330854-040-25-05 3300 XL 25 mm Extension Cable

Overview

Place of Origin:	USA
Brand Name:	Bently Nevada
Model Number:	330854-040-25-05
Packaging Details:	Original new Factory Sealed
Delivery Time:	5-7 days
Payment Terms:	T/T
Supply Ability:	In stock

Quick Detail

Description

The 330854-040-25-05 is a dedicated extension cable used in the 3300 XL 25 mm proximity transducer system for turbine and large rotating equipment monitoring. The 330854-040-25-05 provides a 4.0 m connection between the probe and Proximitor sensor while maintaining the designed signal transmission characteristics of a 75 Ω triaxial line. With a typical capacitance of 69.9 pF/m, the 330854-040-25-05 keeps the probe output (0.787 V/mm) within the calibrated linear measurement range of 12.7 mm, allowing accurate tracking of shaft axial movement and differential expansion values inside steam turbine casings.

The 330854-040-25-05 uses a PFA-insulated FluidLoc cable structure and optional AISI 302 stainless steel armor. This construction allows the 330854-040-25-05 to operate from −35°C up to +200°C in turbine compartments, lube-oil areas, and generator bearing housings. The armored high-temperature design also protects the signal path when routed near hot piping or metal casings. Field wiring accepts 0.2–1.5 mm² conductors, making installation possible in common plant instrument junction boxes.

In automation monitoring systems, the 330854-040-25-05 transfers probe demonstrate data to the monitoring module without altering calibration values. By controlling capacitance per meter and maintaining uniform impedance, the 330854-040-25-05 ensures the vibration and expansion reading remains proportional to actual rotor movement. This allows operators to observe rotor growth differences between stator and shaft during turbine start-up and load change conditions.

Applications

Steam turbine differential expansion measurement

In a steam turbine DE system, 330854-040-25-05 connects the 25 mm probe to the Proximitor sensor and transfers the 0.787 V/mm signal across a 4 m distance. With a linear range of 12.7 mm and cable capacitance of 69.9 pF/m, 330854-040-25-05 keeps the shaft growth signal amplitude readable at the monitor rack. The 75 Ω triaxial structure helps the monitor calculate rotor axial movement without signal distortion when the casing and rotor expand at different rates.

High temperature generator bearing housing installation

Generator bearing areas commonly exceed 150°C. The PFA insulated FluidLoc cable in 330854-040-25-05 operates continuously up to 200°C, allowing the probe to remain mounted near thrust bearings. Using 330854-040-25-05, the proximity signal is transmitted while oil vapor and heat are present around the bearing enclosure.

Turbine casing internal routing

When the probe must be mounted inside the turbine shell, wiring passes through narrow metal channels. The armored AISI 302 stainless sheath of 330854-040-25-05 protects the cable during routing and prevents damage caused by metal edges and vibration contact. The 4.0 m length allows connection from the internal collar measurement position to an external monitoring cabinet.

Petrochemical compressor axial movement monitoring

Large centrifugal compressors experience axial displacement during load change. With field wiring size 0.2–1.5 mm², 330854-040-25-05 connects to plant monitoring panels directly. The low capacitance per meter allows accurate transfer of probe output to vibration monitors measuring shaft position during start-up and shutdown.

Specifications

Competitive Advantage

Maintains signal amplitude across long cable routing

The 69.9 pF/m capacitance and 75 Ω triaxial structure allow 330854-040-25-05 to carry the probe output voltage over 4 meters without excessive attenuation. This allows monitors to interpret shaft movement directly instead of recalibrating monitor gain.

Withstands turbine enclosure heat

Continuous temperature rating to 200°C enables 330854-040-25-05 to be installed near turbine casings and thrust bearings. Plants do not need to relocate sensors away from the measurement point, so actual rotor movement can still be measured at the collar.

Prevents oil and moisture ingress along cable path

The FluidLoc PFA insulation used in 330854-040-25-05 blocks oil migration along the cable jacket. When probes operate in lubricated bearing housings, 330854-040-25-05 prevents contamination from traveling into the connector and sensor electronics.

Allows direct connection to monitoring panels

Field wiring acceptance of 16–24 AWG conductors means 330854-040-25-05 connects directly to control cabinet terminals. Maintenance staff can terminate wires using standard industrial ferrules without installing special adapters.

Protects cable during mechanical routing

The optional AISI 302 stainless armor on 330854-040-25-05 shields the cable when pulled through conduit, turbine casings, or cable trays. This reduces replacement frequency because contact with metal surfaces and vibration does not cut the insulation.

Supports accurate shaft position calculation

Because the cable electrical characteristics match the 3300 XL 25 mm transducer system, 330854-040-25-05 allows the monitoring system to interpret the 12.7 mm measurement range correctly. The monitor can calculate differential expansion without adding compensation circuits.