Bently Nevada 21504-00-16-05-02 7200 Proximity Probe

Bently Nevada 7200 Probe 21504-00-16-05-02

The Bently Nevada 21504-00-16-05-02 is a precision-engineered proximity probe designed for critical machinery monitoring. This sensor operates on the eddy current principle to measure static and dynamic displacement without contacting the target. It is a core component of the 7200 Proximity Transducer System. The Bently Nevada 7200 probe is commonly used for radial vibration and axial position measurements on turbines, compressors, pumps, and electric motors. Furthermore, this model offers a robust 8 mm diameter tip with standard 3/8-24 mounting threads. Specifically, the 21504-00-16-05-02 provides reliable data for predictive maintenance and machine protection strategies.

Key Technical Specifications and Performance 21504-00-16-05-02

The Bently Nevada 21504-00-16-05-02 delivers a calibrated range of 80 mils (2.0 mm), beginning at approximately 10 mils (0.25 mm) from the probe face. Its scale factor is 200 mV/mil (7.87 V/mm) with a system accuracy of ±4%. Moreover, the frequency response extends from 0 to 10 kHz, capturing both static and dynamic events. Linearity is within 0.8 mils (0.02 mm) when calibrated as a complete system. This sensor requires a power input of -17.5 Vdc to -26 Vdc with a maximum consumption of 12 mA. The scale factor tolerance expands to ±9.5% when accounting for interchangeability errors across different probe and Proximitor combinations.

Mechanical Configuration and Part Number Breakdown 21504-00-16-05-02

The part number 21504-00-16-05-02 defines the exact mechanical specifications:

• 21504: Base model for an 8 mm standard mount probe with no armor and 3/8-24 threads.

• 00: Unthreaded length of 0 mm, meaning a flush mount configuration.

• 16: Overall case length of 160 mm.

• 05: Total integral cable length of 0.5 meters (20 inches). The tolerance is +0.13 meters, -0.05 meters (+5 inches, -2 inches).

• 02: Termination with a miniature male coaxial connector.

The Bently Nevada 7200 probe construction uses polyphenylene sulfide (PPS) for the 8 mm tip, ensuring durability in harsh environments. The lead armor option "No" means this probe uses a standard unarmored cable.

Frequency Response and Temperature Sensitivity 21504-00-16-05-02

The frequency response of this Bently Nevada 21504-00-16-05-02 ranges from 0 Hz (static) to 10 kHz (600,000 cpm). At the 10 kHz limit, the signal attenuation is -5%. The temperature sensitivity is typically -396 change in scale factor at +150°F (+65°C) at a 50 mils gap (1.27 mm). This means the output varies slightly with temperature, so system calibration should account for the operating environment.

Environmental Limits and Chemical Resistance

The Bently Nevada 21504-00-16-05-02 operates reliably under extreme conditions. For instance, the probe and extension cable function from -30°F to +350°F (-34°C to +177°C). Meanwhile, the Proximitor operates from -60°F to +212°F (-51°C to +100°C). The relative humidity tolerance is up to 95% non-condensing. Additionally, the 8 mm probe resists direct contact with air, water, lube oil, ammonium hydroxide, 10% sulfuric acid, MEK, and DMF. This chemical resistance makes it suitable for petrochemical, oil and gas, and power generation applications.

Installation and Mounting Guidelines

First, mount the Bently Nevada 21504-00-16-05-02 using its 3/8-24 UNF threads. Ensure the target material is compatible, as calibration is typically performed on AISI 4140 steel. Next, set the initial gap to 10 mils (0.25 mm) to begin the linear range. Then, secure the probe and connect the miniature coaxial connector to your Proximitor. Finally, verify the system output and perform a calibration check. The unthreaded length option "00" allows for a flush installation without a protruding tip.

Packaging and Shipping

The Bently Nevada 21504-00-16-05-02 is packaged in a factory-sealed anti-static bag.
It is then placed in a durable, foam-lined industrial shipping carton.
Shipment includes the sensor with its integral 0.5m cable and coaxial connector.
All products are shipped using premium carriers: FedEx, UPS, or DHL.

Frequently Asked Questions (FAQ)

Q: What is the linear measurement range of the 21504-00-16-05-02?
A: This Bently Nevada 7200 probe offers a linear calibrated range of 80 mils (2.0 mm). The measurement begins at approximately 10 mils (0.25 mm) from the probe face.

Q: Can I use this probe in a high-humidity or chemically harsh environment?
A: Yes. The 8 mm probe is rated for up to 95% non-condensing humidity. It also resists corrosion from oil, water, 10% sulfuric acid, MEK, and DMF.

Q: What is the frequency response for the Bently Nevada 21504-00-16-05-02?
A: The frequency response is from 0 Hz (static) to 10 kHz (600,000 cpm). At 10 kHz, there is a -5% attenuation.

Q: Does the 21504-00-16-05-02 include an extension cable?
A: No, this model features an integral 0.5-meter cable with a miniature male coaxial connector. You can connect it directly to a Proximitor or use an extension cable for longer distances.

Q: What is the difference between the 21504 and the 3300 XL series probes?
A: The 21504-00-16-05-02 is an 8 mm probe from the 7200 series. The 3300 XL equivalent is the 330103 series, which uses a different connector and cable system. The 7200 series is an older generation but remains widely used in installed systems.