21504-00-56-05-02 Bently Nevada 7200 Series Proximity Vibration Probe

Product Overview

The Bently Nevada 21504-00-56-05-02 is a high-performance proximity vibration probe belonging to the trusted 7200 Series. Engineers utilize this transducer system to measure dynamic and static shaft position, vibration, and speed in critical industrial machinery. Global PLC Spare HUB's Insight reveals that precise mechanical alignment heavily relies on this specific sensor architecture to prevent catastrophic turbomachinery failures.

Technical Specifications

• Brand: Bently Nevada
• Model / Part Number: 21504-00-56-05-02
• Series: 7200 Series
• Calibrated Range: 80 mils (2.0 mm), starting approximately 10 mils (0.25 mm) from probe face
• Scale Factor: 200 mV/mil (7.87 V/mm), ±4% system calibrated
• Linearity: Within 0.8 mils (0.02 mm) of a 200 mV/mil straight line
• Frequency Response: 0 to 10 kHz (0 to 600,000 cpm); -5% at 10 kHz
• Temperature Sensitivity: Typically -3% change in scale factor at +150°F (+65°C)
• Operating Temperature (Proximitor): -60°F to +212°F (-51°C to +100°C)
• Operating Temperature (Probe & Cable): -30°F to +350°F (-34°C to +177°C)
• System Weight: 1.3 lbs (0.59 kg)

Installation Guide

Technicians mount the probe using standard 3/8-24 threads into machinery housings. Ensure proper gap voltage adjustment during initial setup, typically targeting -10 Vdc center voltage for optimal linear operation. Field experience dictates that shielding the coaxial cable away from high-voltage motor leads eliminates electrical noise interference entirely.

Commissioning and Maintenance Convenience

Engineers verify system health by checking the dc gap voltage using a digital multimeter at the proximitor terminals. The miniature male coaxial connector allows fast disconnection during routine maintenance. Global PLC Spare HUB's Insight highlights that regular calibration checks every six months preserve measurement accuracy in harsh environments.

Compatibility and System Integration

This transducer integrates seamlessly with standard 7200 Series monitoring racks and power supplies. The unthreaded length option 00 and overall case length option 56 ensure direct mechanical replacement in existing industrial setups without structural modifications.

Environmental Tolerance and Corrosion Resistance

The probe withstands exposure to industrial fluids including air, water, lube oil, ammonium hydroxide, sulfuric acid (10%), MEK, and DMF. Relative humidity tolerance reaches up to 95% noncondensing, ensuring reliable performance in humid turbine enclosures.

Typical Applications and Diagnostic Capabilities

Operators deploy the 21504-00-56-05-02 in steam turbines, centrifugal compressors, and large industrial pumps. The sensor detects radial vibration, axial thrust position, and eccentric shaft rotation, providing early fault detection for bearing wear and rotor unbalance.

Package Contents and Logistics

• 1 x New & Original Bently Nevada 21504-00-56-05-02 Probe in Factory Packing
• 12 Months Factory Warranty Documentation
• Express Shipping via FedEx, UPS, and DHL
• Processing Time: 24 to 48 hours

Buying Guide

When selecting a proximity probe for turbomachinery, verify your existing thread size, case length, and cable length requirements. Always match the probe model with compatible 7200 Series proximitors to maintain system linearity and avoid signal distortion.

Frequently Asked Questions

What is the standard gap voltage for the 7200 series probe system during installation?

The target initial gap voltage is typically -10 Vdc, which positions the probe in the middle of its 80 mil linear operating range.

Can I use extension cables of a different length with model 21504-00-56-05-02?

No, system calibration relies on specific electrical lengths. Changing cable lengths alters the scale factor and requires complete system recalibration.

How does oil contamination affect probe performance?

Standard probe construction resists direct contact with industrial lube oils, meaning occasional oil splash does not degrade signal output or damage the tip.

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