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        Bently Nevada 21504-000-020-05-02
        Bently Nevada 21504-000-020-05-02
        Bently Nevada 21504-000-020-05-02
        Bently Nevada 21504-000-020-05-02
        Bently Nevada 21504-000-020-05-02
        Bently Nevada 21504-000-020-05-02
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        21504-000-020-05-02

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        The 21504-000-020-05-02 is an 8 mm standard proximity probe with 3/8-24 UNF threads, 80 mils (2 mm) linear range, 200 mV/mil (7.87 V/mm) scale factor, and 0-10 kHz frequency response for non-contact shaft vibration and position monitoring.
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        Warranty Policy
        We provide 1 year warranty for all remaining parts.
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        Return Notice
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        In the event of a defect, we will send new equipment, repair equipment or refund the purchase price based on our availability. You must contact us to obtain a return authorization and return the defective device to us within 14 days of reporting the defect.
        Shipping Mode
        Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.
        Parts Availability
        Apter Power offers a wide range of components, products and services related to industrial automation. We also supply new products from a variety of quality manufacturers.
        How to order
        We have been working hard to update our inventory. If we have stock or parts available for new factory purchases, you can contact the order online. If we do not currently have an inventory, the displayed quantity will show "Ask". Please create an online quote or contact us by phone, fax or email to check availability.

        Technical specifications for 21504-000-020-05-02

        • Manufacturer:
          Bently Nevada
        • Part Number:
          21504-000-020-05-02
        • Product Family:
          7200 Proximity Transducer Systems
        • Probe Diameter:
          8 mm
        • Thread Type:
          3/8-24 UNF
        • Tip Material:
          Polyphenylene sulfide (PPS)
        • Linear Range:
          80 mils (2.0 mm)
        • Scale Factor:
          200 mV/mil (7.87 V/mm)
        • Frequency Response:
          0 to 10 kHz
        • Operating Temperature:
          -30°F to +350°F (-34°C to +177°C)
        • Power Supply:
          -17.5 Vdc to -26 Vdc, 12 mA max
        • Key Benefit:
          Solves the challenge of accurate shaft measurement in harsh environments with chemical-resistant PPS tip, wide temperature range, and complete system interchangeability—eliminates bench calibration.
        • Weight:
          0.05 kg
        • Estimated shipping dimensions:
          1.6x1.3x69cm
        • Tariff Code:
          8479899990
        • Country of origin:
          USA
        • Place of shipment:
          Xiamen, Fujian, China
        By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

        More Information

        Overview Manuals Specifications Applications Updates Configuration & Programming

        Features:

        • 80 mils (2 mm) linear range with 200 mV/mil (7.87 V/mm) scale factor provides precise non-contact displacement measurement for shaft position and vibration.
        • PPS (polyphenylene sulfide) tip construction offers excellent chemical resistance to oils, solvents, and corrosive agents in harsh industrial environments.
        • Frequency response from DC to 10 kHz captures both static position and dynamic vibration signals for comprehensive machinery monitoring.
        The 21504-000-020-05-02 is built on the 8 mm eddy current platform, offering 80 mils (2 mm) of linear range with a scale factor of 200 mV/mil (7.87 V/mm). This combination delivers the sensitivity needed to detect subtle changes in shaft position and vibration amplitude, from static thrust shifts to high-frequency dynamic events.

        The 21504-000-020-05-02’s tip is molded from PPS (polyphenylene sulfide), a high-performance plastic that withstands direct contact with air, water, lube oil, ammonium hydroxide, 10% sulfuric acid, MEK, and DMF. This chemical resilience makes it particularly valuable in process compressors, chemical plants, and offshore facilities where exposure to aggressive substances is routine. Unlike materials that can swell or degrade over time, PPS maintains its dimensional stability and electrical properties, ensuring consistent measurement accuracy throughout the probe’s service life.

        All 7200 series components—probes, extension cables, and Proximitors—are designed to be completely interchangeable when matched by length. The 21504-000-020-05-02 can be replaced with any other 8 mm 7200 probe of the same length without recalibration or component matching, dramatically simplifying field service.

