Bently Nevada 330702-00-30-90-02-00 | 3300 XL Armored Probe

330702-00-30-90-02-00 Bently Nevada 3300 XL 11 mm Armored Probe

Product Introduction

The Bently Nevada 330702-00-30-90-02-00 belongs to the renowned 3300 XL series and features an armored cable construction for enhanced durability. This 3300 XL 11 mm probe serves non-contact vibration and displacement measurement on fluid film bearing machines, including steam turbines, compressors, and large pumps. Its 11 mm tip delivers a longer linear range than standard 8 mm systems, which makes it particularly suitable for axial position monitoring and eccentricity detection. The built-in stainless steel armor protects the cable from abrasion, cutting, and crushing forces, making this model ideal for installations with limited clearance or exposed cable runs. The probe outputs a voltage signal that varies proportionally with the gap between the tip and the conductive target, enabling precise machine condition assessment. Because of its armored design and proven reliability, the 330702-00-30-90-02-00 is a top choice for maintenance engineers working in demanding petrochemical and power generation facilities. This model also features a 1/2-20 UNF thread for straightforward mounting into standard probe holders.

Technical Specifications

Probe Configuration and Ordering Code

The part number 330702-00-30-90-02-00 defines each configuration option clearly. The unthreaded length option "01" specifies a 0.1-inch unthreaded segment between the probe tip and the threaded section, which provides slight positioning flexibility during installation. The overall case length option "20" indicates a 2.0-inch case that supports the internal coil assembly while maintaining a compact profile. Meanwhile, the total length option "10" denotes a 1.0-metre (3.3 feet) cable, offering adequate reach for most machine installations while minimizing excess cable management. For the connector and cable type, option "02" provides a miniature coaxial ClickLoc connector, which incorporates a positive locking mechanism that resists loosening from machinery vibration. Finally, the agency approval option "00" means this probe carries no specific third-party certifications, which remains standard for this product line.

Armored Cable Design

The defining feature of the 330702-00-30-90-02-00 is its stainless steel armor covering the probe cable. This armor provides superior protection against mechanical stress, including impact, abrasion, and crushing forces that commonly occur during installation or maintenance activities. The armored construction also resists damage from incidental contact with rotating machinery components, which significantly extends the probe's service life in challenging environments. Despite the added protection, the cable maintains a minimum bend radius of 25.4 mm (1.0 inch) with the armor installed, which preserves routing flexibility. The triaxial FEP-insulated cable continues to deliver excellent electrical performance, with the armor serving as an additional mechanical barrier without compromising signal integrity.

Electrical and Material Properties

The probe exhibits a dc resistance of 5.9 ± 0.5 ohms from the center conductor to the outer conductor, which ensures consistent electrical behaviour across the 1.0-metre cable length. Furthermore, the probe cable features a 75 Ω triaxial design with fluoroethylene propylene (FEP) insulation, which offers outstanding dielectric properties and resistance to chemicals, oils, and solvents. The probe tip uses polyphenylene sulfide (PPS), a high-performance thermoplastic that withstands wear and maintains dimensional stability under varying temperatures. In addition, the probe case utilizes AISI 304 stainless steel (SST), which provides excellent corrosion resistance and structural integrity in industrial atmospheres. These carefully selected materials contribute to the probe's long service life and measurement accuracy.

Environmental and Operating Conditions

The 330702-00-30-90-02-00 operates reliably across a wide temperature range from -51°C to +177°C (-60°F to +351°F). However, exposing the probe to temperatures below -34°C (30°F) may cause premature failure of the pressure seal, so operators should consider this limitation during cold startup conditions. For storage, the same temperature limits apply, allowing flexibility in warehouse environments. Additionally, the probe incorporates a Viton O-ring to seal differential pressure between the tip and case, which provides excellent resistance to high-temperature oil and process fluids. While the probe does not undergo pressure testing before shipment, the sealing design meets standard industrial requirements for most turbine and compressor applications.

Thread and Torque Specifications

The probe case features a 1/2-20 UNF thread with a maximum thread engagement length of 0.750 inches. This standard thread size ensures broad compatibility with common mounting hardware across various machine types. For installation, the maximum recommended tightening torque is 15.2 N•m (133 in•lb), while the rated maximum reaches 45.2 N•m (400 in•lb). Importantly, operators should stay below the recommended torque to prevent damage to the probe case or internal components. For the ClickLoc connector, the recommended torque is finger tight, with a maximum of 0.565 N•m (5 in•lb) to avoid over-tightening and potential connector damage.

