330854-080-24-00 3300 XL 25 mm Extension Cable

Overview

Place of Origin:	USA
Brand Name:	Bently Nevada
Model Number:	330854-080-24-00
Packaging Details:	Original new Factory Sealed
Delivery Time:	5-7 days
Payment Terms:	T/T
Supply Ability:	In stock

Quick Detail

Description

330854-080-24-00 is a 3300 XL 25 mm Extension Cable used in turbine differential expansion monitoring systems. In the 3300 XL transducer chain, 330854-080-24-00 links the 25 mm probe and the Proximitor sensor and transfers the 0.787 V/mm signal over an 8.0 m routing distance. The 75 Ω triaxial PFA FluidLoc construction of 330854-080-24-00 provides a typical capacitance of 69.9 pF/m, allowing accurate transmission across the 12.7 mm measuring range required for rotor axial movement measurement in steam turbine generators.

Rated from −35°C to +200°C, 330854-080-24-00 operates inside turbine casings and thrust-bearing areas exposed to oil vapor and heat. The high-temperature FluidLoc jacket on 330854-080-24-00 prevents fluid migration along the cable path, and field wiring from 16–24 AWG connects directly to monitoring racks and DCS vibration protection panels. In automation systems, 330854-080-24-00 delivers probe displacement data to protection monitors, enabling operators to observe rotor and stator growth differences during start-up, loading, and shutdown conditions.

Applications

Shaft axial movement monitoring in steam turbines
In a 3300 XL differential expansion system, 330854-080-24-00 carries the 0.787 V/mm displacement signal from the 25 mm probe to the Proximitor sensor over an 8.0 m routing distance. With a 12.7 mm linear measuring range, 330854-080-24-00 allows operators to track rotor growth during turbine start-up and load increase. The 69.9 pF/m cable capacitance keeps the voltage signal within calibration tolerance so the protection monitor can alarm when axial movement approaches thrust limits.

Differential expansion measurement between rotor and casing
Power plant control cabinets receive measurement data through 330854-080-24-00 to compare rotor and stator expansion. Because the cable supports 16–24 AWG field wiring, 330854-080-24-00 connects directly to vibration monitoring racks and turbine supervisory instrumentation panels. Engineers use the transmitted value to determine whether heating rate or load ramp must be adjusted.

High temperature monitoring near thrust bearing housing
Inside turbine enclosures temperatures may exceed 150°C. Rated from −35°C to +200°C, 330854-080-24-00 operates near bearing housings and oil seals. The PFA insulated 75 Ω triaxial construction allows the probe signal to reach the automation system without signal drop during continuous operation.

Specifications

Competitive Advantage

Transmit probe signal across long turbine routing paths
The 8.0 m length of 330854-080-24-00 enables probe installation inside the turbine casing while the monitoring rack remains outside the hot zone. The typical 69.9 pF/m capacitance maintains proper signal amplitude over the full cable length, preventing measurement error in differential expansion readings.

Operate in oil vapor and heat environments
The FluidLoc PFA jacket on 330854-080-24-00 blocks oil migration along the cable and withstands temperatures up to 200°C. This allows installation close to thrust bearings where lubrication oil and heat are present.

Reduce measurement distortion from electromagnetic fields
The 75 Ω triaxial shielding used in 330854-080-24-00 minimizes electromagnetic pickup from nearby generators and excitation systems. The transmitted displacement voltage remains readable by protection monitors even in generator halls.

Connect directly to protection monitors without adapters
330854-080-24-00 accepts 0.2 to 1.5 mm² field wiring and routes directly to Proximitor sensors and monitoring modules. Maintenance crews can replace the cable without modifying the turbine monitoring panel wiring.