21504-000-016-10-02 Bently Nevada 8mm Vibration Sensor

Bently Nevada 21504-000-016-10-02 Proximity Probe for Rotating Machinery Monitoring

Product Introduction

The Bently Nevada 21504-000-016-10-02 is a specialized proximity probe from the 7200 series. Unlike standard versions, this model uses a 000 unthreaded length option, meaning 0 mm of unthreaded tip. This design provides the maximum active sensing area close to the mounting surface. Many maintenance teams prefer Bently Nevada for critical vibration monitoring applications.

The 21504-000-016-10-02 measures shaft vibration, axial position, and eccentricity. Its calibrated range reaches 80 mils (2.0 mm), starting from approximately 10 mils (0.25 mm) off the probe face. Therefore, you get reliable data even at very close gaps. Furthermore, the frequency response spans 0 to 10 kHz (0 to 600,000 cpm), capturing both low-speed runout and high-frequency vibration events.

Technical Specifications

Input Power Requirements: The system needs -17.5 Vdc to -26 Vdc at 12 mA maximum consumption.

Output Calibration: Calibrated range is 80 mils (2.0 mm). Measurement begins at roughly 10 mils (0.25 mm) from the probe face.

Scale Factor Accuracy: Standard output is 200 mV/mil (7.87 V/mm). System calibration delivers ±4% accuracy measured in 10 mil increments. When you include interchangeability errors, accuracy stays within ±9.5%.

Linearity Performance: System calibration keeps linearity within 0.8 mils (0.02 mm) of the 200 mV/mil straight line. Including probe interchangeability, the deviation extends to 2.3 mils (0.06 mm).

Frequency Response Range: The sensor responds from 0 to 10 kHz (0 to 600,000 cpm). At the maximum 10 kHz point, response drops by only -5%.

Temperature Sensitivity: At +150°F (+65°C) with a 50 mils gap (1.27 mm), the scale factor changes by approximately -3%.

Mechanical and Environmental Limits

Operating Temperatures:

• Proximitor: -60°F to +212°F (-51°C to +100°C)

• Probe and extension cable: -30°F to +350°F (-34°C to +177°C)

Humidity Tolerance: The system handles up to 95% relative humidity, noncondensing.

Corrosion Resistance for 8 mm Probes: Direct contact with air, water, lube oil, ammonium hydroxide, 10% sulfuric acid, MEK (methyl-ethyl ketone), or DMF (dimethylformamide) does not affect operation.

Tip Construction and Ordering Breakdown

Tip Construction Details for 21504-000-016-10-02

• Part number base: 21504

• Diameter: 8 mm

• Case type: Standard

• Thread configuration: 3/8-24

• Lead armor: No

How to Read Your Ordering Code

• Unthreaded length option 000 = 0 mm (full threads to tip end)

• 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, inspect the mounting hole threads to ensure they match the 3/8-24 specification. Next, thread the Bently Nevada 21504-000-016-10-02 carefully into position. Because this probe has 0 mm unthreaded length, the tip face sits very close to the mounting surface. Do not let the tip touch the target shaft.

Meanwhile, set the initial gap to approximately 10 mils (0.25 mm) from the shaft surface. Use a precision gap tool or monitor the output voltage. Additionally, secure the miniature male coaxial connector to prevent signal noise. The total system weight is only 1.3 lbs (0.59 kg), so handling remains simple. Finally, verify the gap voltage before running the machine at full speed.

Packaging List

• One Bently Nevada 21504-000-016-10-02 proximity probe

• Factory original anti-static packaging

• No mounting hardware, cables, or Proximitor included

Note: Extension cables and the Proximitor driver must be ordered separately.

Shipping Information

All orders ship via Fedex, UPS, or DHL. Tracking numbers are provided within 24 hours of dispatch.

Frequently Asked Questions (FAQ)

1. What does the 000 unthreaded length mean on this Bently Nevada probe?
The 000 option means 0 mm of unthreaded length between the threads and the probe tip. The threads extend all the way to the tip face, maximizing the active sensing area near the mounting surface.

2. Can the 21504-000-016-10-02 replace a probe with a longer unthreaded section?
Not directly. You must check your mechanical mounting setup first. A 0 mm unthreaded probe sits deeper into the mounting hole. Therefore, your gap and clearance will change. Always verify the target distance before permanent installation.

3. How does temperature affect the 21504-000-016-10-02 scale factor?
At +150°F (+65°C) with a 50 mils gap, the scale factor changes by approximately -3%. For most industrial applications, this shift remains acceptable. However, you should recalibrate if operating near temperature extremes.

4. Is this probe compatible with older Bently Nevada 7200 series monitors?
Yes, the 21504-000-016-10-02 belongs to the 7200 series family. It works with matching Bently Nevada Proximitor drivers and extension cables. Check your existing system's input range before connecting.

5. What happens if the probe tip contacts the shaft during operation?
Tip contact can damage the probe face and corrupt your vibration data. In severe cases, it may cause a machine trip or shutdown. Always maintain the recommended 10 mil minimum gap and verify with a gap meter after installation.