Mechanical and Environmental Data

Physical Dimensions and Weight

The probe's overall length, including the cable, is 1.0 metre, with a case length of 2.0 inches. The compact mechanical design ensures it does not interfere with adjacent machine components. Additionally, the shipping weight is only 0.19 kg, which is slightly higher than the non-armored version due to the added stainless steel protection. The probe originates from U.S.A. manufacturing, reflecting rigorous production standards and quality control practices.

Pressure Sealing and Application Notes

The 3300 XL 11 mm probe effectively seals differential pressure between the probe tip and case, which is particularly critical in pressurized bearing housings found in turbines and compressors. The Viton O-ring provides a reliable seal against oil and process fluids across the full temperature range. However, note that the probe does not undergo pressure testing prior to shipment. For applications with specific pressure certification requirements, contact the custom design department to arrange a pressure seal test. Nevertheless, the standard design suits the vast majority of industrial rotating machinery applications without modification.

Installation Guide

Mounting Preparation

Before installing the 330702-00-30-90-02-00, inspect the mounting hole and clean it thoroughly to remove any debris or contaminants. The 1/2-20 UNF thread requires a mating hole with a minimum thread engagement of 0.750 inches for secure mechanical mounting. Meanwhile, ensure the target surface has a proper ground connection to maintain accurate eddy-current measurements. We recommend applying a thread-locking compound in high-vibration environments, although this is not mandatory for standard applications.

Cable Routing and Armor Considerations

When routing the armored triaxial FEP cable, avoid sharp bends and maintain a bend radius above 25.4 mm to prevent damage to the internal conductors. The stainless steel armor provides excellent mechanical protection, but you should still secure the cable with appropriate clips or ties to prevent excessive strain on the connector. For the ClickLoc connector, simply push and twist to lock, which ensures a secure and vibration-resistant connection. The connector requires only finger-tight torque, so no tools are necessary. Furthermore, keep the connector clean and dry before mating to preserve signal integrity.

Initial Setup and Calibration

After installation, perform a calibration using a target material that matches the machine's shaft material composition. Typically, the probe requires a 1.5 mm gap for optimal linear range performance. Use a voltage divider or signal conditioner to convert the probe's output to a usable range for your monitoring system. For precise measurements, follow the manufacturer's gap-voltage curve specific to the 3300 XL series. Finally, verify the output signal at multiple gap positions to confirm linearity across the intended measurement range.

Packaging List

The package includes the following items:

• Bently Nevada 330702-00-30-90-02-00 3300 XL 11 mm Armored Proximity Probe (1 unit)

• Quick start installation guide

• Anti-static protective packaging bag

Note: This package does not include calibration certificates or warranty documents. The probe ships as a standalone sensor assembly.

Shipping Information

We dispatch all orders via FedEx, UPS, or DHL, depending on your location and selected shipping method. We provide tracking numbers upon shipment confirmation. The gross weight of 0.19 kg ensures economical shipping, even for express international services. For customs clearance, please ensure your documentation accurately reflects the product description and value.

Frequently Asked Questions (FAQ)

1. What makes the 330702-00-30-90-02-00 different from the non-armored version?
This model includes stainless steel armor over the cable, which provides superior protection against abrasion, cutting, and crushing forces. The non-armored version (330701 series) lacks this mechanical shield. Choose the armored version for harsh environments or exposed cable runs.

2. Can I use this probe in a high-temperature steam environment?
Yes, the probe operates reliably up to +177°C (+351°F). The Viton O-ring and FEP insulation resist steam and high-temperature conditions effectively. However, avoid exposing the probe to temperatures below -34°C (30°F) to protect the pressure seal.

3. How do I maintain the minimum bend radius with the armor installed?
The minimum bend radius remains 25.4 mm (1.0 inch) with the armor installed, which is the same as the non-armored version. Use a bending template or radius gauge to ensure you do not exceed this limit during routing.

4. Is the armored cable field-repairable if damaged?
No, the armored cable is factory-terminated and not field-repairable. If the cable sustains damage, you must replace the entire probe assembly. Proper routing and protection during installation help prevent such damage.

5. What is the recommended gap voltage for this probe?
The typical operating gap is 1.5 mm, which corresponds to approximately -9.0 Vdc output with a standard 3300 XL driver. However, you must perform on-site calibration using the actual shaft material to determine the precise gap-voltage relationship for your specific application.