21504-00-20-10-02 | Bently Nevada 8mm Vibration Probe

Bently Nevada 21504-00-20-10-02 Standard Proximity Probe System

Product Introduction

The Bently Nevada 21504-00-20-10-02 represents a complete 7200 Proximity Transducer System. This system provides non-contact vibration and position measurements for rotating machinery protection. The standard probe configuration with an 8 mm diameter suits a wide range of industrial applications. Furthermore, the 200 mm overall case length accommodates deeper mounting requirements. The system includes a 1.0-metre cable with a miniature male coaxial connector for straightforward integration. This model also omits lead armor, which makes it suitable for installations where cable protection needs remain minimal.

Technical Specifications

The 21504 series offers flexible configurations for diverse mounting scenarios. Unthreaded length option 00 specifies 0.0 mm of unthreaded probe length. This standard configuration suits conventional mounting applications. Overall case length option 20 indicates a 200 mm case. This dimension determines the probe's physical length for mounting purposes. Total length option 10 specifies a 1.0 metre (39 inches) cable. The tolerance allows +0.25 metre and -0.10 metre (+10 inches, -4 inches) for flexible installation. Additionally, connector option 02 adds a miniature male coaxial connector for reliable signal transmission.

The tip construction features an 8 mm diameter with standard case configuration. Thread type 3/8-24 ensures compatibility with existing mounting provisions. This model includes no lead armor, which differentiates it from armored versions. For power input, the system accepts -17.5 Vdc to -26 Vdc at 12 mA maximum consumption. This wide input range simplifies integration with various power sources.

Output Performance Characteristics

The 21504-00-20-10-02 provides a calibrated range of 80 mils (2.0 mm) . Measurement begins at approximately 10 mils (0.25 mm) from the probe face. Therefore, the system delivers consistent readings across a practical gap range. Scale factor measures 200 mV/mil (7.87 V/mm) with ±4% accuracy when calibrated as a system. Including interchangeability errors, accuracy remains within ±9.5%. Linearity stays within 0.8 mils (0.02 mm) of a 200 mV/mil straight line for system calibration. With interchangeability errors included, linearity reaches within 2.3 mils (0.06 mm).

Frequency response covers 0 to 10 kHz (0 to 600,000 cpm) . At 10 kHz, the response drops by only -5%, which maintains signal integrity at high rotational 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 characteristic enables effective temperature compensation during field operation.

Environmental and Mechanical Limits

The Bently Nevada 21504 system operates reliably under extreme conditions. The Proximitor functions from -60°F to +212°F (-51°C to +100°C). Meanwhile, the probe and extension cable perform from -30°F to +350°F (-34°C to +177°C). This broad range accommodates both cold startups and high-temperature processes. Relative humidity tolerance reaches 95% non-condensing, which prevents moisture-related measurement issues.

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

Installation Guidance

Installing the 21504-00-20-10-02 requires attention to proper mounting procedures. 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 transmission.

Proper gap setting proves critical for accurate measurements. The calibrated range begins at 10 mils from the probe face. Consequently, 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. The 200 mm case length offers ample depth for most standard mounting configurations.

Packaging and Delivery

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

• 1 x 21504 Proximity Transducer System (complete assembly)

• 1 x 8 mm standard probe with attached 1.0m 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 21504-00-20-10-02?
This system provides non-contact vibration and position monitoring for turbomachinery. Typical applications include compressors, turbines, and pumps requiring continuous machine protection.

2. What probe diameter and thread size does this model use?
The 21504-00-20-10-02 features an 8 mm diameter probe with 3/8-24 threads. The standard case configuration fits many existing mounting provisions.

3. What is the overall case length for this model?
Option code 20 specifies a case length of 200 mm. This dimension suits applications requiring deeper probe mounting.

4. 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 calibrated as a complete system.

5. Does this probe include lead armor for cable protection?
No. This model includes no lead armor. This differs from some other 21504 configurations that offer armored cable options for added durability.