Bently Nevada

Bently Nevada 21508-02-12-05-02 8 mm Reverse Mount Probe

SKU 21508-02-12-05-02

In stock
  • 12-month warranty
  • Free returns within 30 days
  • Manufacturer: Bently Nevada

  • Product No.: 21508-02-12-05-02

  • Country of origin:United States

  • Product Type: 5 mm and 8 mm Standard Mount Probe

  • Barcode: 8537101190

  • Payment: T/T, Western Union

  • Weight: 550g

  • Dimensions: 20.5cm x 22.4cm x 3.3cm

  • Shipping port: Xiamen

  • Warranty: 12 months

Description

The 21508-02-12-05-02 is a 7200 series 8 mm reverse mount proximity probe, featuring a 0.2 inch unthreaded length (Option 02) and a 1.2 inch case length (Option 12). This configuration includes a 0.5 metre total cable length (Option 05) and is terminated with a miniature male coaxial connector (Option 02).

Used as a critical component in 7200 series transducer systems, this probe utilizes the eddy-current principle to provide non-contacting vibration and position measurements. The probe is engineered for reverse mount installation on rotating machinery, such as steam turbines, gas compressors, and large electric motors. It pairs with 7200 series Proximitor sensors and extension cables to monitor radial vibration, axial thrust position, and shaft average radial position.

Features

  • 8 mm probe tip diameter for high-accuracy displacement measurement
  • Reverse mount configuration with 3/8-24 UNF threads
  • 0.2 inch unthreaded length and 1.2 inch case length
  • 0.5 metre integral coaxial cable for compact installation
  • Miniature male coaxial connector for signal transmission
  • Compatible with Bently Nevada 7200 series Proximitor sensors and monitoring systems
  • Constructed of polyphenylene sulfide (PPS) for chemical resistance

Applications

  • Radial vibration monitoring to detect rotor imbalance and misalignment
  • Axial thrust position measurements to monitor bearing wear
  • Shaft average radial position for rotor stability analysis
  • Eccentricity measurement to identify rotor bow
  • Installation in steam turbines, gas compressors, pumps, and electric motors

Ordering Information

Option Code Description
Orderable Part Number 21508-02-12-05-02 8 mm Reverse Mount Probe, 3/8-24 UNF
A - Unthreaded Length 02 0.2 inches
B - Case Length 12 1.2 inches
C - Total Cable Length 05 0.5 metre
D - Connector 02 Miniature male coaxial connector

Technical Specifications

Manufacturer Bently Nevada
Part Number 21508-02-12-05-02
Probe Diameter 8 mm
Mounting Type Reverse Mount
Thread Size 3/8-24 UNF-2A
Case Material Polyphenylene sulfide (PPS)
Cable Length 0.5 metre
Connector Type Miniature male coaxial
Linear Measuring Range 80 mils (2.0 mm)
Scale Factor 200 mV/mil (7.87 V/mm)
Operating Temperature -34 degC to +177 degC
Frequency Response 0 to 10 kHz

Installation Guidelines

Ensure the probe is installed with the correct gap distance to maintain the linear range of 80 mils (2.0 mm). Use caution when tightening the mounting nut to avoid damage to the PPS probe body. Proper grounding of the coaxial cable shield is required to prevent electrical interference. For hazardous locations, verify the installation against local safety codes and specific Bently Nevada hazardous area data sheets.

FAQ

What does the 02 option in the unthreaded length segment mean for this probe?

In the 21508-02-12-05-02 model, the 02 code indicates an unthreaded length of 0.2 inches.

Is this probe compatible with standard 7200 series Proximitor sensors?

Yes, this 8 mm reverse mount probe is fully compatible with standard 7200 series Proximitor sensors and extension cables.

What is the primary application for a reverse mount probe?

Reverse mount probes are typically installed through the machine case, where the probe body is mounted from the inside or through a specific mounting bracket configuration, commonly used on large rotating machinery like turbines and compressors.

Does this probe include an armored cable?

No, the 21508-02-12-05-02 configuration specifies a standard coaxial cable without stainless steel armor.

View all FAQs →

Product Documentation

Technical Datasheet (PDF) Complete specifications and technical drawings.

Technical Datasheet

Bently Nevada 21508-02-12-05-02 8 mm Reverse Mount Probe

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Global Express Shipping

  • Standard Delivery: 4-6 Business Days via DHL, FedEx, and UPS.
  • Express Dispatch: Same-day dispatch for in-stock orders placed before 2:00 PM (GMT+8).
  • Worldwide Coverage: Serving over 150 countries, including rapid delivery to Saudi Arabia and UAE.

Returns & Warranty

  • 30-Day Guarantee: Returns accepted for in-stock products in original, factory-sealed packaging.
  • 12-Month Warranty: Every industrial component is backed by our professional technical warranty.

Orders are processed and delivered Monday-Friday (excluding public holidays).


For full eligibility, restocking fees, and international return details, please view our official Refund & Return Policy .

TECHNICAL SPECIFICATIONS

Country of origin
United States

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