Bently Nevada 21504-00-52-05-02 Proximity Probe 8mm

Bently Nevada 21504-00-52-05-02 Proximity Probe

Product Introduction

This Bently Nevada 21504-00-52-05-02 vibration probe delivers reliable, non-contact displacement measurement for critical rotating machinery. Specifically, it is a standard-configuration 8 mm probe from the trusted 7200 series. Furthermore, this model features a 5.2-inch overall case length and a 0.5-meter total length with a miniature male coaxial connector. Consequently, it provides a direct, high-integrity signal connection. Above all, this sensor is essential for predictive maintenance and machine protection strategies in power generation, oil and gas, and heavy industry.

Key Technical Specifications

The 21504-00-52-05-02 is engineered for precision and durability. Its core performance metrics ensure accurate data acquisition for your vibration monitoring systems.

• Tip Diameter: 8 mm

• Case Configuration: Standard type with 3/8-24 UNF threads

• Unthreaded Length: 0 mm (Option 00)

• Overall Case Length: 5.2 inches (Option 52)

• Total Length: 0.5 metre (20 inches) with a tolerance of +0.13 m / -0.05 m

• Connector: Miniature male coaxial connector (Option 02)

• Lead Armor: Not included

Electrical Output and Performance

When it comes to performance, the 21504-00-52-05-02 excels in linearity and frequency response. Its calibrated range starts at approximately 10 mils (0.25 mm) from the probe face and extends to 80 mils (2.0 mm). The scale factor is 200 mV/mil (7.87 V/mm), with a system-calibrated accuracy of ±4%. Moreover, the linearity deviation is within 0.8 mils (0.02 mm) when calibrated as a complete system. For applications requiring probe interchangeability, the accuracy remains within ±9.5% and linearity within 2.3 mils (0.06 mm).

Furthermore, the frequency response spans from 0 to 10 kHz (0 to 600,000 cpm), with only a -5% deviation at the upper limit. This wide bandwidth makes it suitable for detecting both low-speed runout and high-frequency blade-pass vibrations. Additionally, its temperature sensitivity is typically -3% change in scale factor at +150°F (+65°C) when measured at a 50-mil gap (1.27 mm).

Power Input and Environmental Limits

Power requirements for this probe are straightforward. It accepts a DC input voltage ranging from -17.5 Vdc to -26 Vdc, with a maximum current consumption of 12 mA. This low power draw ensures compatibility with most existing proximity systems without additional power supply upgrades.

Regarding environmental resilience, the 21504-00-52-05-02 operates across an exceptionally wide temperature range. The Proximitor electronics function between -60°F and +212°F (-51°C to +100°C). Meanwhile, the probe and extension cable withstand temperatures from -30°F to +350°F (-34°C to +177°C). Relative humidity tolerance reaches up to 95%, non-condensing. Moreover, for 8 mm probes specifically, direct contact with air, water, lube oil, ammonium hydroxide, 10% sulfuric acid, MEK, or DMF does not affect probe operation. This chemical resistance greatly enhances its suitability for harsh industrial environments.

Mechanical and Installation Guide

Installing the Bently Nevada 21504-00-52-05-02 requires careful attention to gap settings and threading. First, ensure the target surface is clean and free of debris. Next, thread the probe using the 3/8-24 mounting threads into the provided mounting fixture. Then, connect the miniature male coaxial connector to your extension cable or Proximitor. Finally, set the initial air gap to approximately 10 mils (0.25 mm) to position the probe within its calibrated linear range. For optimal performance, always calibrate the probe, extension cable, and Proximitor as a complete system. This practice minimizes interchangeability errors and ensures the specified linearity of 0.8 mils (0.02 mm).

Packaging List

Your order of the 21504-00-52-05-02 includes the following items in factory-sealed packaging:

• 1 x Bently Nevada 21504-00-52-05-02 Proximity Probe (8 mm tip, 5.2-inch case, 0.5m total length)

• 1 x Miniature male coaxial connector (pre-installed)

• 1 x Factory calibration test report (system-level data)

• 1 x Original Bently Nevada product packaging box

Note: Extension cables, Proximitor drivers, and mounting hardware are not included and must be ordered separately.

Shipping and Logistics

All orders for the 21504-00-52-05-02 ship from our warehouse within 24 hours of order confirmation. We exclusively use premium carriers to ensure safe and timely delivery. Available shipping methods include FedEx, UPS, and DHL. Tracking numbers are provided immediately upon dispatch. Furthermore, international shipments include full customs documentation to minimize clearance delays.

Frequently Asked Questions (FAQ)

Q1: What is the exact calibrated range of the Bently Nevada 21504-00-52-05-02?
A1: Its calibrated range is 80 mils (2.0 mm), beginning at approximately 10 mils (0.25 mm) from the probe face. The linear output is 200 mV/mil over this entire range.

Q2: Can I use this probe with a different brand's extension cable?
A2: For optimal accuracy, we strongly recommend using genuine Bently Nevada extension cables. Interchangeability errors may increase to ±9.5% if third-party cables are used, affecting linearity up to 2.3 mils (0.06 mm).

Q3: What thread size does the probe casing have?
A3: The 21504-00-52-05-02 features a standard 3/8-24 UNF thread, making it compatible with most Bently Nevada mounting fixtures and adapters.

Q4: How does temperature affect the probe's output?
A4: Temperature sensitivity is typically -3% change in scale factor at +150°F (+65°C) when measured at a 50-mil gap. However, the probe and cable operate reliably from -30°F to +350°F (-34°C to +177°C).

Q5: Is this probe suitable for submersible or wet environments?
A5: Yes. The 8 mm tip construction resists direct contact with water, lube oil, and several chemicals like 10% sulfuric acid and MEK. However, ensure the connector remains dry to maintain signal integrity.