Bently Nevada 190501-11-00-04 Velocity Transducer – Velomitor CT

Bently Nevada 190501-11-00-04 Velomitor CT — Piezoelectric Velocity Transducer for Continuous Rotating Machinery Protection

The 190501-11-00-04 is a field-hardened piezoelectric velocity transducer within Bently Nevada’s Velomitor CT (Ceramic Transducer) product line, designed to deliver a direct analog velocity signal to machinery protection racks and condition monitoring systems without requiring external signal integration. Unlike geophone-based sensors that rely on a suspended mass-spring mechanism, the CT architecture uses a shear-mode piezoelectric ceramic stack bonded to a seismic mass. This construction eliminates the mechanical resonance instability inherent to moving-coil designs and extends the usable frequency bandwidth to 2–1000 Hz (±3 dB), covering both low-frequency rotational faults and mid-range bearing defect frequencies within a single transducer body.

The transducer outputs a calibrated 100 mV/in/s (3.94 mV/mm/s) AC-coupled voltage signal, directly compatible with Bently Nevada 3500/40M Proximitor/Velomitor Monitor inputs, 3500/42M Velocity Monitor cards, and ADRE 408 DSPi data acquisition systems. The -04 option code specifies a 2-pin MIL-C-5015 circular connector, providing IP67-rated field termination with positive locking and resistance to repeated connect/disconnect cycles under vibration. The 316 stainless steel housing withstands continuous exposure to process fluids, steam, and industrial cleaning agents without dimensional distortion or galvanic corrosion at the mounting interface.

Deployment environments for the 190501-11-00-04 span oil and gas compressor trains, steam turbine bearing housings, boiler feed pump casings, centrifugal fan bearing pedestals, and marine propulsion auxiliary machinery. In each application, the transducer mounts via a 1/4-28 UNF stainless stud directly to the machine casing or bearing cap, transmitting casing velocity to the monitoring rack with a signal chain latency determined solely by cable propagation — no active electronics in the sensor body introduce group delay or phase distortion within the measurement band.

The operating temperature envelope of -40 °C to +121 °C (-40 °F to +250 °F) accommodates both arctic outdoor installations and hot-section bearing housings on gas turbines. Sensitivity drift across this range is controlled by the ceramic element’s low pyroelectric coefficient and the matched thermal expansion of the stainless housing assembly, maintaining measurement accuracy without field recalibration between seasonal extremes.

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Technical Parameters

Hardware Logical Analysis

The 190501-11-00-04’s core differentiator versus conventional geophone velocity sensors is the elimination of all moving mechanical parts from the sensing element. A geophone relies on a coil suspended within a permanent magnetic field; at frequencies approaching the sensor’s natural frequency (typically 4.5–10 Hz for industrial geophones), the mass-spring system introduces amplitude and phase errors that require electronic compensation. The Velomitor CT replaces this with a shear-mode piezoelectric ceramic bonded between a seismic mass and a rigid base. Mechanical shear stress generated by casing acceleration is converted directly to charge by the piezoelectric effect, then conditioned by an internal charge amplifier to produce the calibrated voltage output. This architecture yields a flat frequency response from 2 Hz to 1000 Hz without the resonance peak correction required by geophone designs.

EMC performance is addressed at the hardware level through a fully shielded stainless steel housing that acts as a Faraday enclosure around the internal electronics. The MIL-C-5015 connector shell provides 360° shield termination at the cable interface, preventing common-mode noise injection from variable-frequency drives, high-voltage switchgear, and RF sources common in industrial environments. The internal charge amplifier operates from the cable shield ground, ensuring that any shield current induced by external fields flows through the low-impedance shield path rather than the signal conductor.

The 1/4-28 UNF stainless mounting stud provides a rigid, low-compliance mechanical interface to the machine casing. Mounting compliance — the elastic deformation of the attachment point under dynamic load — directly attenuates high-frequency signal content. The stainless stud, torqued to Bently Nevada’s specified preload, achieves a mounting resonance well above the 22 kHz sensor resonant frequency, ensuring that the transducer’s frequency response is the limiting factor in the measurement chain rather than the mounting interface. For installations where stud mounting is impractical, the magnetic base adapter option maintains adequate mounting stiffness up to approximately 500 Hz, sufficient for most bearing fault frequency ranges.

System Integration Benefits

• Direct rack compatibility: The 100 mV/in/s output and MIL-C-5015 connector terminate directly to Bently Nevada 3500 series monitor inputs without adapter cables or signal conditioners, reducing BOM complexity and eliminating additional failure points in the signal chain.
• Deterministic signal latency: With no active DSP or firmware in the sensor body, the signal path from casing motion to monitor input is purely analog. Group delay is constant across the measurement band, preserving phase relationships critical for orbit plot analysis and cross-channel correlation in multi-plane balancing.
• Broad machinery compatibility: The 2–1000 Hz bandwidth covers 1× and 2× running speed components for machines operating from 120 RPM to 60,000 RPM, as well as vane-pass, blade-pass, and gear-mesh frequencies for most industrial rotating equipment without sensor substitution.
• Reduced maintenance burden: Absence of moving parts eliminates the wear mechanisms that degrade geophone sensitivity over time. Mean time between replacement is extended, reducing planned maintenance intervals and associated production downtime.
• Hazardous area adaptability: The stainless housing and MIL-spec connector are compatible with ATEX/IECEx zone-rated barrier configurations when paired with appropriate Zener barriers or galvanic isolators, enabling deployment in classified areas without sensor redesign.
• Diagnostic transparency: The flat frequency response and calibrated sensitivity allow direct comparison of velocity spectra against ISO 10816-3 severity zones without frequency-dependent correction factors, simplifying alarm setpoint engineering and audit documentation.
• Drop-in field replacement: Mechanical and electrical compatibility with the legacy 190501 series means existing cable runs, junction boxes, and monitor channel configurations require no modification during sensor replacement, reducing mean time to repair.
• Temperature-stable calibration: The ceramic element’s low pyroelectric coefficient limits sensitivity variation to within ±2% across the full -40 °C to +121 °C operating range, maintaining alarm accuracy without temperature compensation in the monitor configuration.

Quality Assurance & Global Logistics

Every 190501-11-00-04 unit supplied by siemensplc.com is sourced through verified channels with full chain-of-custody documentation traceable to authorized Bently Nevada (Baker Hughes) distribution. Pre-shipment inspection covers connector shell integrity, housing surface condition, and sensitivity verification against the factory calibration certificate. Units are serialized and lot-recorded with traceability records retained for a minimum of five years, supporting customer audit requirements under ISO 9001 and API 670 quality management frameworks.

Packaging follows anti-static and humidity-controlled protocols: each transducer is sealed in an ESD-protective bag with a humidity indicator card, cushioned in closed-cell foam, and enclosed in a double-wall corrugated carton rated for international air freight handling. Export documentation — commercial invoice, packing list, and certificate of origin — is prepared for all international shipments. Dispatch from Xiamen, China typically occurs within 1–2 business days for in-stock units. Air freight transit times to major industrial hubs: Southeast Asia 2–4 days, Middle East 4–6 days, Europe 5–7 days, North America 6–9 days. DDP (Delivered Duty Paid) terms are available on request for buyers requiring landed-cost certainty.

Contact Information

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