Product Overview

The Bently Nevada 89477-50 is a high-performance interconnect cable specifically engineered to interface with Velomitor Piezo-velocity Sensors. Unlike standard vibration probes, Velomitor sensors utilize solid-state piezoelectric crystals to measure absolute casing vibration. Because these sensors contain internal electronics to convert acceleration into a velocity signal, the 89477-50 cable is a critical component for maintaining signal purity and preventing data attenuation between the sensor head and the monitoring system.

This industrial-grade cable is designed to withstand the rigors of machinery environments, ensuring that vibration data remains accurate and free from the interference common in high-voltage industrial areas. It facilitates the seamless integration of Velomitor sensors into Turbine Supervisory Instrumentation (TSI) and other condition monitoring frameworks.

Technical Specifications

• Manufacturer: Bently Nevada

• Model Number: 89477-50

• Cable Type: Two-conductor shielded twisted pair

• Conductor Gauge: 18 AWG

• Insulation Material: Polyvinyl Chloride (PVC)

• Maximum Voltage Rating: 300V

• Temperature Range: -30°C to +100°C (-22°F to +212°F)

• DC Resistance: ≤ 21.4 Ω/km

• Standard Length: 50 Feet (approx. 15.2 meters)

• Application: Connection for Velomitor® Piezo-velocity Sensors

• Dimentions:1.8x1.6x12.3 cm

• Origin: USA

Key Technical Characteristics

• Electromagnetic Interference Shielding: The twisted-pair architecture is specifically chosen to reject common-mode noise and electromagnetic interference (EMI), which is vital for maintaining low-frequency signal accuracy in velocity measurements.

• Thermal and Chemical Durability: The PVC insulation is rated for temperatures up to 105°C and provides basic resistance to the oils and moisture typically found in bearing housing environments.

• Optimized Conductivity: With a low DC resistance profile, the 89477-50 minimizes signal voltage drop over long distances, allowing for reliable data transmission even when the monitoring rack is located far from the machine train.

• Flexible Installation: The cable's physical properties allow for easy routing through conduit and around complex machinery geometries without compromising the internal conductor integrity.

• Solid-State Compatibility: Engineered specifically for the power requirements and signal output of Bently Nevada’s piezo-velocity range, ensuring perfect electrical impedance matching.

Application Utility

The 89477-50 cable is widely used in the power generation and oil and gas sectors to connect sensors mounted on:

• Steam and Gas Turbine bearing housings

• Large centrifugal compressors

• Industrial fans and blowers

• Reciprocating machinery casings

By providing a stable electrical path, this interconnect cable supports the long-term, maintenance-free operation of solid-state vibration monitoring systems, contributing to the overall reliability of predictive maintenance programs.