Bently Nevada 330908-00-20-05-02-00 NSv Probe

3300 NSv Proximity Probe 330908-00-20-05-02-00

Product Introduction

The Bently Nevada 330908-00-20-05-02-00 belongs to the 3300 NSv series, offering a versatile proximity measurement solution with a larger thread size. This 0.5-meter probe features a 3/8-24 UNF thread for enhanced mounting strength. Such a thread design suits applications with higher torque requirements or heavier machinery. Furthermore, the unarmored cable provides excellent flexibility for routing in confined spaces. The probe uses a miniature coaxial ClickLoc connector for reliable signal transmission. This connector locks securely, preventing disconnection from vibration. Additionally, the short 0.5-meter cable length minimizes signal loss and simplifies installation near the Proximitor Sensor. The 330908-00-20-05-02-00 operates across a broad temperature range from -52°C to +177°C. Its lightweight construction reduces mechanical loading on brackets and housings.

Technical Specifications

The 330908-00-20-05-02-00 probe delivers precise and repeatable measurements for critical rotating machinery. Its tip material is polyphenylene sulfide (PPS), which offers outstanding resistance to chemicals and wear. The probe case uses AISI 304 stainless steel (SST) for superior corrosion protection. The cable is a 75 Ω coaxial type, insulated with fluoroethylene propylene (FEP). This insulation maintains signal fidelity even in humid or electrically noisy environments. The total cable length for this option is 0.5 meter. Moreover, the DC resistance from the center conductor to the outer conductor measures 4.0 ± 0.5 ohms. This specific resistance value ensures proper matching with the NSv Proximitor Sensor.

The probe case thread is 3/8-24 UNF, and the maximum thread engagement measures 0.563 inches. The overall case length option is 2.0 inches, while the unthreaded length option is 0 inches. Therefore, the entire case length remains available for thread engagement or mounting. The maximum rated torque for this case size is significantly higher at 33.9 N•m. However, the recommended installation torque is 11.3 N•m to avoid over-stressing the threads or internal components. This higher torque rating compared to smaller threads reflects the increased mechanical strength. Furthermore, the connector-to-connector torque requires only finger tightening. Over-tightening the connector can compromise the coaxial interface and degrade signal quality.

Mechanical and Environmental Parameters

This Bently Nevada 3300 NSv probe withstands demanding environmental conditions. Both operating and storage temperatures range from -52°C to +177°C. Prolonged exposure below -34°C may weaken the pressure seal over time. The probe seals differential pressure between the tip and case using a Viton O-ring. Although designed for pressure sealing, Bently Nevada does not pressure-test these probes before shipment. For pressure-critical applications, you must contact their custom design department for testing services.

The larger 3/8-24 thread provides superior holding power and resistance to loosening. This feature proves especially valuable in high-vibration environments. The probe's overall weight ranges from approximately 14 to 150 grams, depending on cable length. The unarmored version remains lightweight, reducing stress on mounting points. The minimum bend radius for the unarmored cable is 25.4 mm, matching the armored version. This flexibility allows easy routing through conduit or cable trays. Additionally, the probe's compact diameter makes it suitable for installations with limited clearance. The stainless steel case offers excellent durability against corrosion and mechanical impact.

Installation and Mounting Guide

Proper installation of the 330908-00-20-05-02-00 ensures reliable performance and extended service life. First, inspect the 3/8-24 UNF threads for any burrs or contamination. Next, apply a thin layer of anti-seize lubricant to the threads, but avoid the probe tip. Then, thread the probe into the mounting hole by hand until snug. Afterward, use a torque wrench to tighten it to 11.3 N•m. Exceeding this value can deform the probe case and affect calibration accuracy.

Route the unarmored cable carefully to maintain a bend radius greater than 25.4 mm. Sharp bends can degrade the signal quality over time. Secure the cable with appropriate clips or ties at regular intervals. This practice reduces mechanical strain on the ClickLoc connector. Mate the connector with the extension cable until you hear a distinct click. Then, tighten it finger-tight only. Remember, this 0.5-meter probe is intended for use with the corresponding NSv Proximitor Sensor. Using a mismatched sensor may result in erroneous readings. Finally, apply thread sealant to the mounting hole if your application involves pressurized environments. Just ensure the sealant does not contact the sensing tip.

Packaging List

• 1 x Bently Nevada 330908-00-20-05-02-00 Proximity Probe (with integrated 0.5m unarmored coaxial cable)

• 1 x Miniature coaxial ClickLoc connector (factory-installed)

• 1 x Quick-start installation guide (printed)

• 1 x Plastic shipping cap for tip protection

The probe arrives in a static-shielded bag to prevent electrostatic discharge. The outer carton meets FedEx, UPS, and DHL shipping standards. Please retain the original packaging for safe storage or reshipment.

Frequently Asked Questions (FAQ)

1. Can I use the 330908-00-20-05-02-00 with a 1-meter Proximitor?
No. This 0.5-meter probe is calibrated specifically for use with the NSv Proximitor Sensor designed for the same cable length. Using a different length sensor will produce inaccurate measurements.

2. What are the advantages of the 3/8-24 thread?
The larger thread provides higher torque capacity and greater holding strength. This makes it more suitable for heavy machinery or high-vibration applications compared to smaller threads.

3. How do I verify the probe's health?
Measure the DC resistance between the center and outer conductors. For this model, the reading should be 4.0 ± 0.5 ohms. Also, visually inspect the tip for any cracks or wear.

4. Is this probe pressure-rated?
The probe uses a Viton O-ring to seal differential pressure. However, Bently Nevada does not perform pressure testing before shipment. Contact their custom design department if you need certified pressure testing.

5. What shipping carriers do you recommend?
We strongly recommend using FedEx, UPS, or DHL for transit. These couriers provide tracking and insurance, ensuring your probe arrives safely.

6. What if I over-torque the probe during installation?
Over-torquing can strip the 3/8-24 threads or damage the internal sensing coil. Always follow the recommended torque value of 11.3 N•m to avoid such issues.

7. Can this probe withstand high vibration levels?
Yes. The 3300 NSv series is engineered for reliable operation in moderate to high vibration environments. The larger thread and ClickLoc connector ensure a secure installation.

8. How should I store this probe?
Store it in its original anti-static bag, inside a clean and dry cabinet. Keep the temperature between -52°C and +177°C. Avoid contact with corrosive chemicals that may attack the PPS tip or FEP insulation.