Bently Nevada 21504-004-016-10-02 Proximity Probe

Bently Nevada 21504-004-016-10-02 Proximity Probe for Vibration Monitoring

Product Introduction

The Bently Nevada 21504-004-016-10-02 is a precision proximity probe from the trusted 7200 series. This sensor measures shaft vibration and axial position in rotating machinery. Many plants choose Bently Nevada for critical asset protection. The 21504-004-016-10-02 offers a calibrated range of 80 mils (2.0 mm). Its scale factor sits at 200 mV/mil with ±4% system accuracy.

You can use this probe with turbines, compressors, pumps, and fans. Furthermore, the frequency response reaches from 0 to 10 kHz (0 to 600,000 cpm). Therefore, it captures both slow shaft movement and high-speed vibration. The tip diameter is 8 mm, and the threads are 3/8-24. This configuration fits standard mounting holes.

Technical Specifications

Input Power: The device needs -17.5 Vdc to -26 Vdc at 12 mA maximum consumption.
Output Range: Calibrated range begins at approximately 10 mils (0.25 mm) from the probe face.
Scale Factor: Standard factor is 200 mV/mil (7.87 V/mm). System calibration achieves ±4% accuracy. Interchangeability errors stay within ±9.5%.
Linearity: System calibration keeps linearity within 0.8 mils (0.02 mm) of the straight line. Including interchangeability, the limit extends to 2.3 mils (0.06 mm).
Frequency Response: The sensor works from 0 to 10 kHz. At 10 kHz, response drops by only -5%.
Temperature Sensitivity: At +150°F (+65°C) and 50 mils gap, the scale factor changes by approximately -3%.

Environmental and Mechanical Limits

Operating Temperature for Proximitor: -60°F to +212°F (-51°C to +100°C).
Probe and Extension Cable: They withstand -30°F to +350°F (-34°C to +177°C).
Relative Humidity: The system tolerates up to 95% noncondensing conditions.
Corrosion Resistance for 8 mm Probes: Direct contact with air, water, lube oil, ammonium hydroxide, 10% sulfuric acid, MEK, or DMF does not affect operation.

Tip Construction Details

• Part number: 21504

• Diameter: 8 mm

• Case: Standard

• Threads: 3/8-24

• Lead armor: No

Ordering Information Breakdown

• Unthreaded length option 004 = 40 mm

• Overall case length option 016 = 1.6 inches

• Total length option 10 = 1.0 metre (39 inches). Tolerance: +0.25 metre, -0.10 metre

• Connector option 02 = Miniature male coaxial connector

Installation Guidelines

First, clean the mounting surface and probe tip before installation. Next, screw the 21504-004-016-10-02 into the mounting hole using the 3/8-24 thread. Do not overtighten, as this can damage the tip. Meanwhile, maintain the recommended gap of approximately 10 mils (0.25 mm) from the target surface.

Additionally, use the correct extension cable and Proximitor for system calibration. The total system weight is only 1.3 lbs (0.59 kg), so handling is easy. For best results, check the gap voltage after installation. Finally, secure the coaxial connector to avoid signal noise.

Packaging List

• One Bently Nevada 21504-004-016-10-02 proximity probe

• Factory original packing with anti-static protection

• No mounting accessories or cables included

Note: The extension cable and Proximitor driver are sold separately.

Shipping Information

We ship all orders via Fedex, UPS, or DHL. Delivery times depend on your location. Tracking numbers are provided after dispatch.

Frequently Asked Questions (FAQ)

1. Can I use the Bently Nevada 21504-004-016-10-02 in a high-humidity environment?
Yes, it operates at up to 95% relative humidity, noncondensing. Moreover, the probe resists many corrosive substances like water and lube oil.

2. What is the difference between system calibration and interchangeability calibration?
System calibration gives ±4% scale factor accuracy. Interchangeability calibration allows probe replacement without full system recalibration, though accuracy becomes ±9.5%.

3. How long is the total cable length for model 21504-004-016-10-02?
The total length is 1.0 metre (39 inches) with a tolerance of +0.25 metre and -0.10 metre. The connector is a miniature male coaxial type.

4. Does this probe work with older Bently Nevada monitors?
Yes, the 21504-004-016-10-02 is part of the 7200 series and works with compatible Bently Nevada Proximitor systems. Check your monitor’s input specifications before use.

5. How do I clean the probe tip before installation?
Use a soft, lint-free cloth with isopropyl alcohol. Avoid abrasive materials or strong solvents that could damage the tip surface.