Bently Nevada 190501-19-00-01 Velocity Transducer – Velomitor CT

Bently Nevada 190501-19-00-01 Velomitor CT — Piezoelectric Velocity Transducer for Continuous Machinery Protection

The 190501-19-00-01 is a two-wire, loop-powered piezoelectric velocity transducer belonging to Bently Nevada’s Velomitor CT platform. It is purpose-built for permanent, stud-mounted installation on rotating and reciprocating machinery casings where ISO 10816 / ISO 20816 casing vibration compliance is a contractual or regulatory requirement. The unit delivers a 4–20 mA velocity-proportional output across a 2 Hz to 1,000 Hz bandwidth, eliminating the external signal integrator stage that older charge-output piezoelectric sensors demand. Within a 3500 Series Machinery Protection System rack, this transducer feeds directly into a 3500/42M Vibration Monitor or 3500/25 Transient Data Interface without additional signal conditioning hardware.

The -19-00-01 suffix encodes a 19-foot (5.8 m) factory-terminated integral cable with a 2-pin MIL-C-5015 style connector. This cable length is the most commonly specified variant for turbine bearing pedestals and compressor skid installations where the junction box is located within one machine bay. The hermetically sealed stainless steel housing achieves IP67 ingress protection, making the unit suitable for wash-down environments, offshore platform decks, and chemical plant areas where condensation and process fluid splash are routine operating conditions.

Procurement engineers specifying vibration monitoring on steam turbines, gas turbines, centrifugal compressors, boiler feed pumps, and large electric motors (≥75 kW) will find the 190501-19-00-01 a direct, calibration-free replacement for earlier 190501-series variants. The 4–20 mA loop-powered architecture is natively compatible with any standard PLC or DCS analog input card — Siemens S7-300/400/1500, ABB AC500, Rockwell ControlLogix, Honeywell Experion, and Emerson DeltaV — without requiring proprietary interface modules.

Real-time Stock & RFQ: [email protected] | WhatsApp: +86 18359268345

Technical Parameters

Hardware Logical Analysis

The Velomitor CT architecture departs from classical charge-mode piezoelectric sensors by integrating a low-noise ASIC signal conditioning stage inside the transducer housing. The piezoelectric crystal stack generates a charge proportional to casing acceleration. The internal ASIC performs charge-to-voltage conversion, single-integration to derive velocity, and voltage-to-current conversion to produce the 4–20 mA loop output — all within a hermetically sealed titanium-welded cavity. This eliminates three discrete failure points present in external integrator configurations: the charge amplifier, the integrator op-amp stage, and the inter-module cable susceptible to triboelectric noise.

EMC Design: The stainless steel housing acts as a Faraday shield, attenuating radiated RF interference from variable-frequency drives (VFDs) and high-voltage bus bars common in turbine halls. The 4–20 mA current loop is inherently immune to resistive voltage drops across long cable runs — a critical advantage over voltage-output sensors in installations where cable runs exceed 50 m. The MIL-C-5015 connector provides positive locking and gold-plated contacts rated for ≥500 mating cycles, maintaining contact resistance below 5 mΩ across the operating temperature range.

Frequency Domain Behavior: The 2 Hz lower cutoff is achieved through a high-pass filter network within the ASIC, enabling detection of very low-speed machinery (≥120 RPM) without DC drift contamination. The 1,000 Hz upper cutoff captures the 1× through approximately 16× running speed harmonics on a 3,600 RPM machine, covering the principal fault frequencies for imbalance (1×), misalignment (2×), blade pass, and bearing defect frequencies (BPFO, BPFI, BSF) for most industrial bearing geometries. The ≥22 kHz resonant frequency ensures the sensor’s own structural resonance does not alias into the measurement band.

Thermal Stability: The piezoelectric element is selected for low pyroelectric coefficient, minimizing output drift during thermal transients — a documented failure mode in turbine startup sequences where casing temperature can rise 80 °C in under 10 minutes. The hermetic seal prevents moisture-induced depolarization of the crystal, which is the primary long-term degradation mechanism in non-sealed competitive sensors operating in humid tropical or coastal environments.

System Integration Benefits

• Direct 3500 rack compatibility: The 4–20 mA output maps directly to the 3500/42M velocity input channel without jumper reconfiguration or software scaling adjustments, reducing commissioning time per channel to under 15 minutes.
• Universal PLC/DCS analog input compatibility: Standard 4–20 mA current loop interfaces with Siemens SM 331, ABB AI810, Rockwell 1756-IF16, and all equivalent analog input modules at 250 Ω burden resistance, requiring no special input cards.
• Deterministic signal latency: The current-loop output has no digital packetization delay. Signal propagation from mechanical event to analog input register update is bounded by cable propagation time plus ADC scan cycle — typically under 1 ms for a 1 kHz sampling AI module.
• Simplified cable infrastructure: Two-wire loop power eliminates the separate excitation supply cable required by IEPE (ICP) sensors, reducing conduit fill by 33% on multi-channel installations and lowering installed wiring cost per measurement point.
• Intrinsic diagnostic transparency: A 4 mA live-zero signal distinguishes a healthy sensor at zero vibration from an open-circuit fault (0 mA) or a short-circuit fault (saturation). This allows the 3500 rack or DCS to generate a sensor-fault alarm without additional hardware.
• Drop-in mechanical replacement: The 1/4-28 UNF stud mount and MIL-C-5015 connector are dimensionally identical across the 190501 series, enabling field replacement without drilling new mounting holes or re-terminating junction box wiring.
• ISO 10816 / ISO 20816 measurement compliance: The 2–1,000 Hz bandwidth and velocity output format align directly with the measurement requirements of ISO 10816-3 (industrial machines above 15 kW) and ISO 20816-3, supporting regulatory compliance documentation without post-processing.
• Multi-vendor DCS historian integration: The 4–20 mA signal is accepted by Honeywell Experion PKS, Emerson DeltaV, Yokogawa CENTUM VP, and ABB System 800xA analog input modules, enabling vibration trend data to be archived in the plant historian alongside process variables without a dedicated vibration data acquisition system.

Quality Assurance & Global Logistics

Every 190501-19-00-01 unit stocked at our Xiamen, China facility undergoes a structured incoming inspection protocol before it is offered for sale. Physical inspection covers housing integrity, connector pin condition, cable jacket continuity, and label authenticity cross-referenced against Bently Nevada’s published part number format. Electrical verification confirms loop current output within the 4–20 mA specification at a known reference vibration input. Units with ambiguous provenance documentation are quarantined and not listed.

Calibration certificates and original Bently Nevada packaging are available upon request and are provided at no additional charge for units where original documentation accompanies the stock. Counterfeit screening is performed in accordance with AS6081 guidelines, including visual inspection under magnification and connector metallurgy spot-checks. All units carry a 12-month warranty from the date of shipment covering manufacturing defects and functional failure under normal operating conditions.

Logistics from Xiamen operate via DHL Express, FedEx International Priority, and UPS Worldwide Express. Standard dispatch lead time is 1–3 business days from payment confirmation. Export documentation — commercial invoice, packing list, certificate of origin, and HS code 9031.80 classification — is prepared in-house to minimize customs clearance delays at destination ports in the EU, USA, Southeast Asia, and the Middle East. Incoterms EXW, FOB Xiamen, and CIF destination are all available. For time-critical plant shutdowns, same-day dispatch on orders confirmed before 14:00 CST is available upon request.

Contact Information

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