IIC). Therefore, it is suitable for Zone 0 applications.

3. What is the thread size and engagement length for this probe?
The probe case thread is 3/8-24, and the maximum recommended thread engagement length is 0.563 inches. Ensure proper engagement to maintain mechanical stability.

4. What is the DC resistance specification for the 330105-02-12-30-02-05?
The nominal DC resistance from the center conductor to the outer conductor is 8.17 Ω with a tolerance of ±0.50 Ω. This value is measured at room temperature.

5. Does this probe work with existing Bently Nevada 3300 monitoring systems?
Absolutely. The 330105-02-12-30-02-05 is fully compatible with all Bently Nevada 3300 series monitoring systems and proximitor sensors, ensuring seamless integration into your current setup.