21504-00-64-10-02 7200 Proximity Vibration Probe Unit by Bently Nevada

Product Overview & Configuration Breakdown

Manufacturer: Bently Nevada

Model: 21504-00-64-10-02

Series: 7200 Proximity Transducer Systems

Condition: New & Original in Factory Packing

Fulfillment: 24-48 Hour Global Dispatch via FedEx, UPS, and DHL

Warranty: 12-Month Comprehensive Factory Warranty

Configuration Breakdown Tree:

• Model Family: 21504 - 7200 Proximity Transducer System
  • Unthreaded Length: 00 - 0 mm unthreaded portion
  • Overall Case Length: 64 - 6.4 inches total case length
  • Total System Length: 10 - 1.0 meter (39 inches) matched configuration
  • Connector Type: 02 - Miniature male coaxial connector attached

Global PLC Spare HUB's Insight: Legacy 7200-series monitoring architectures require precise impedance matching across transducer loops. The 21504-00-64-10-02 sensor probe ensures stable gap voltage generation for older rack monitors, preventing false machine trips caused by thermal drift or degraded signal attenuation.

Advanced Technical Specifications Table

• Tip Construction: 8 mm diameter profile with standard 3/8-24 mounting threads and no armor
• Input Requirements: -17.5 Vdc to -26 Vdc supply voltage at 12 mA maximum current consumption
• Calibrated Linear Range: 80 mils (2.0 mm) operating span starting approx 10 mils from probe face
• Incremental Scale Factor: 200 mV/mil (7.87 V/mm) nominal output sensitivity
• System Linearity: Within 0.8 mils (0.02 mm) of a straight line under calibrated conditions
• Frequency Response Range: 0 to 10 kHz (0 to 600,000 cpm) with minus 5 percent at top end
• Environmental Tolerance: Proximitor operating from -60°F to +212°F; probe from -30°F to +350°F
• Chemical Resistance: Immune to degradation from direct exposure to water, lube oil, MEK, and DMF
• Total System Weight: Lightweight industrial assembly weighing 1.3 lbs (0.59 kg)

Engineering Selection and Comparative Analysis

When replacing aging vibration sensors on legacy rotating machinery, matching the exact case length and system length codes is critical for maintaining calibration accuracy. For installations requiring a shorter overall case profile, consider the 21504-00-56-05-02 model variant, which features a 5.6-inch case length and a 0.5-meter system length option instead of the 6.4-inch case and 1.0-meter configuration found in the 21504-00-64-10-02. Always verify your rack monitor channel card scaling matches the chosen probe length code.

Industrial Application Scenarios & Diagnostic Capabilities

• Target Machinery: Radial vibration and shaft position monitoring on heavy industrial steam turbines, centrifugal blowers, and large electric motors.
• Diagnostic Function: Tracks microscopic rotor displacements and radial journal bearing clearances in real time.
• Failure Detection: Detects early-stage oil whirl, mechanical unbalance, shaft misalignment, and rub conditions before catastrophic failure occurs.

Frequently Asked Questions

Q: What causes signal distortion when installing the 21504-00-64-10-02 probe?

A: Signal distortion typically occurs if the target diameter is smaller than the recommended minimum size or if the probe threads touch surrounding bulkhead metal, creating a ground loop.

Q: Can this probe be cleaned with chemical solvents during maintenance overhauls?

A: Yes, the PPS tip and stainless steel casing tolerate direct contact with industrial solvents like MEK and DMF, but connectors must be kept dry and free of debris.

Q: How does cable length selection affect the overall voltage output?

A: The system is factory-calibrated as a matched unit for 1.0 meter. Altering extension cable lengths without recalibrating the proximitor will introduce scale factor errors.

Q: What is the proper gap voltage setting procedure during initial commissioning?

A: Adjust the mounting bracket until the static gap voltage reads approximately -10 Vdc, placing the shaft midway within the 80-mil linear range.

Q: Why is there no metal armor on this specific probe tip construction?

A: Unarmored cables provide greater routing flexibility inside tight machinery terminal boxes where external mechanical abrasion hazards are minimal.

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