Product Overview

The Bently Nevada 21504-16-32-10-62 represents a pinnacle of eddy current transducer technology, specifically engineered for precision radial vibration and axial position measurements in high-density machinery environments. As a core component of the 3300 series 5mm proximity transducer system, this probe excels in restricted-space applications where standard 8mm probes cannot fit. It delivers a high-fidelity voltage output directly proportional to the distance between the probe tip and the target shaft. This real-time data flow is indispensable for Turbine Supervisory Instrumentation (TSI), enabling early fault detection in high-speed compressors, pumps, and small turbines. Its superior stability and linearized response ensure that critical emergency shutdown systems (ESD) operate with absolute confidence, protecting your most valuable industrial assets from catastrophic failure.

Transducer Configuration Decoding

21504 - 3300 5mm Proximity Probe

This base model identifies the 5mm tip diameter transducer, optimized for targets with smaller surface areas or where mounting space is at a premium.

-16 - Unthreaded Length Option

The "-16" suffix indicates an unthreaded length of 1.6 inches. This configuration allows the probe to pass through housing walls or mounting brackets before the threaded section engages for final positioning.

-32 - Overall Case Length

This designates a 3.2-inch total case length. Matching this dimension to your machine's casing thickness ensures the probe can be gapped correctly against the shaft.

-10-62 - Cable Length and Agency Approvals

The "-10" defines a 1.0-meter (approximately 3.3 feet) integral cable length. The "-62" suffix confirms the probe carries multiple international hazardous area certifications, including ATEX/IECEx and CSA, for safe operation in Zone 0 and Zone 1 environments.

Vital Technical Specifications

Field Commissioning Protocol

During installation, engineers must utilize a digital multimeter to set the "Gap Voltage" to the standardized -10 Vdc center point. This ensures the probe operates within its optimized linear region. The integral cable must be secured with a minimum bend radius of 25.4 mm (1.0 inch) to prevent internal coaxial damage. For hazardous area deployments, ensure all electrical connections are routed through approved safety barriers or galvanic isolators. Proper grounding of the cable shield at the Proximitor side is essential to eliminate high-frequency noise from the measurement signal.

Advanced Environmental Resilience

The 21504-16-32-10-62 features a Polyphenylene Sulfide (PPS) tip, which provides exceptional resistance to chemical corrosion and high-pressure steam. Its hermetically sealed design prevents oil and process fluids from wicking into the coaxial cable, a common failure point in inferior sensors. This probe integrates seamlessly with Bently Nevada 3500 racks and Honeywell Experion PKS, delivering ultra-low noise signals even in the presence of intense electromagnetic interference (EMI) found in power generation and petrochemical facilities.

Ordering info

• One (1) Brand New Bently Nevada 21504-16-32-10-62 5mm Proximity Probe.

• Factory-sealed anti-static protective bag.

• Individual calibration and test data certificate.

• Integral 1.0m cable with miniature coaxial connector.

• One (1) set of adjustment/locking nuts.

Dispatch and Logistics Data

Delivery time: 2-7 days when payment finish via DHL/FEDEX/UPS. All units are shipped in high-impact, anti-static industrial packaging to ensure zero-defect arrival. We provide full real-time tracking for every international shipment, ensuring your maintenance schedule stays on track.

Transducer Technology FAQs

Q1: Can I use this 5mm probe with an 8mm Proximitor sensor?

A1: No. Proximity systems are factory-tuned as a matched set. A 5mm probe must be paired with a 5mm Proximitor to maintain the correct scale factor (7.87 V/mm) and linear range.

Q2: What is the benefit of the "-16" unthreaded length?

A2: This allows the probe to penetrate deep into a machine's mounting bore without threading the entire distance, making the initial installation much faster and reducing the risk of cross-threading.

Q3: Is the 21504 probe compatible with 3300 XL extension cables?

A3: Yes, this probe utilizes standard miniature coaxial connectors compatible with both 3300 and 3300 XL extension cables, provided the total system length remains calibrated (e.g., 5.0m or 9.0m).

Q4: How do I handle a "Not OK" status on the 3500 monitor?

A4: Check the gap voltage first. If the voltage is outside the -2V to -18V range, the probe is either touching the shaft or is too far away. Readjust the physical gap to restore the -10V signal.