Description

Bently Nevada 21500-00-12-10-02 7200 Series Proximity Probe

The Bently Nevada 21500-00-12-10-02, also cataloged as the 21500 proximity probe, operates as a dedicated hardware component for non-contacting displacement and vibration measurement within the 7200 Series proximity transducer system.

Suffix Breakdown & Model Matrix

Code Segment	Description
21500	7200 Series 5 mm Proximity Probe (1/4-28 UNF thread)
00	Unthreaded Length: 0.0 in
12	Overall Case Length: 1.2 in
10	Integral Cable Length: 1.0 m
02	Connector Option: Miniature Male Coaxial Connector

Hardware Specifications

Parameter	Specification
Model	21500-00-12-10-02
Brand	Bently Nevada
Origin	United States
Weight	Approx. 0.15 kg (with cable and connector)
Dimensions	5 mm Tip Dia., 1.2 in Case Length, 1.0 m Cable
Operating Temp	-51 deg C to +177 deg C (Probe Tip/Cable)
Power Consumption	Supplied via Proximitor (requires external power source)
Probe Tip Diameter	5 mm
Linear Range	80 mils (2.0 mm) nominal
Scale Factor	200 mV/mil (7.87 V/mm) on AISI 4140 steel
Frequency Response	0 Hz (DC) to 10 kHz
Thread Type	1/4-28 UNF

Eddy-Current Probe Scaling and Gap Voltage Validation

Probe performance is dependent on target material composition and probe-to-target gap. Calibration against AISI 4140 steel establishes the standard scale factor; deviations occur with alternate alloys. Gap voltage must be validated during installation to ensure operation within the linear range, typically targeting -10 VDC at mid-scale for optimal dynamic signal resolution. Eddy-current field interaction requires a minimum clearance of 1 inch (25.4 mm) from adjacent metallic structures to prevent cross-talk suppression degradation.

Frequently Asked Questions

Q: Is the 21500 probe compatible with the 3300 XL Proximitor?

A: No. The 21500 probe is electrically matched to the 7200 Series Proximitor. Attempting to pair it with a 3300 XL Proximitor will result in incorrect scale factor output and potential linear range errors.

Q: What is the minimum target surface finish requirement for accurate measurement?

A: A surface finish of 32 micro-inches (Ra) or smoother is recommended to minimize eddy-current signal noise and ensure measurement stability.

Field Installation Guidelines

Install the probe using the 1/4-28 UNF thread, ensuring at least 5 full thread engagements for mechanical stability. Do not over-tighten. Route the integral coaxial cable away from high-voltage power conductors and switching devices to prevent electromagnetic interference. Maintain continuous shield grounding at the termination point to the monitoring system chassis. Verify probe tip cleanliness prior to energizing the system.

Specifications

• Brand: Bently Nevada

Advantages

• High reliability in industrial environments
• Supports continuous operation
• Compatible with major PLC/DCS systems