Proximity Probe 330876-01-90-00-CN Bently Nevada

Bently Nevada 330876-01-90-00-CN 3300 XL 50mm Probe

Product Introduction

The Bently Nevada 330876-01-90-00-CN belongs to the trusted 3300 XL series. Specifically, this 50 mm proximity probe excels in harsh turbine environments. Consequently, it provides precise vibration and position measurements. Furthermore, its robust build ensures long-term stability. Therefore, this model is a top choice for critical machinery protection.

Technical Specifications

This section details the core technical parameters of the 330876-01-90-00-CN.

Electrical Characteristics

The probe features a DC resistance of 8.9 ± 1.1 Ω from the center to the coaxial conductor. This specification applies specifically to the 9.0-meter total length option. Moreover, this resistance value ensures accurate signal transmission over long cable runs.

Temperature Ratings

The 3300 XL 50 mm probe operates continuously from -35°C to +200°C (-31°F to +392°F). Additionally, it withstands intermittent temperatures up to +250°C (+482°F) for less than 24 hours. This thermal capability makes it suitable for steam turbine DE environments where heat levels fluctuate significantly.

Cable and Connector Design

First, this model uses a 75 Ω triaxial cable with PFA insulation. Next, the High Temperature FluidLoc cable comes standard on all 50 mm probes. Moreover, special high-temperature ClickLoc connectors are standard on both the probe and extension cable. For instance, the ClickLoc connector includes a removable collar. This feature simplifies routing the cable through tight clearances. Meanwhile, each probe and cable includes connector protectors and a disposable installation tool. These accessories ensure the connectors remain free from contamination during setup.

Case and Thread Details

The probe case uses AISI 304 stainless steel. Furthermore, it features a straight exit with ½-20 English threads. The maximum thread engagement length is 0.750 inches. Additionally, the overall case diameter is 1.99 inches. The locknut includes predrilled safety wire holes for secure mounting.

Tip Material

Specifically, the probe tip is made from Polyphenylene Sulfide (PPS). This material provides excellent chemical resistance and dimensional stability at elevated temperatures.

Available Length Options

Besides the 9.0-meter version, this probe series also comes in 1.0-meter and 5.0-meter total lengths. However, the 330876-01-90-00-CN specifically refers to the 9.0-meter configuration.

Mechanical and Environmental Parameters

Understanding the mechanical limits is crucial for proper application.

• Operating and Storage Temperature: -35°C to +200°C

• Short-term Temperature: +250°C for less than 24 hours

• Probe Case Material: AISI 304 SST

• Probe Tip Material: PPS

• Overall Case Diameter: 1.99 inches

• Thread Size: ½-20

• Maximum Thread Engagement: 0.750 inches

• Cable Type: 75 Ω triaxial, PFA insulated FluidLoc

• Total Probe Length: 9.0 meters (29.5 feet)

These parameters ensure the 330876-01-90-00-CN survives demanding conditions. Additionally, the front and rear seals prevent moisture ingress into the probe tip. This dual-seal design, combined with the FluidLoc cable, offers superior protection in wet environments.

Installation Guidelines

Proper installation ensures optimal performance and longevity. Follow these steps carefully.

Pre-Installation Checks

First, inspect the connector protectors included in the package. The package also contains disposable installation tools. These tools help prevent contamination when mating the connectors. Meanwhile, verify that the mounting hole thread matches the ½-20 specification.

Mounting the Probe

Next, thread the probe into the mounting hole. Use the locknut with predrilled safety wire holes to secure the probe in place. However, do not exceed the 0.750-inch maximum thread engagement. Overtightening may damage the probe case or affect measurement accuracy.

Cable Routing

Furthermore, use the removable collar on the ClickLoc connector. This collar facilitates routing the cable through narrow passages and tight clearances. Specifically, avoid sharp bends that could stress the triaxial cable. Maintain a minimum bend radius as recommended by the manufacturer.

Final Connections

Finally, connect the probe to the extension cable. Ensure the ClickLoc connectors click firmly into place. The connector protectors can be discarded after final installation. Additionally, verify that all connections remain clean and dry before powering up the system.

Post-Installation Verification

After mounting, perform a system check. Verify the probe gap voltage falls within the expected range. Moreover, confirm that the signal remains stable during turbine startup. If issues arise, recheck the thread engagement and cable routing.

Application Scenarios

The 3300 XL 50 mm probe finds widespread use in power generation and heavy industry.

Steam Turbine Monitoring

Specifically, this probe monitors vibration and position in steam turbine DE (direct exhaust) environments. Its high-temperature tolerance makes it ideal for bearing housing measurements.

Gas Turbine Applications

Additionally, the probe suits gas turbine applications where space is limited. The straight exit design and 1.99-inch case diameter allow installation in confined areas.

Compressor and Pump Protection

Furthermore, the 330876-01-90-00-CN protects critical compressors and pumps. Continuous monitoring helps detect early signs of mechanical distress.

Packaging List

Each new unit includes the following items:

• 330876-01-90-00-CN 3300 XL 50 mm Proximity Probe (9.0-meter cable)

• Locknut with predrilled safety wire holes

• Connector protectors (installed on probe and cable ends)

• Disposable connector protector installation tool

• Installation instruction sheet (quick reference)

Shipment method: Fedex, UPS, DHL

Frequently Asked Questions

1. What is the difference between the 330876-01-90-00-CN and shorter-length versions?
The primary difference lies in the total cable length. This model features a 9.0-meter cable, while other versions offer 1.0-meter or 5.0-meter options. The resistance value varies accordingly.

2. Can I use this probe in a wet or steam-laden environment?
Yes. The 3300 XL 50 mm probe includes front and rear seals. Combined with the High Temperature FluidLoc cable, these seals prevent moisture from entering the probe tip.

3. What tools do I need for installation?
You need a wrench for the locknut and standard hand tools. The package includes connector protectors and a disposable installation tool for clean connector mating.

4. How do I know if the probe is functioning correctly?
After installation, measure the DC resistance between the center and coaxial conductor. It should read 8.9 ± 1.1 Ω for the 9.0-meter version. Also, verify the gap voltage during operation.

5. What shipping methods do you offer for this product?
We ship via Fedex, UPS, and DHL worldwide. All orders are dispatched promptly from our warehouse with full tracking information.