Bently Nevada 106765-13 Vibration Sensor – 3500 Series

Bently Nevada 106765-13: Piezoelectric Accelerometer for Continuous Machinery Protection

The Bently Nevada 106765-13 is a piezoelectric accelerometer engineered for permanent installation in rotating machinery protection systems. Operating within the Bently Nevada 3500 Series platform architecture, this sensor occupies a deterministic position in the vibration measurement chain: it converts mechanical acceleration at the bearing housing into a charge or voltage signal that feeds directly into the monitor’s signal conditioning circuitry. Unlike proximity probes that measure shaft relative displacement, the 106765-13 targets casing-absolute vibration — a measurement mode mandated by API 670 for certain machine types including gearboxes, high-speed compressors, and electric motors where shaft-riding probes are impractical.

The “-13” suffix designates a specific configuration variant within the 106765 product family, encoding cable assembly length, connector interface, and regional approval markings. Procurement teams must reference this full part number — including suffix — when raising purchase orders, as interchanging suffix variants without engineering review can introduce impedance mismatches or connector incompatibilities at the monitor input card.

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Technical Parameters

Hardware Logical Analysis

The 106765-13 employs a shear-mode piezoelectric sensing element rather than a compression-mode design. In shear-mode geometry, the piezoelectric crystal is mechanically loaded in shear when the sensor body accelerates. This configuration yields two measurable engineering advantages: first, the output is inherently insensitive to base strain — a critical property when the sensor is mounted on a bearing housing that flexes under thermal load or pipe stress; second, shear-mode elements exhibit lower pyroelectric sensitivity, meaning thermal transients at the mounting surface generate substantially less spurious output than compression-mode equivalents operating in the same environment.

The integral cable assembly is a deliberate design choice for this series. Field-replaceable connector designs introduce a mechanical discontinuity at the sensor body that becomes a fatigue initiation site under continuous vibration. By potting the cable exit with a strain-relief compound and routing the cable through a defined bend radius, Bently Nevada eliminates this failure mode for the expected service life of the sensor in a 24/7 protection application.

EMC performance is addressed at two levels. The cable shield is terminated at the sensor body to the housing ground, providing a Faraday enclosure around the signal conductor from the sensing element to the monitor input. The IEPE bias current circuit within the monitor provides a low-impedance return path that further attenuates common-mode interference picked up along cable runs that may pass through high-voltage switchgear rooms or variable-frequency drive enclosures. For installations where cable runs exceed 30 meters or pass through particularly aggressive EMI environments, Bently Nevada recommends the use of a dedicated signal conditioner module to re-drive the signal before entry into the 3500 rack.

The 316L stainless steel housing provides corrosion resistance in environments where hydrogen sulfide, chloride-bearing process fluids, or wash-down chemicals are present. The IP67 rating confirms the sensor can withstand temporary immersion, which is relevant for installations on equipment subject to periodic steam cleaning or located in areas prone to flooding.

System Integration Benefits

• Direct 3500 Series Compatibility: The 106765-13 is factory-validated for use with Bently Nevada 3500/42M and 3500/40M monitor cards, eliminating the signal conditioning uncertainty that arises when using third-party sensors with OEM monitors.
• API 670 Compliance Path: Casing-absolute vibration measurement using this sensor satisfies the API 670 fifth edition requirement for absolute vibration monitoring on machine types where shaft-riding probes cannot be applied, supporting machinery protection system certification audits.
• Deterministic Alarm Response: Because the sensor output feeds directly into the 3500 monitor’s hardware comparator — not through a software polling loop — the alarm-to-relay response time is bounded by the monitor’s hardware architecture (typically <1 ms for danger-level events), independent of host DCS scan rate.
• Calibration Traceability: Each unit ships with factory calibration data traceable to NIST standards, providing the documentation baseline required for ISO 10816 / ISO 20816 compliance programs and insurance audits.
• Reduced Wiring Complexity: The IEPE signal standard allows the sensor to be powered and its signal transmitted over a single coaxial cable pair, reducing terminal block count and cable tray fill compared to 4-wire transmitter installations.
• Diagnostic Transparency: The 3500 monitor continuously checks the IEPE bias voltage at the sensor input. An open-circuit cable, a failed sensor, or a shorted connector produces a measurable bias deviation that the monitor flags as a sensor fault — providing positive indication of measurement chain integrity without requiring manual loop checks.
• Thermal Stability Across Process Upsets: The shear-mode element’s low pyroelectric coefficient means that rapid temperature changes during process upsets — steam purges, emergency shutdowns, or cold-start sequences — do not generate false high-vibration alarms that could mask genuine machinery events or trigger spurious trips.
• Long-Term Stability for Trending: The piezoelectric element’s charge sensitivity is stable over the sensor’s service life when operated within its rated temperature range, supporting long-term vibration trending programs where year-on-year baseline comparisons are used to schedule maintenance interventions.

Quality Assurance & Global Logistics

Every Bently Nevada 106765-13 unit supplied through siemensplc.com is sourced from authorized distribution channels or verified surplus inventory with full part traceability. Pre-shipment inspection covers visual examination of the housing, connector, and cable assembly; dimensional verification of the mounting thread; and functional bias voltage check where test equipment permits. Units are packaged in anti-static protective packaging with tamper-evident sealing and a part label that cross-references the order documentation.

Shipments originate from Xiamen, China. Xiamen is a designated free-trade port with direct air freight connections to major industrial hubs across Southeast Asia, the Middle East, Europe, and the Americas. Standard export documentation — commercial invoice, packing list, and certificate of origin — is prepared for every shipment. For orders requiring a Certificate of Conformance or third-party inspection report, these are arranged at the quotation stage. Typical dispatch lead time for in-stock units is 1–3 business days from order confirmation. DHL Express, FedEx International Priority, and UPS Worldwide Express are the primary carriers, with transit times of 3–7 business days to most destinations. For time-critical plant shutdowns, same-day dispatch on orders confirmed before 14:00 CST is available — contact the sales team to confirm cut-off for your destination.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
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