Bently Nevada 200350-00-00-00 Accelerometer – 3500 Series

Bently Nevada 200350-00-00-00 Piezoelectric Accelerometer — Structural Role in Rotating Machinery Protection Loops

The Bently Nevada 200350-00-00-00 is a piezoelectric accelerometer engineered for continuous vibration monitoring of rotating machinery in process-critical environments. Within a closed-loop machinery protection architecture, this transducer occupies the sensing node of the signal chain: it converts mechanical acceleration events — bearing defects, rotor imbalance, structural resonance — into proportional electrical charge signals that feed directly into the Bently Nevada 3500 Series monitoring rack. Unlike eddy-current proximity probes that measure relative shaft displacement, the 200350-00-00-00 captures absolute casing vibration, making it the preferred sensor for high-frequency fault detection on gearboxes, motor end-bells, and compressor casings where shaft-relative measurement is geometrically impractical.

The transducer operates on the direct piezoelectric effect: an internal PZT (lead zirconate titanate) crystal stack generates a charge proportional to applied acceleration. This charge is conditioned by an external signal conditioner or the integral electronics of the 3500/42M Accelerometer Input Module, which converts the high-impedance charge signal into a low-impedance voltage output suitable for long cable runs in electrically noisy plant environments. The 200350-00-00-00 is designed for stud or adhesive mounting, with a frequency response flat within ±3 dB across the 2 Hz to 10 kHz band — a range that encompasses both low-speed machinery fault frequencies and high-frequency bearing defect frequencies (BPFO, BPFI, BSF) in the 1–5 kHz region.

In API 670-compliant machinery protection systems, the 200350-00-00-00 is typically deployed in pairs per measurement plane — one radial and one axial — on each bearing housing. The 3500 rack processes the conditioned signal through configurable alert and danger setpoints, with response times below 20 ms for danger-level events, ensuring the protection system can initiate a controlled shutdown before mechanical damage propagates to adjacent components.

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Technical Parameters

Hardware Logical Analysis

The 200350-00-00-00 employs a compression-mode PZT crystal stack housed within a hermetically sealed 316L stainless steel body. This construction choice is deliberate: compression-mode designs exhibit lower base strain sensitivity compared to shear-mode configurations, which is critical in applications where the mounting surface itself undergoes thermal expansion or structural flexure. The result is a cleaner signal with reduced low-frequency noise floor contamination — a measurable advantage when monitoring slow-speed machinery (below 600 RPM) where fault frequencies may fall below 10 Hz.

The MIL-spec connector interface provides two key engineering benefits. First, the bayonet-lock mechanism maintains contact integrity under continuous vibration exposure — a failure mode that plagues standard BNC connectors in high-vibration environments. Second, the two-pin configuration separates signal and shield conductors, enabling the external signal conditioner to implement driven-shield topology, which reduces cable capacitance effects on high-frequency signal fidelity over cable runs exceeding 30 meters.

EMC performance is addressed at the housing level: the stainless steel body acts as a Faraday shield for the internal crystal assembly, attenuating radiated RF interference from variable-frequency drives (VFDs) and high-voltage switchgear — both common in the same plant areas where this sensor is deployed. The IP67 sealing prevents condensation ingress that would otherwise create leakage paths across the crystal electrodes, degrading insulation resistance and introducing low-frequency noise. For installations in hydrogen-rich or corrosive atmospheres, the all-stainless construction eliminates galvanic corrosion risk at the sensor body, a documented failure mode with aluminum-housed alternatives.

The resonant frequency specification of ≥ 25 kHz provides a minimum decade of separation between the usable measurement band (10 kHz upper limit) and the first mechanical resonance. This margin ensures that the sensor’s amplitude response remains flat and phase-linear across the full measurement band, which is a prerequisite for accurate envelope analysis and time-waveform interpretation in advanced condition monitoring workflows.

System Integration Benefits

The 200350-00-00-00 delivers the following measurable advantages when integrated into a Bently Nevada 3500 Series machinery protection architecture:

• Deterministic alarm response: The 3500/42M module processes accelerometer inputs with a hardware-enforced scan cycle of < 20 ms, ensuring danger-level events trigger relay outputs within one scan cycle regardless of host SCADA polling rate.
• Direct rack compatibility: The 200350-00-00-00 is factory-characterized for use with the 3500/42M and 3500/42E accelerometer input modules, eliminating the need for external signal conditioning hardware and reducing panel wiring complexity.
• Dual-channel redundancy support: Two sensors per bearing plane can be wired to separate 3500 rack channels, enabling voted 2-of-2 or 1-of-2 protection logic without additional hardware.
• Diagnostic transparency via System 1: When connected through the 3500 rack to Bently Nevada System 1 software, the sensor’s time-waveform and spectrum data are available for continuous trending, enabling bearing defect frequency (BPFO/BPFI/BSF/FTF) tracking with configurable alert bands.
• Wide temperature operating margin: The -55°C to +121°C range accommodates both outdoor installations in cold climates and high-temperature casing locations on steam turbines without derating.
• Low transverse sensitivity (<5%): Minimizes cross-axis contamination in multi-plane measurement configurations, preserving directional fault signature integrity for orbit and ODS analysis.
• Long cable run capability: The charge-mode output, when used with a compatible signal conditioner, supports cable runs up to 300 meters without signal degradation — essential for remote machinery installations in large compressor stations or offshore platforms.
• Standardized HS code 9031.80 classification: Simplifies customs clearance for international procurement, reducing import documentation preparation time for end-users in regulated markets.

Quality Assurance & Global Logistics

Every 200350-00-00-00 unit supplied by siemensplc.com is sourced directly from authorized Bently Nevada (Baker Hughes) distribution channels or verified OEM-surplus inventory with full serialized traceability. Each unit undergoes incoming inspection including sensitivity verification against the factory calibration certificate, insulation resistance measurement (> 100 MΩ at 50 VDC), and connector integrity check prior to dispatch.

Packaging follows ESD-safe and humidity-controlled protocols: anti-static foam insert, desiccant pack with humidity indicator card, and double-wall corrugated outer carton rated for air freight handling. A Certificate of Conformance (CoC) and the original factory calibration data sheet are included with every shipment at no additional charge.

Logistics operations are based in Xiamen, China, with direct access to Xiamen Gaoqi International Airport (XMN) and Xiamen Port for sea freight consolidation. Standard in-stock orders are dispatched within 1–2 business days via DHL Express, FedEx International Priority, or UPS Worldwide Expedited, with typical transit times of 3–5 business days to Europe, North America, and Southeast Asia. For time-critical plant shutdowns, same-day dispatch is available on confirmed orders received before 14:00 CST. All export shipments are screened for EAR/ECCN compliance prior to release.

Contact Information

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