Bently Nevada 21505-04-48-10-02 Probe Proximity Vibration
21505-04-48-10-02 Product Introduction
The 21505-04-48-10-02 belongs to Bently Nevada’s 7200 series proximity transducer systems. This model measures vibration and position in rotating machinery. It includes an 8 mm probe tip, a 40 mm unthreaded length, and a 4.8-inch overall case length. The total length is 1.0 meter with a miniature male coaxial connector. Manufactured with stainless steel lead armor, this probe resists harsh environments. Many plants use it for shaft vibration monitoring on turbines, compressors, and pumps.
21505-04-48-10-02 Technical Specifications
The 21505-04-48-10-02 operates with a power supply of -17.5 Vdc to -26 Vdc at 12 mA maximum consumption.
Key range parameter: Calibrated range is 80 mils (2.0 mm), starting approximately 10 mils from the probe face.
Key output parameter: Scale factor measures 200 mV/mil (7.87 V/mm) with ±4% accuracy when calibrated as a system. Including interchangeability errors, accuracy stays within ±9.5%.
Linearity performance is strong. Within a system calibration, deviation is within 0.8 mils (0.02 mm) of a straight line. Including probe interchangeability, it stays within 2.3 mils (0.06 mm). Frequency response ranges from 0 to 10 kHz (0 to 600,000 cpm), with only -5% at 10 kHz.
Temperature sensitivity is typically -3% change in scale factor at +150°F (+65°C) at a 50 mil gap. This ensures reliable readings even when thermal shifts occur.
Mechanical and Environmental Limits
The proximity probe operates in extreme conditions. The Proximitor electronics work from -60°F to +212°F (-51°C to +100°C). Meanwhile, the probe and extension cable handle -30°F to +350°F (-34°C to +177°C). Relative humidity can reach 95% non-condensing without affecting performance.
Corrosion resistance applies specifically to this 8 mm probe. Direct contact with air, water, lube oil, ammonium hydroxide, 10% sulfuric acid, MEK, or DMF does not disturb probe operation. Therefore, the 21505-04-48-10-02 suits chemical plants and offshore environments.
Installation Guidelines
Before installation, verify the total length is 1.0 metre with tolerance of +0.25 metre / -0.10 metre. Use the 3/8-24 threaded configuration for mounting. The stainless steel lead armor protects the cable from abrasion and mechanical stress.
Ensure the target surface is clean and has proper finish. The gap should begin at approximately 10 mils from the probe face. Connect the miniature male coaxial connector securely to the Proximitor. Power the system with -24 Vdc typical for best linearity. Always calibrate the 21505-04-48-10-02 as a system with the matching Proximitor for optimal accuracy.
Packaging List
1 x Bently Nevada 21505-04-48-10-02 Proximity Probe
1 x Miniature male coaxial connector (pre-attached)
1 x Factory packing box with foam protection
*Note: No certificate or warranty document is included in the package. The 12-month factory warranty is managed separately.*
Shipping Information
We ship this proximity probe via FedEx, UPS, or DHL. Orders are processed within 24 hours. Tracking number provided after dispatch.
Frequently Asked Questions (FAQ)
1. Which machines use the 21505-04-48-10-02 probe?
This probe monitors vibration on turbines, compressors, fans, pumps, and generators. It works well in any rotating machinery where shaft relative vibration measurement is required.
2. Can I extend the cable length of the 21505-04-48-10-02?
No. The total length is fixed at 1.0 metre. For longer runs, use a separate extension cable designed for Bently Nevada 7200 systems.
3. What happens if I use a different power supply voltage?
The probe requires -17.5 Vdc to -26 Vdc. Using higher or lower voltages may cause scale factor errors or damage the Proximitor. Always stay within the specified range.
4. Is this 8 mm probe compatible with older Bently Nevada monitors?
Yes. The 21505-04-48-10-02 works with most 7200 series Proximitors and 3500 monitoring systems. However, verify your system’s input specifications before connection.
5. How do I clean the probe tip safely?
Use a soft cloth with isopropyl alcohol. Avoid scratching the probe face. Do not use abrasive materials or strong solvents like acetone.
