190501-01-00-CN Bently Nevada Velomitor CT Velocity Transducer

Overview

The 190501-01-00-00 (190501-01-00) is a specialized low-frequency version of the industry-standard Velomitor Piezo-velocity Sensor. Engineered by Bently Nevada for high-precision machinery protection, this Velomitor CT (Cooling Tower) transducer is optimized to measure casing vibration velocity on cooling tower fans and air-cooled heat-exchanger assemblies. It is specifically designed for equipment operating at or above 90 rpm (typically 100 to 300 rpm). By capturing vibration frequencies generated by both the fan motor and the speed reducer, the 190501-01-00-00 allows plant operators to detect early-stage mechanical wear, preventing catastrophic failures and significantly reducing unplanned downtime in power generation and industrial processing plants.

Suffix Breakdown

The model number 190501-01-00-00 defines the specific hardware and certification configuration as follows:

• 190501: Base Model for the Velomitor CT Velocity Transducer.

• 01 (Mounting Hardware Option): Provided with a 3/8-in 24 to 3/8-in 24 mounting stud for secure mechanical attachment to the machine casing.

• 00 (Connection Option): Features a top-mounted, 2-pin MIL-C-5015 connection interface.

• 00 (Agency Approval Option): Standard configuration without specific hazardous area certifications.

Technical Specifications

Technical FAQs

How does the Velomitor CT differ from a standard Piezo-velocity sensor?

The CT (Cooling Tower) version is specifically tuned for lower frequencies (down to 1.5 Hz), making it ideal for the slow rotational speeds of cooling tower fans where standard sensors lack sufficient sensitivity.

Can this transducer be mounted at any angle?

Yes, the 190501-01-00-00 supports any mounting orientation, allowing for flexible installation on both horizontal and vertical gearboxes or motor casings.

What cabling is recommended for signal integrity?

While the maximum cable length is 305 m, a recommended length of 219 m (720 ft) is advised for high-frequency vibration (1 kHz) to prevent signal degradation due to cable capacitance.

Engineering & Installation Guide

Surface Preparation and Mounting Torque

To ensure accurate data acquisition, the mounting surface must be a 33 mm (1.3 in) diameter flat area. Use a mounting torque of exactly 4.5 N-m (40 in-lbf). Under-torquing leads to poor high-frequency response, while over-torquing can damage the 316L stainless steel base or internal piezo-elements.

Environmental Durability

The 190501-01-00-00 is designed for 100% condensing humidity environments, common in cooling tower interiors. However, it is not rated for submerged operation. For maximum longevity in chemical-laden cooling tower plumes, ensure the MIL-C-5015 connector is properly sealed with a compatible boot or weather-proof conduit.

Wiring and Polarity

The internal electronics are isolated from the case to prevent ground loops. During installation, observe that Pin A goes positive relative to Pin B when the velocity move is from the base toward the top of the transducer.