330854-080-24-CN 3300 XL 25 mm Extension Cable

Overview

Place of Origin:	USA
Brand Name:	Bently Nevada
Model Number:	330854-080-24-CN
Packaging Details:	Original new Factory Sealed
Delivery Time:	5-7 days
Payment Terms:	T/T
Supply Ability:	In stock

Quick Detail

Description

The 330854-080-24-CN 3300 XL 25 mm Extension Cable is used in proximity transducer systems for turbine and rotating equipment automation. The 330854-080-24-CN provides an 8.0 m connection distance between the 25 mm probe and the Proximitor sensor so the monitoring rack can receive shaft displacement signals in real time. With a linear measuring range of 12.7 mm, the transmitted signal directly represents rotor axial movement and differential expansion inside large machines.

The 330854-080-24-CN uses a 75 Ω triaxial FluidLoc cable with PFA insulation and a typical capacitance of 69.9 pF/m. This capacitance value is important because a long cable increases electrical loading on the probe circuit. By keeping capacitance near 69.9 pF/m, the 330854-080-24-CN allows the sensor output to remain within the calibrated scale of the monitoring module, preventing measurement deviation when connected to vibration monitors or PLC analog inputs.

Field wiring supports 0.2 to 1.5 mm² conductors, enabling direct connection to protection systems and control cabinets. The optional AISI 302 stainless steel armor protects the 330854-080-24-CN when routed across bearing housings and turbine casings. The −35°C to +200°C operating range allows the 330854-080-24-CN to work near steam turbine thrust bearings where casing temperature and radiant heat are present. In automation systems, the 330854-080-24-CN acts as the signal transmission path that links mechanical motion to electronic control decisions.

Applications

Steam turbine differential expansion monitoring
The 330854-080-24-CN links the 25 mm proximity probe mounted at the thrust collar to the monitoring rack. Because the measuring span reaches 12.7 mm, the protection system can track rotor thermal growth during cold start and load increase. The low 69.9 pF/m cable capacitance of the 330854-080-24-CN keeps the transmitted voltage proportional to shaft movement, so the monitoring module interprets true axial displacement rather than attenuated signal values. When expansion approaches the alarm setpoint, the control system initiates operator warning.

Hydroelectric generator shaft position measurement
In hydro units, the probe is installed deep inside the bearing housing while the cabinet is several meters away. The 8.0 m length of the 330854-080-24-CN allows direct routing without junction boxes. The 330854-080-24-CN transfers the shaft centerline position to the PLC, and because its 75 Ω triaxial construction limits signal loss, the generator alignment value remains within calibrated range during load acceptance testing.

Centrifugal compressor thrust movement tracking
A compressor rotor shifts axially when suction pressure changes. The 330854-080-24-CN carries probe output to the machinery protection relay. With capacitance held at 69.9 pF/m, the 330854-080-24-CN prevents electrical loading that could compress the displacement scale. The protection relay therefore reads accurate thrust movement and can trip the compressor before thrust bearing damage occurs.

High temperature bearing housing monitoring
Bearing housings near steam lines often exceed 150°C. The PFA insulated FluidLoc construction allows the 330854-080-24-CN to operate up to 200°C. When the probe measures casing growth, the 330854-080-24-CN continuously delivers displacement data to the monitoring system, enabling operators to verify expansion clearance during steady operation.

Specifications

Competitive Advantage

Maintain accurate displacement transmission over long routing distance
The 330854-080-24-CN provides an 8 m transmission path while maintaining signal proportionality. The 75 Ω triaxial design of the 330854-080-24-CN reduces attenuation, so monitor readings correspond to the full 12.7 mm measurement span.

Reduce signal distortion caused by cable loading
Because the 330854-080-24-CN capacitance is typically 69.9 pF/m, the probe driver circuit stays within its calibration curve. The monitoring module receives the same voltage scale expected from the probe, allowing alarm points to match real mechanical displacement.

Install directly along hot machinery surfaces
The 330854-080-24-CN uses PFA insulation and optional AISI 302 stainless steel armor. This construction lets the 330854-080-24-CN be routed along turbine casings and bearing pedestals where temperatures approach 200°C without needing heat shields.

Connect to protection systems without adapters
The field wiring range of 0.2 to 1.5 mm² allows technicians to terminate the 330854-080-24-CN directly into monitoring racks and PLC terminals. The 330854-080-24-CN therefore shortens installation time and enables immediate commissioning of the vibration protection system.