        The 21504-000-020-05-02 Bently Nevada Standard Mount Probe may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).

        Bently Nevada 21504-000-020-05-02 Standard Mount Probe Manuals, Datasheets, Drivers, Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
        Bently Nevada 21504-000-020-05-02 Standard Mount Probe Specs

        General

        • Manufacturer GE / Bently Nevada
        • Model 21504-000-020-05-02
        • Condition New Original ready stock
        • Product Family 21504-000-020-50-02,21504-000-020-90-02，21504-000-020-05-00
        Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
        • Radial Vibration Monitoring: Measures axial vibration within bearing clearances to diagnose imbalance, misalignment, or bearing wear.
        • Thrust/Axial Position Monitoring: Monitors rotor axial movement to prevent collisions between the rotor and stator (e.g., impeller and casing).
        • Speed/Phase Reference: Serves as a keyphasor signal source, providing speed data and vibration phase reference.
        • Important Note: The 21504 probe itself is a purely analog passive component and does not contain a microprocessor; therefore, no firmware updates are required.
        • System Level: Firmware updates typically occur on the monitoring instruments connected to the probe (e.g., Bently Nevada 3500/42M displacement card or 3300 monitor).
        • Hardware Evolution: Although there is no firmware update, Bently Nevada periodically improves the probe's physical materials (e.g., cable shielding or connector insulation). It is recommended to check the probe and proximitor model compatibility during maintenance (e.g., the 3300 XL probe must be used with the 3300 XL proximitor).
        • Gap Setting: The gap is typically set by measuring the preamplifier's output voltage using a multimeter. For a standard 3300 XL system, the typical linear center point voltage is -10 VDC (corresponding to approximately a 1.27 mm gap).
        • Software Setup: In the 3500 Rack Configuration software, the correct sensor type must be selected (e.g., "3300 XL 8mm"). The correct scale factor must be set; the standard value is 200 mV/mil (7.87 V/mm).
        • Hardware compatibility: The cable length (2.0 meters) of this model must be matched with the total length of the preamplifier's extension cable (e.g., a total length of 5 meters or 9 meters), otherwise measurement errors will occur.
        View as PDF
        Description
        The 21504-000-020-05-02 is an 8 mm eddy current proximity probe designed for non-contact shaft position and vibration measurements on rotating machinery. It offers a linear range of 80 mils (2 mm) with a scale factor of 200 mV/mil (7.87 V/mm), providing precise output proportional to the gap between probe tip and target.

        With a frequency response from DC to 10 kHz, the 21504-000-020-05-02 captures both static shaft position and dynamic vibration signals. It is compatible with 7200 series Proximitors and extension cables, and can be used in system lengths of 5 or 9 meters when combined with appropriate extension cables. 

        The 21504-000-020-05-02 operates over a temperature range of -30°F to +350°F (-34°C to +177°C) and is suitable for applications such as radial vibration, axial thrust position, shaft average radial position, eccentricity, and Keyphasor measurements.

        This probe solves the challenge of obtaining accurate, repeatable shaft measurements in harsh industrial environments. The 21504-000-020-05-02’s PPS tip resists chemical attack, while its wide temperature range and rugged construction ensure reliable operation in turbines, compressors, pumps, and generators.
        Alternative Names
        21504-000-020-10-02 21504-000-020-50-02 21504-000-020-90-02 21504-000-020-05-00
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        FAQS

        The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
        VIEW ALL FAQS
        What measurements can the 21504-000-020-05-02 perform?
        Radial vibration, axial thrust position, shaft average radial position, eccentricity, and Keyphasor measurements on turbines, compressors, pumps, and generators.
        What is the linear range and scale factor?
        It offers 80 mils (2 mm) linear range with a scale factor of 200 mV/mil (7.87 V/mm) when calibrated as a system.
        What is the operating temperature range of this probe?
        The probe operates from -30°F to +350°F (-34°C to +177°C), suitable for high-temperature machinery applications.
        Is the 21504-000-020-05-02 compatible with other 7200 system components?
        Yes, probes, extension cables, and Proximitors of the same length are completely interchangeable, eliminating bench calibration requirements.

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