Product Overview

The Bently Nevada 190501-00-00-04 Velomitor CT (Cooling Tower) Transducer stands as the industry benchmark for monitoring low-frequency vibration in demanding cooling tower environments. Unlike standard velocity sensors, the Velomitor CT utilizes solid-state integrated electronics to convert acceleration into a velocity signal, specifically tuned for the unique mechanical signatures of slow-speed fans and gearboxes.

This transducer eliminates the mechanical wear issues inherent in traditional moving-coil velocity pick-ups, providing a "fit-and-forget" solution for critical infrastructure. By delivering precise, real-time data to Bently Nevada 3500 racks or DCS platforms, it empowers engineers to detect imbalance, blade pitch issues, and bearing degradation before they escalate into catastrophic failures. Its ruggedized design ensures high-fidelity signal transmission even in 100% humidity and corrosive chemical atmospheres.

Part Number Lexicon

The 190501 series configuration defines the mechanical interface and environmental hardening of the sensor.

00 - Mounting Hardware Option

This suffix specifies the standard 1/2-20 UNF mounting stud. It provides a rigid mechanical coupling to the machine casing, ensuring linear frequency response across the entire operating range without signal attenuation from mounting resonance.

00 - Connection Option

Indicates the standard 2-pin MIL-C-5015 top-exit connector. This hermetically sealed interface prevents moisture ingress—the leading cause of sensor drift in cooling tower applications—and supports industry-standard shielded twisted-pair cabling.

04 - Agency Approval

The 04 designation signifies comprehensive hazardous area approvals, including ATEX, IECEx, and North American certifications. This ensures the transducer operates safely in Zone 0, 1, or 2 environments where explosive gases or vapors may be present.

Hardware Specifications

Precision Deployment Protocol

Achieving accurate vibration data starts with the mounting surface. Prepare a flat, smooth spot (1.1 micro-inch Ra) on the gearbox or bearing housing to ensure total surface contact. Apply a light film of silicone grease or oil to the mounting stud to enhance the coupling of high-frequency energy.

Always utilize a torque wrench to tighten the transducer to 3.4 N·m (30 in-lb). Over-tightening can damage the internal piezo-elements, while under-tightening creates "false" vibration peaks. For cooling tower cells, route the cable through rigid or flexible conduit and ensure a drip loop exists to prevent condensed water from following the cable directly into the sensor connector.

Reliability Engineering Edge

The Velomitor CT excels where standard transducers fail. Its internal sensing element is isolated from the 316L stainless steel case, providing superior immunity to ground loops and electromagnetic interference (EMI) generated by large VFD-driven fan motors.

Designed for seamless integration with the Bently Nevada 3500/42M Proximitor Seismic Monitor, it facilitates advanced trend analysis in System 1 software. Whether integrated into a Honeywell Experion PKS via Modbus or used as a standalone safety trip, the 190501-00-00-04 maintains its calibration integrity under constant thermal cycling and exposure to water-treatment chemicals.

Fulfillment Logistics

Delivery time: 3-5 days when payment finish, BY DHL/FEDEX/UPS.

Ships in original factory anti-static industrial packaging to guarantee the integrity of the solid-state electronics.

Field Engineering FAQs

Q1: Can the 190501-00-00-04 be used in place of a standard 330500 Velomitor?

A1: No. The CT version is specifically designed for the low-frequency requirements of cooling towers. Using a standard Velomitor may result in "noise" at lower frequencies, while the CT version provides the necessary damping and frequency window for fan monitoring.

Q2: What cable is recommended for this 2-pin MIL connector?

A2: Use Bently Nevada part number 9571 or equivalent high-quality, shielded twisted-pair cable. Ensure the shield is grounded only at the monitor end to avoid ground loops.

Q3: Is this transducer repairable if the connector pins are damaged?

A3: The unit is hermetically sealed and potted; it is not field-repairable. Damaged connectors require unit replacement to maintain the IP67/IP68 environmental rating.