21505-00-40-05-02 | Bently Nevada Vibration Probe

Bently Nevada 21505-00-40-05-02 Proximity Probe System

Product Introduction

The Bently Nevada 21505-00-40-05-02 forms a complete 7200 Proximity Transducer System. This system provides non-contact vibration and position measurements for rotating machinery. The 8 mm probe diameter and standard case construction make it suitable for many industrial applications. Furthermore, this model includes a stainless steel lead armor for added cable protection. The system supports a wide operating temperature range, making it reliable in harsh environments. For instance, the probe and extension cable function from -30°F to +350°F.

Technical Specifications

The 21505 series offers flexible configurations to meet varied installation needs. Unthreaded length option 00 provides 0.0 inches of unthreaded probe length. This configuration suits standard mounting applications without needing an unthreaded section. Overall case length option 40 specifies a 4.0-inch case. This dimension determines the probe's overall physical length for mounting purposes. Total length option 05 indicates a 0.5-meter (20-inch) cable. Additionally, connector option 02 adds a miniature male coaxial connector for easy system integration.

The tip construction features an 8 mm diameter with standard case configuration. Thread type 3/8-24 ensures secure mounting in compatible housings. The lead armor uses stainless steel, which protects the cable from mechanical damage. For power requirements, the system accepts -17.5 Vdc to -26 Vdc at 12 mA maximum consumption. This input range allows flexible integration with existing power supplies.

Output Characteristics

The 21505-00-40-05-02 provides a calibrated range of 80 mils (2.0 mm) . This measurement begins at approximately 10 mils (0.25 mm) from the probe face. Therefore, the system offers accurate readings across a wide gap range. Scale factor measures 200 mV/mil (7.87 V/mm) with ±4% accuracy when calibrated as a system. This includes interchangeability errors within ±9.5%. Linearity remains within 0.8 mils (0.02 mm) of a 200 mV/mil straight line for system calibration. Including interchangeability errors, linearity stays within 2.3 mils (0.06 mm).

Frequency response spans from 0 to 10 kHz (0 to 600,000 cpm) . At 10 kHz, the response drops by only -5%, which maintains signal integrity at high speeds. Temperature sensitivity typically shows a -3% change in scale factor at +150°F (+65°C) at 50 mils gap (1.27 mm). This predictable behavior enables compensation for temperature variations during operation.

Environmental and Mechanical Limits

The Bently Nevada 21505 system operates reliably under extreme conditions. The Proximitor operates from -60°F to +212°F (-51°C to +100°C). Meanwhile, the probe and extension cable function from -30°F to +350°F (-34°C to +177°C). This wide range accommodates both cold startups and high-temperature processes. Relative humidity tolerance reaches 95% non-condensing, which prevents moisture-related issues.

Corrosion resistance applies specifically to 8 mm probes like this model. Direct contact with air, water, lube oil, ammonium hydroxide, and sulfuric acid (10%) does not affect probe operation. Additionally, MEK (methyl-ethyl ketone) or DMF (Dimethylformamide) also cause no performance degradation. This chemical resistance enhances suitability for petrochemical and refinery applications. System weight measures approximately 1.3 lbs (0.59 kg). With packaging, the gross weight reaches about 0.70 kg.

Installation Guidance

Installing the 21505-00-40-05-02 requires careful attention to probe positioning. First, ensure the mounting threads (3/8-24) match the housing's threaded hole. Tighten the probe securely without over-torquing to prevent thread damage. Then, connect the miniature male coaxial connector to the extension cable. This connection provides a reliable signal path for vibration data.

Proper gap setting proves critical for accurate measurements. The calibrated range begins at 10 mils from the probe face. Therefore, set the initial gap within this range for optimal performance. For best results, use a calibration fixture to verify the scale factor before installation. This procedure ensures measurement accuracy matches the specified ±4% tolerance. Also, verify the power supply provides the correct -17.5 Vdc to -26 Vdc input.

Packaging and Delivery

Your purchase ships as a new, original unit in factory packaging. The package contains the following items:

• 1 x 21505 Proximity Transducer System (complete assembly)

• 1 x 8 mm probe with attached cable and coaxial connector

• 1 x Installation and setup documentation

We ship the product new and guarantee its authenticity. The packaging prevents damage during transit. We ship worldwide using trusted couriers. Our standard shipping partners include FedEx, UPS, and DHL.

Frequently Asked Questions (FAQ)

1. What is the primary application for the 21505-00-40-05-02?
This system provides non-contact vibration and position monitoring for turbomachinery. Common applications include compressors, turbines, and pumps requiring continuous machine protection.

2. What probe diameter and thread size does this model use?
The 21505-00-40-05-02 features an 8 mm diameter probe with 3/8-24 threads. This standard configuration fits many existing mounting provisions.

3. What is the calibrated range and scale factor for this system?
The system provides an 80 mil (2.0 mm) calibrated range with a 200 mV/mil scale factor. Accuracy reaches ±4% when you calibrate it as a complete system.

4. What temperature range can this probe withstand?
The probe and extension cable operate from -30°F to +350°F (-34°C to +177°C). The Proximitor operates from -60°F to +212°F (-51°C to +100°C).

5. Does this probe resist chemical exposure in industrial environments?
Yes. The 21505 8 mm probe withstands contact with air, water, lube oil, ammonium hydroxide, 10% sulfuric acid, MEK, and DMF without performance loss.