Bently Nevada 21504-00-08-05-02 5 mm and 8 mm Standard Mount Probe

Description

21504-00-08-05-02: 7200 series 8 mm standard mount proximity probe, featuring 0.0 in (Option 00) unthreaded length, 0.8 in (Option 08) case length, 0.5 m (Option 05) total cable length, and a miniature male coaxial connector (Option 02). This transducer is part of the 7200 5 mm and 8 mm proximity transducer system, which utilizes the eddy current principle to provide non-contacting displacement measurement between the probe tip and the observed machine surface. The system is designed for shaft vibration and axial position monitoring on critical rotating machinery, including gas turbines, steam turbines, compressors, and pumps. This 8 mm probe configuration is constructed of polyphenylene sulfide (PPS), a plastic capable of withstanding harsh, wet, or chemically active environments. It provides a linear measuring range of 80 mils (2 mm) with a scale factor of 200 mV/mil (7.87 V/mm). Probes are compatible with 7200 series Proximitor sensors and extension cables to complete the transducer loop.

Features

• 8 mm diameter tip construction
• Polyphenylene sulfide (PPS) probe body for chemical resistance
• Standard mount configuration with 3/8-24 threads
• Option 00: 0.0 in unthreaded length
• Option 08: 0.8 in case length
• Option 05: 0.5 m integral cable
• Option 02: Miniature male coaxial connector
• Compatible with 7200 series Proximitor sensors
• Frequency response of 0 Hz to 10 kHz

Applications

• Radial vibration measurements for bearing condition monitoring
• Axial thrust position monitoring to detect bearing wear
• Shaft average radial position (attitude angle) for rotor stability assessment
• Vibration amplitude and phase angle for Polar and Bode diagnostic plots
• Eccentricity measurements for rotor bow detection

Ordering Information

Option	Code on This SKU	Description
Orderable Part Number	21504-00-08-05-02	7200 8 mm Standard Mount Probe
A - Unthreaded Length	00	0.0 in
B - Overall Case Length	08	0.8 in
C - Total Cable Length	05	0.5 m
D - Connector	02	Miniature male coaxial connector

Technical Specifications

Parameter	Specification
Manufacturer	Bently Nevada
Part Number	21504-00-08-05-02
System Type	7200 8 mm Standard Mount
Tip Diameter	8 mm
Case Thread	3/8-24
Linear Range	80 mils (2.0 mm)
Scale Factor	200 mV/mil (7.87 V/mm)
Frequency Response	0 to 10 kHz (-5% at 10 kHz)
Operating Temperature (Probe)	-30 degC to +177 degC
Relative Humidity	To 95%, noncondensing

Installation Guidelines

• Ensure the probe is installed in a secure mounting location to prevent vibration at the probe body.
• Maintain the specified gap from the target surface as per system calibration requirements.
• Use appropriate shielding for the coaxial cable to minimize electrical interference.
• Ensure the coaxial connector (Option 02) is clean and fully tightened during installation.

Compliance and Certifications

• Compatible with API 670 requirements
• System components are often certified by CSA, FM, and BASEEFA for specific hazardous location use (check site-specific installation documentation for current local regulatory compliance).