330190-045-01-00 Bently Nevada 4.5m ETR Extension Cable

Introduction: The Evolution of Precision Measurement in Harsh Environments

For decades, industrial facilities have pushed the boundaries of what measurement systems can endure. Early eddy-current proximity probes struggled in extreme heat, where standard insulation degraded and signal integrity faltered. As turbine and compressor operating temperatures climbed, engineers demanded cabling that could survive without compromising accuracy. The Bently Nevada 3300 XL Extended Temperature Range (ETR) extension cable emerged from this evolutionary pressure. Specifically, the 330190-045-01-00 represents a verified solution for routing proximity probe signals through thermally demanding zones. It preserves the exact electrical characteristics required by 3300 XL systems while withstanding conditions that would destroy conventional cables.

330190-045-01-00 Key Specifications and Construction

This extension cable is a 4.5 metre (14.8 feet) armored assembly. The armor provides mechanical protection against abrasion and impact. Consequently, it suits permanent installations in industrial machinery. The cable uses 75 Ω triaxial construction with perfluoroalkoxy (PFA) insulation. This material choice enables an operating and storage temperature range of -52°C to +260°C. In contrast, standard 3300 XL cables use fluoroethylene propylene (FEP) insulation and are limited to +177°C. Therefore, the ETR variant offers a significant thermal margin for high-temperature applications. Electrical performance is tightly controlled. The nominal DC resistance from center conductor to center conductor (RCORE) is 0.99 ± 0.15 Ω. Meanwhile, the outer conductor to outer conductor resistance (RJACKET) is 0.30 ± 0.06 Ω. Capacitance is 69.9 pF/m (21.3 pF/ft) typical. These precise values ensure signal fidelity across the cable length.

Installation and Compatibility

Installing the 330190-045-01-00 requires attention to bend radius and connector torque. The minimum cable bend radius is 25.4 mm (1.0 in). Exceeding this limit may damage the cable. Connectors are gold-plated brass or gold-plated beryllium copper. Maximum connector torque is 0.565 N·m (5 in·lbf). The cable is compatible with 3300 XL 8 mm probes and Proximitor sensors. It is electrically and physically interchangeable with non-XL 3300 5 mm and 8 mm components when the bend radius is observed. For field wiring, use 3-conductor shielded triad cable with tinned conductors. The maximum length between the Proximitor sensor and monitor is 305 metres (1,000 feet). Longer runs may cause high-frequency signal rolloff. Refer to frequency response graphs in the official datasheet for details.

Reliability and Maintenance

The 330190-045-01-00 is engineered for long-term reliability in extreme conditions. The PFA insulation resists thermal degradation and chemical attack. The armored jacket protects against mechanical wear. Periodic inspection should verify that the bend radius is maintained and connectors are secure. Check for abrasion or cuts in the armor. Because the cable operates in high-temperature zones, ensure that ambient conditions do not exceed the rated maximum of +260°C. Following these practices maximizes service life and measurement accuracy.