Bently Nevada 190501-11-00-01 Velocity Transducer – Velomitor CT

Bently Nevada 190501-11-00-01 Velomitor CT — Absolute Velocity Measurement for Continuous Machinery Protection

The Bently Nevada 190501-11-00-01 is a compact, high-temperature piezoelectric velocity transducer engineered for permanent installation on rotating machinery in demanding industrial environments. Classified under the Velomitor CT (Compact, high-Temperature) product line, this unit delivers absolute velocity output across a calibrated frequency band of 2 Hz to 1,000 Hz, making it directly compatible with Bently Nevada 3500 and 3300 Series continuous monitoring racks without signal conditioning intermediaries. Its role in a machinery protection loop is unambiguous: it converts mechanical vibration energy into a proportional voltage signal that the monitoring system uses to trigger alarms, initiate shutdowns, and log trend data for predictive maintenance programs.

Unlike proximity probes that measure shaft relative displacement, the 190501-11-00-01 measures absolute casing velocity — a parameter that is particularly sensitive to structural resonance, bearing defects, and imbalance in mid-frequency rotating equipment such as centrifugal pumps, gas compressors, steam turbines, and electric motors. The transducer’s IEPE (Integrated Electronics Piezo-Electric) output architecture eliminates the need for external charge amplifiers, reducing wiring complexity and susceptibility to cable-induced noise in long cable runs typical of offshore and refinery installations.

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Technical Parameters

Hardware Logical Analysis

The 190501-11-00-01 employs a shear-mode piezoelectric sensing element bonded to an internal seismic mass. Under vibration, the inertial mass exerts a shear force on the piezo crystal proportional to acceleration; the integrated IEPE circuit then performs analog integration to convert the acceleration signal to velocity, delivering a low-impedance voltage output directly usable by the monitoring rack’s velocity input card (e.g., Bently Nevada 3500/42M or 3500/46M).

EMC Design: The stainless steel housing acts as a Faraday shield, attenuating radiated electromagnetic interference from variable-frequency drives, high-voltage switchgear, and RF sources common in petrochemical plants. The MIL-C-5015 bayonet connector provides a continuous 360° ground shield termination, preventing ground loop injection at the cable entry point — a failure mode that frequently corrupts velocity signals in installations where cable runs exceed 30 meters.

Thermal Stability: The CT designation indicates the internal electronics and adhesive bonding compounds are rated to +121°C continuous. Standard Velomitor variants (non-CT) are limited to +93°C. In steam turbine bearing housings or exhaust-side compressor frames where ambient temperatures routinely exceed 100°C, the CT variant is the only electrically safe choice. The piezo element’s charge sensitivity drift across the full operating temperature range is maintained within ±0.5 dB, ensuring alarm setpoints remain valid without field recalibration.

Mechanical Resonance Isolation: The internal seismic mass is decoupled from the housing via a precision-machined isolation stack. This design pushes the transducer’s mechanical resonant frequency above 18 kHz — well beyond the 1 kHz upper measurement limit — preventing resonance amplification from corrupting in-band velocity readings during high-frequency structural excitation events such as blade-pass frequencies in multi-stage compressors.

Stud Mount Integrity: The 1/4-28 UNF stud mount, when torqued to the manufacturer’s specification of 2.8 N·m, achieves a mounting resonance above 5 kHz on standard steel machinery surfaces. Improper torque — a common field error — shifts the mounting resonance into the measurement band and introduces a spurious amplitude peak that can trigger false high-vibration alarms. The transducer’s flat-bottom mounting surface is machined to Ra ≤ 1.6 µm to maximize contact area and minimize interface compliance.

System Integration Benefits

• Direct rack compatibility: Plug-and-play interface with Bently Nevada 3500/42M and 3500/46M velocity input modules; no signal conditioning or impedance matching required, reducing BOM complexity and potential failure nodes.
• Deterministic alarm response: The low-impedance IEPE output maintains signal integrity across cable runs up to 300 meters, ensuring the monitoring rack receives an undistorted velocity waveform and can execute alarm/trip logic within the system’s defined scan cycle — typically < 20 ms for the 3500 Series.
• API 670 compliance pathway: The transducer’s sensitivity, frequency range, and temperature rating satisfy the measurement requirements of API Standard 670 (5th Edition) for non-contacting and contacting vibration measurement systems, supporting compliance documentation for new machinery installations in regulated industries.
• Diagnostic transparency: The absolute velocity output enables direct comparison against ISO 10816-3 vibration severity zones without conversion factors, simplifying alarm setpoint engineering and audit documentation.
• Reduced maintenance burden: Absence of moving parts and hermetically sealed housing eliminate scheduled maintenance intervals. Mean time between failures (MTBF) for the Velomitor CT series exceeds 100,000 hours in continuous service under rated conditions.
• Multi-channel scalability: A single 3500/42M card accepts up to four velocity transducer inputs. The 190501-11-00-01’s standardized IEPE interface allows mixed-channel configurations alongside accelerometers on the same rack without additional power supply modules.
• Condition monitoring integration: The transducer’s wideband output (2 Hz – 1,000 Hz) supports both overall vibration alarming and narrowband spectral analysis in Bently Nevada System 1 software, enabling bearing defect frequency tracking, imbalance trending, and misalignment detection from a single installed sensor.
• Hazardous area adaptability: While the base 190501-11-00-01 is a general-purpose unit, its signal interface is compatible with Bently Nevada’s intrinsically safe barriers (e.g., 3500/05-01-02-00-00-00 I/O module with IS option), allowing deployment in Zone 1 / Division 1 classified areas when paired with the appropriate barrier assembly.

Quality Assurance & Global Logistics

Every 190501-11-00-01 unit supplied by siemensplc.com is sourced from authorized Bently Nevada (Baker Hughes) distribution channels or verified OEM-surplus stock with full traceability documentation. Pre-shipment inspection includes visual examination of the housing, connector, and mounting thread; functional verification of bias voltage output under constant-current excitation; and sensitivity spot-check against the factory calibration certificate where available.

Units are dispatched from our Xiamen, China warehouse. Xiamen’s Gaoqi International Airport and Xiamen Port provide direct freight access to major industrial hubs across Southeast Asia, the Middle East, Europe, and the Americas. Standard air freight transit times are 3–5 business days to most destinations. DHL Express, FedEx International Priority, and UPS Worldwide Express are available for time-critical requirements. Sea freight consolidation is available for bulk orders. Export documentation — commercial invoice, packing list, certificate of origin, and MSDS where applicable — is prepared in compliance with destination country customs requirements. HS Code 9031.80 applies to this product category for customs classification purposes.

A 12-month warranty covers manufacturing defects and premature failure under rated operating conditions. Warranty claims are processed with a target replacement dispatch of 5 business days from confirmed fault diagnosis. Customers in the oil & gas, power generation, and petrochemical sectors are encouraged to maintain a spare unit on-site given the criticality of continuous machinery monitoring to production uptime.

Contact Information

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