Bently Nevada 330101-02-78-05-02-00 | 3300 XL 8mm Probe

330101-02-78-05-02-00 Product Introduction

The Bently Nevada 330101-02-78-05-02-00 serves as the sensing front-end for the 3300 XL 8 mm Proximity Transducer System. This non-contact eddy-current probe accurately measures both static (position) and dynamic (vibration) values of conductive targets. It is widely deployed in fluid-film bearing machines, delivering essential data for predictive maintenance and machine protection strategies.

This 3300 XL 8 mm probe integrates patented TipLoc and CableLoc technologies. These innovations create a stronger bond between the probe tip and body, while the CableLoc design provides 330 N (75 lbf) pull strength for secure cable attachment. Furthermore, the 8 mm diameter offers thicker PPS plastic encapsulation around the probe coil, resulting in superior ruggedness compared to smaller 5 mm probes.

Key Technical Specifications

The 330101-02-78-05-02-00 delivers a linear range of 2 mm (80 mils), beginning at approximately 0.25 mm (10 mils) from the target surface. Its Incremental Scale Factor (ISF) stands at 7.87 V/mm (200 mV/mil) with ±5% interchangeability error for standard systems. For this 0.5-meter configuration, the nominal DC resistance from center to outer conductor measures 7.45 ± 0.50 Ω.

For optimal radial vibration measurement, the recommended gap setting is -9 Vdc, corresponding to 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. Installation torque should follow the recommended value of 11.2 N•m (100 in•lbf) for standard forward-mounted probes, while the first three threads require 7.5 N•m (66 in•lbf).

This specific model incorporates option code 02 for the unthreaded length (2.0 inches), 78 for the overall case length (7.8 inches), and 05 for the total cable length (0.5 meter / 1.6 feet). The connector option 02 provides a Miniature coaxial ClickLoc connector with standard cable, while agency approval option 00 indicates no specific certification is required.

Environmental and Mechanical Ratings

The Bently Nevada 330101-02-78-05-02-00 performs reliably across a broad temperature spectrum. Standard probe tips operate from -52°C to +177°C (-62°F to +350°F). However, temperatures below –34˚C (-30˚F) may compromise the pressure seal's integrity, potentially leading to premature failure. The probe case utilizes AISI 303 or 304 stainless steel, and the tip consists of durable Polyphenylene sulfide (PPS) material.

Regarding pressure capabilities, the 3300 XL 8 mm probes seal differential pressure between the tip and case using a Viton® O-ring. While Bently Nevada does not pressure-test probes before shipment, you can arrange custom testing through their design department for application-specific requirements. Additionally, the probe demonstrates less than a 3% change in Average Scale Factor (ASF) after 56 days of 93% humidity testing per IEC standard 68-2-3.

For hazardous area installations, the 330101-02-78-05-02-00 follows specific temperature classification schedules. EPL Ga and Gc classifications range from T1 (-55°C to +232°C ambient) through T5 (-55°C to +40°C ambient). For EPL Dc environments, classifications include T280°C through T90°C with corresponding ambient temperature limits, ensuring safe operation in potentially explosive atmospheres.

Installation Guidelines

Proper installation of the 3300 XL 8 mm probe ensures accurate measurements and long service life. Begin by observing the thread engagement limits: the maximum length is 0.563 inches. Apply the recommended torque of 11.2 N•m (100 in•lbf) for standard forward-mounted probes to avoid case damage. For the first three threads, reduce torque to 7.5 N•m (66 in•lbf) for secure yet safe mounting.

Field wiring should use 0.2 to 1.5 mm² (16 to 24 AWG) cables, preferably 3-conductor shielded triad with tinned wiring. The maximum cable length between the 3300 XL Proximitor Sensor and the monitor is 305 meters (1,000 feet). When using longer field wiring, be aware of potential signal rolloff at high frequencies—consult the frequency response graphs for your specific system configuration.

The CableLoc design provides 330 N (75 lbf) pull strength, ensuring the cable remains securely attached to the probe tip. For oil-filled applications, consider ordering the optional FluidLoc cable option. This feature prevents oil and other liquids from leaking through the cable's interior, which is particularly valuable in bearing housing installations where fluid ingress poses a concern.

Packaging List

Your shipment of the Bently Nevada 330101-02-78-05-02-00 includes the following items:

• 330101-02-78-05-02-00 3300 XL 8 mm Probe (1 unit)

• Protective shipping cap for the probe tip

• Quick-start installation instruction sheet

• 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. How does the 330101-02-78-05-02-00 differ from the 1.0-meter version?
The primary difference lies in the total cable length: this model uses a 0.5-meter (1.6 feet) cable versus the 1.0-meter version. Additionally, the nominal DC resistance is slightly lower at 7.45 ± 0.50 Ω compared to 7.59 ± 0.50 Ω for the 1.0-meter probe.

2. Can I use this probe with a 9-meter extension cable system?
Yes, you can. However, note that the Incremental Scale Factor changes to ±6.5% for 9-meter systems. The Deviation from best fit straight line (DSL) also increases to ±0.038 mm (±1.5 mil) instead of ±0.025 mm (±1 mil) for standard 1-meter systems.

3. What does the overall case length option 78 (7.8 inches) mean?
The overall case length refers to the total length of the stainless steel probe body from the tip to the end of the threaded section. This 7.8-inch length accommodates deeper installation depths within the machine casing or probe holder.

4. Is this probe suitable for high-temperature environments?
The standard probe tip withstands temperatures up to +177°C (+350°F). For higher temperature applications up to +218°C (+425°F), Bently Nevada offers an Extended Temperature Range (ETR) option. Confirm your temperature requirements before ordering.

5. What is the purpose of the Miniature ClickLoc connector?
The Miniature coaxial ClickLoc connector provides a secure, positive-locking connection between the probe and extension cable. It prevents accidental disconnection due to vibration while maintaining reliable signal transmission in industrial environments.