Bently Nevada 21505-22-55-10-02 Proximity Probe 8mm

21505-22-55-10-02 Bently Nevada Proximity Probe

Product Introduction

The Bently Nevada 21505-22-55-10-02 is a rugged 8 mm proximity probe designed for non-contact vibration and position measurement in demanding industrial settings. This sensor belongs to the 7200 series transducer systems and delivers accurate shaft monitoring capabilities. It effectively measures shaft vibration, thrust position, and eccentricity in critical rotating machinery. This particular model provides a 2.2-inch unthreaded length and a 5.5-inch overall case length. Furthermore, its total length reaches 1.0 meter (39 inches) with a miniature male coaxial connector. The inclusion of stainless steel lead armor offers superior cable protection against mechanical damage and abrasion.

Technical Specifications

The 21505-22-55-10-02 delivers consistent and reliable performance under challenging conditions. Its core strength lies in its precise output and broad frequency response.

The device operates on a DC supply ranging from -17.5 Vdc to -26 Vdc, with a maximum current consumption of 12 mA. It offers a standard calibrated range of 80 mils (2.0 mm). The measurement range begins at approximately 10 mils (0.25 mm) from the probe face. The system provides a scale factor of 200 mV/mil (7.87 V/mm). When calibrated as a system, the accuracy is within ±4%. Including interchangeability errors, the tolerance is within ±9.5%. The linearity is within 0.8 mils (0.02 mm) of a 200 mV/mil straight line for a system calibration. Moreover, it remains within 2.3 mils (0.06 mm) when accounting for probe interchangeability. This sensor boasts a frequency response from 0 to 10 kHz (0 to 600,000 cpm), with a -5% deviation at the upper limit of 10 kHz.

Environmental Limits and Durability

The Bently Nevada 21505-22-55-10-02 is specifically engineered to withstand harsh industrial environments. Its robust construction, including the lead armor, ensures long-term stability and reliable operation.

The probe and its extension cable function flawlessly in temperatures ranging from -30°F to +350°F (-34°C to +177°C). The Proximitor can operate in even more extreme conditions, from -60°F to +212°F (-51°C to +100°C). This 8 mm probe is exceptionally resistant to corrosion. Its operation remains unaffected by direct contact with air, water, lube oil, ammonium hydroxide, 10% sulfuric acid, MEK, or DMF. It performs reliably in relative humidity levels up to 95%, non-condensing. The stainless steel lead armor provides an additional layer of protection, making this probe ideal for installations where cable abrasion or mechanical stress is a concern.

Installation and Mechanical Details

Proper installation is straightforward with the specified mechanical configuration. The 21505-22-55-10-02 features a standard case and specific threading for secure mounting.

The case uses a standard 3/8-24 thread for easy installation into standard mounting holes. The probe tip has an 8 mm diameter and includes stainless steel lead armor for enhanced cable durability. The total length option is 1.0 metre (39 inches) with a tolerance of +.25 metre and -.10 metre. Therefore, you can mount the probe using the 3/8-24 thread, ensuring the unthreaded length of 2.2 inches is correctly positioned for optimal measurement. The lead armor should be routed carefully to avoid sharp bends that could compromise cable integrity.

Packaging and Shipping

We understand the importance of receiving your components in perfect condition. Consequently, each Bently Nevada 21505-22-55-10-02 is shipped in its original factory packaging, guaranteeing its new and untouched status. For your convenience, we ship all orders using premium courier services. We primarily use FedEx, UPS, and DHL to ensure fast and reliable delivery to your facility.

Frequently Asked Questions (FAQ)

1. What is the primary application for the 21505-22-55-10-02 probe?
This sensor is primarily used for non-contact vibration and position monitoring of rotating machinery. For instance, it is ideal for measuring shaft vibration, thrust position, and eccentricity in turbines, compressors, and pumps. The lead armor makes it particularly suitable for installations with high cable wear risks.

2. What is the difference between the 21504 and 21505 series probes?
The 21505 series, including the 21505-22-55-10-02, features stainless steel lead armor for enhanced cable protection. The 21504 series does not include lead armor, making the 21505 better suited for harsh environments where cable damage is a concern.

3. Is the 21505-22-55-10-02 a complete system?
No, this part number specifically refers to the probe and cable assembly. However, it must be used with a compatible Bently Nevada Proximitor and extension cable to form a complete, calibrated transducer system.

4. What is the significance of the unthreaded length option "22"?
The "22" in the part number indicates an unthreaded length of 2.2 inches. This dimension determines the sensing distance from the mounting surface and is critical for proper gap calibration.

5. What is the frequency response of this specific model?
The 21505-22-55-10-02 offers a flat frequency response from 0 to 10 kHz (600,000 cpm). This makes it suitable for detecting both static position changes and high-frequency dynamic vibrations.