Bently Nevada 21505-00-72-10-02 Proximity Probe Specs

The Bently Nevada 21505-00-72-10-02 is an 8 mm proximity probe from the 21505 series. It measures radial shaft displacement on rotating machinery with high accuracy. Plants specify this probe for turbines, compressors, and large motors. Consequently, it supports continuous protection and condition monitoring programs.

Key Technical Specifications

Parameter	Specification
Model	Bently Nevada 21505-00-72-10-02
Category	Proximity Probe
Probe Tip Diameter	8 mm
Total Length	72 inches (1.83 m)
Connector Style	10-02 coaxial connector
Weight	Approximately 340 g
Linear Range	2 mm (80 mils)
Sensitivity	7.87 mV/µm (200 mV/mil)
Frequency Response	0 to 10 kHz
Operating Temperature	-35 °C to +177 °C
Output Impedance	50 Ω nominal
Housing Material	316L stainless steel

Component Structure and Interface

Each assembly contains a probe tip, extension cable, and coaxial connector. The 21505-00-72-10-02 pairs with a 10-02 driver for signal demodulation. Moreover, the stainless steel body resists corrosion and mechanical wear. The shielded cable minimizes electrical noise from nearby drives and motors.

Power and Signal Conditioning

This probe holds no internal energy storage components. Instead, it depends on an external proximity driver for excitation. The driver supplies -24 VDC and processes the returned signal. As a result, the system outputs voltage proportional to shaft position.

Mounting and Calibration Notes

Technicians mount the probe through a threaded hole or bracket. Target material selection matters, because different alloys alter sensitivity readings. Therefore, always confirm calibration against the actual shaft alloy. Additionally, keep cable runs short to limit signal attenuation.