21505-12-40-10-02 Bently Nevada Vibration Sensor

Bently Nevada 21505-12-40-10-02 Proximity Probe for Vibration Monitoring

Key Technical Specifications of Model 21505-12-40-10-02

This Bently Nevada 21505-12-40-10-02 probe uses an 8 mm tip diameter. Its calibrated range reaches 80 mils (2.0 mm). The scale factor is 200 mV/mil (7.87 V/mm) with ±4% system accuracy. Linearity stays within 0.8 mils (0.02 mm) when calibrated as a system.

Frequency response goes from 0 to 10 kHz (0 to 600,000 cpm). At 10 kHz, the signal drops by only -5%. Temperature sensitivity changes by -3% at +150°F (+65°C) at a 50 mil gap.

Power requirements are -17.5 Vdc to -26 Vdc with 12 mA max consumption. The output begins at approximately 10 mils from the probe face. For interchangeability, the scale factor tolerance is ±9.5%. Linearity including interchangeability errors stays within 2.3 mils (0.06 mm).

Additionally, the 21505-12-40-10-02 includes a miniature male coaxial connector (option 02). Total length is 1.0 metre (39 inches) with a tolerance of +0.25 m / -0.10 m. The overall case length measures 4.0 inches. The unthreaded length is 120 mm.

Mechanical and Environmental Limits

This probe works reliably in harsh conditions. Operating temperature for the Proximitor is -60°F to +212°F (-51°C to +100°C). For the probe and extension cable, the range is -30°F to +350°F (-34°C to +177°C). Relative humidity can reach 95% non-condensing.

The lead armor uses stainless steel for durability. Thread configuration is 3/8-24. The case is standard type. Moreover, corrosion resistance applies to direct contact with air, water, lube oil, 10% sulfuric acid, MEK, or DMF.

System weight is only 1.3 lbs (0.59 kg). This lightweight design simplifies installation.

Installation Guidelines for the 7200 Series Probe

First, confirm the target surface is clean and conductive. Next, thread the Bently Nevada 21505-12-40-10-02 into the mounting hole using the 3/8-24 threads. Then, connect the miniature male coaxial connector securely.

For best results, use the recommended gap voltage range. The linear range starts at about 10 mils from the probe face. Therefore, set the initial gap between 10 and 90 mils for optimal performance.

Finally, tighten the probe without over-torquing. Use a gap meter to verify the output voltage. This ensures the vibration monitoring system reads correctly.

Why Choose the 21505-12-40-10-02 Variant

The 120 mm unthreaded length gives you more installation flexibility. This works well when you need deeper mounting holes or extra clearance. Meanwhile, the 4.0 inch case keeps the overall assembly compact.

Furthermore, this probe shares the same electrical performance as other 21505 models. You get consistent 200 mV/mil output and 0-10 kHz response. Therefore, swapping to this variant does not require system recalibration.

Packaging List

• 1 x Bently Nevada 21505-12-40-10-02 proximity probe

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

• 1 x Factory packing box with anti-static foam

Shipping Information

We ship via FedEx, UPS, or DHL. Delivery takes 3–7 business days depending on your location.

Frequently Asked Questions (FAQ)

1. What machines use the 21505-12-40-10-02?
This Bently Nevada 21505-12-40-10-02 monitors vibration in turbines, compressors, pumps, and fans. It suits critical rotating machinery.

2. How is this different from the 21505-00-52-10-02?
The key difference is the unthreaded length. This model has 120 mm unthreaded length and a 4.0 inch case. The other has 0 mm unthreaded and a 5.2 inch case.

3. Can I use this probe with existing 7200 series Proximitors?
Yes. The 21505-12-40-10-02 is part of the 7200 series. It works directly with matching Proximitor sensors.

4. Does the probe resist chemical exposure?
Absolutely. This 8 mm probe resists water, lube oil, 10% sulfuric acid, MEK, and DMF. Operation remains unaffected by direct contact.

5. What is the cable length tolerance?
Total length tolerance is +0.25 metre (10 inches) and -0.10 metre (-4 inches) from the 1.0 metre nominal length.