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    Apter Power secures hard-to-find Bently Nevada legacy monitoring hardware, providing dependable displacement probes to support your aging vibration protection systems.

21504-00-08-10-02

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The 21504-00-08-10-02 is a 7200 Proximity Transducer System probe featuring an 8 mm diameter, a standard configuration type, 3/8-24 threads, and a design without lead armor.
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Technical specifications for 21504-00-08-10-02

  • Manufacturer:
    Bently Nevada
  • Part Number:
    21504-00-08-10-02
  • Product Family:
    7200 Proximity Transducer Systems
  • Product Type:
    8 mm Standard Mount Probe
  • Stock:
    5
  • nthreaded Length Option:
    0.0 inches
  • Overall case length option:
    0.8 inches
  • Total length option:
    1 metre
  • Connector option:
    With miniature male coaxial connector
  • With miniature male coaxial connector:
    8mm
  • Configurations type and thread:
    Standard, 3/8-24
  • Standard, 3/8-24:
    -17.5 Vdc to -26 Vdc
  • Weight:
    0.4 kg
  • Estimated shipping dimensions:
    8x6x5cm
  • Tariff Code:
    8537101190
  • 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 Application Operating Environment Monitoring

Features:

  • 8 mm probe diameter with 3/8-24 UNF threads provides standard English mounting compatibility and the enhanced durability of larger tip construction.
  • PPS (polyphenylene sulfide) tip material offers excellent chemical resistance to oils, solvents, and corrosive agents common in industrial environments.t
  • Integral cable design with 1.0 meter length simplifies installation by eliminating the need for a separate extension cable in many applications.
The 21504-00-08-10-02 leverages the inherent durability advantages of the 8 mm platform, featuring thicker encapsulation of the probe coil in molded PPS plastic than 5 mm alternatives. This design choice significantly improves resistance to physical abuse, making the probe well-suited for machinery where accidental contact during installation or maintenance is a concern.

The 21504-00-08-10-02 is constructed with a PPS (polyphenylene sulfide) probe tip, a material chosen for its exceptional resistance to a wide range of industrial chemicals. This makes the probe particularly suitable for applications where exposure to lubricating oils, hydraulic fluids, solvents, or corrosive agents is routine—common in process compressors, chemical plants, and offshore facilities.

The 21504-00-08-10-02 features a 1.0-meter integral cable, eliminating the need for a separate extension cable in many standard installations. This design reduces the number of connections in the monitoring path, which in turn reduces potential failure points and simplifies parts management. The cable is terminated with a gold-plated ClickLoc connector that locks securely with finger-tight torque, requiring no special tools for installation.

The 21504-00-08-10-02 Bently Nevada Proximity Probe may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
Bently Nevada 21504-00-08-10-02 Proximity 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 21504-00-08-10-02 Proximity Probe Specs

