21504-00-16-05-02 | Bently Nevada 8 mm Probe Proximity Vibration

Introduction to the Bently Nevada 21504-00-16-05-02

When unplanned downtime threatens production targets, the 21504-00-16-05-02 from Bently Nevada provides the accurate vibration data needed to protect rotating assets. This 8 mm probe proximity transducer system is engineered for continuous operation in harsh industrial environments, offering a calibrated range of 80 mils (2.0 mm) that begins at approximately 10 mils (0.25 mm) from the probe face. As part of the 7200 Proximity Transducer Systems family, it delivers consistent performance that helps maintenance teams make informed decisions.

Key Features and Technical Specifications

• Scale Factor: 200 mV/mil (7.87 V/mm) with ±4% accuracy when calibrated as a system, and within ±9.5% including interchangeability errors.
• Linearity: Within 0.8 mils (0.02 mm) of a 200 mV/mil straight line when calibrated as a system; within 2.3 mils (0.06 mm) including interchangeability errors.
• Frequency Response: 0 to 10 kHz (0 to 600,000 cpm), with -5% at 10 kHz (600,000 cpm).
• Temperature Sensitivity: Typically -3% change in scale factor at +150°F (+65°C) at 50 mils gap (1.27 mm).
• Power Requirement: -17.5 Vdc to -26 Vdc at 12 mA maximum consumption.
• Environmental Limits: Proximitor operates from -60°F to +212°F (-51°C to +100°C); probe and extension cable from -30°F to +350°F (-34°C to +177°C); relative humidity up to 95%, noncondensing.
• Corrosion Resistance: For 8 mm probes, operation unaffected by direct contact with air, water, lube oil, ammonium hydroxide, sulfuric acid (10%), MEK, or DMF.
• System Weight: 1.3 lbs (0.59 kg).

One standout feature is the linearity specification: even with interchangeability errors, the deviation remains within 2.3 mils, reducing the need for frequent recalibration and lowering maintenance costs over the equipment lifecycle.

Real-World Applications and Use Cases

In industries such as oil and gas, power generation, and petrochemical processing, the 21504-00-16-05-02 monitors shaft vibration and position in turbines, compressors, and pumps. Its corrosion-resistant construction allows direct exposure to common industrial fluids, minimizing sensor degradation and extending service intervals. For example, a refinery using this probe in a high-temperature compressor train can expect reliable data transmission up to 10 kHz, enabling early detection of bearing faults and reducing the risk of catastrophic failure.

Installation and Setup Guidance

Proper mounting is critical for accurate readings. The 8 mm probe uses a 3/8-24 thread and is available with a 0.5 meter (20 inches) total length option (tolerance: +0.13 m, -0.05 m). Ensure the probe face is positioned within the calibrated range starting at approximately 10 mils (0.25 mm) from the target surface. The miniature male coaxial connector (option 02) provides a secure connection to the Proximitor. Always follow Bently Nevada's mounting guidelines to avoid signal interference and maintain the specified linearity.

Maintenance and Reliability

Regular inspection of the probe and cable for physical damage or contamination helps sustain the 200 mV/mil scale factor accuracy. Given the wide operating temperature range (probe up to +350°F), periodic verification of the system's frequency response ensures consistent performance. By adhering to routine checks, users can maximize the transducer's lifespan and avoid unexpected replacement costs, directly supporting a lower total cost of ownership.

Common Questions About the 21504-00-16-05-02

Q: What is the calibrated range of the 21504-00-16-05-02?

A: The calibrated range is 80 mils (2.0 mm), beginning at approximately 10 mils (0.25 mm) from the probe face.

Q: What power supply does this probe require?

A: It requires -17.5 Vdc to -26 Vdc at 12 mA maximum consumption.

Q: What is the frequency response of the 21504-00-16-05-02?

A: The frequency response is 0 to 10 kHz (0 to 600,000 cpm), with -5% at 10 kHz.

Q: Can the probe operate in corrosive environments?

A: Yes, for 8 mm probes, operation is not affected by direct contact with air, water, lube oil, ammonium hydroxide, sulfuric acid (10%), MEK, or DMF.

Product Support and Availability

The Bently Nevada 21504-00-16-05-02 is available as new and original in factory packing from Petro Auto Tech. Each unit comes with a 12-month factory warranty. Please verify current lifecycle status and availability with Petro Auto Tech before ordering.