General

  • Manufacturer Bently Nevada
  • Model 21504-00-08-10-02
  • Condition New Original ready stock
  • Product Family 21504-00-08-50-02,21504-00-08-90-02,21504-00-08-10-00
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.
  • Critical Machinery Monitoring: Widely used in steam turbines, large compressors, centrifugal pumps, and generators to mount probes for measuring axial vibration, axial displacement, or speed (keyphasor).
  • Online Maintenance and Calibration: This housing is an essential component when internal space is limited, or when it is necessary to adjust the probe gap or replace the probe without removing the machine cover/stopping the machine.
  • API 670 Compliance: Designed to comply with American Petroleum Institute (API 670) standards, suitable for critical equipment protection in the global oil, gas, and power industries.
  • Physical Protection: The main housing is typically made of aluminum or stainless steel, providing excellent sealing (NEMA 4X or IP66 rating) to prevent the ingress of oil, water, dust, and corrosive chemicals.
  • Hazardous Areas: Depending on the model suffix (e.g., option 02), this assembly is CSA/NRTL/C explosion-proof certified and can be safely installed in flammable and explosive environments such as Class I, Division 2, or Zone 2.
  • Structural Strength: The housing can withstand the strong vibrations generated during mechanical operation, protecting the internal probes and connectors from physical damage.
  • Probe Adjustment (Control): Through the adjustment mechanism on the housing, technicians can use a multimeter to monitor the preamplifier output voltage while the machine is running and precisely rotate the probe to set the DC bias voltage (typically -10 VDC) to achieve the optimal linear measurement point.
  • Signal Monitoring: The probe inside the housing converts mechanical vibration or displacement into analog voltage signals and transmits them to the 3500 monitoring system via coaxial cable.
  • The monitoring system continuously analyzes the signal. If the vibration exceeds the preset "Alert" or "Danger" threshold, it will automatically execute an alarm or trip protection procedure.
Description
The Bently Nevada 21504-00-08-10-02 proximity probe is engineered to handle severe mechanical stress, moisture entry, and physical wear during sensor handling. It solves the critical problem of cable detachment at the probe tip—a frequent failure point during installation and high-vibration operation—by incorporating the specialized Cable Loc™ technology. By ensuring a ruggedized, permanent connection between the coaxial cable and the probe head, the Bently Nevada 21504-00-08-10-02 prevents signal loss and unexpected downtime. Furthermore, constructed from high-performance polyphenylene sulfide (PPS) plastic, the probe head withstands exceptionally harsh, humid, wet, or chemically corrosive fluids, eliminating the degradation or short-circuit issues that commonly plague standard fiberglass sensors in industrial spaces.

The Bently Nevada 21504-00-08-10-02 is widely utilized across critical process industries, including oil and gas, petrochemical processing, power generation, and municipal water treatment plants. Within these environments, it is applied directly to rotating and reciprocating machinery such as steam and gas turbines, centrifugal compressors, high-speed process pumps, and electric motor generators. The probe serves as the primary tool for API 670-compliant machinery protection, monitoring vital parameters such as radial shaft vibration to detect bearing wear, rotor imbalance, and shaft misalignment.

For physical installation, the Bently Nevada 21504-00-08-10-02 requires direct mounting through the machine case or a specialized housing junction box using standard 3/8-24 threaded entry ports. Proper integration relies on strict physical positioning (gapping) while the shaft is motionless, establishing an initial calibrated gap voltage around -9 Vdc via a micrometer or multimeter check. To achieve a complete functional loop, the 1.0-metre integral cable of the Bently Nevada 21504-00-08-10-02 must connect via its miniature male coaxial connector to a matching 7200 Series extension cable, which feeds back directly into a compatible 7200 Series Proximitor sensor or specialized monitoring rack.
Alternative Names
21504 00 08 10 02 21504-00-08-10-00 21504-00-08-05-02 21504-00-08-50-02 21504-00-08-90-02 21504-00-96-10-02 21504-00-24-10-02
Technical notes
The Bently Nevada 21504-00-08-10-02 gap voltage sensor system utilizes the eddy current principle and provides a high linearity factor of 200 mV/mil (8 V/mm) within a linear range of 80 mil (2 mm), making it ideal for continuous mechanical protection.
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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.
What type of probes does the 21504‑00‑08‑10‑02 housing support?
It supports standard 5 mm and 8 mm proximity probes compatible with Bently Nevada 3300 XL series.
What is the material of the 21504-00-08-10-02 probe housing?
The housing is made of durable aluminum with stainless steel sleeves for corrosion resistance.
What is the operating temperature range of 21504-00-08-10-02?
The housing and probe assembly can operate from –51 °C to +177 °C (–60 °F to +351 °F), depending on the probe type.
Is 21504-00-08-10-02 suitable for use in hazardous environments?
Yes, when configured with the correct fittings, it meets CSA Type 4 requirements and can be used in hazardous areas.
How is the 21504-00-08-10-02 probe installed in the housing?
Probes are mounted via threaded inserts in the housing, allowing precise positioning and secure alignment for vibration monitoring.

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