330854-080-24-00 BENTLY NEVADA

Bently Nevada 330854-080-24-00 Proximity Probe

Product Description:

Description
The 3300 XL 25 mm Transducer System consists of a separate 
25 mm probe, an extension cable, and a 3300 XL 25 mm 
Proximitor Sensor.  The 0.787 V/mm (20 mV/mil) output gives 
this system a linear range of 12.7 mm (500 mils).  Based on 
this linear range, the 3300 XL 25 mm Transducer System is 
suitable for measuring differential expansion (DE) on midsize
to large steam turbine generators caused by the 
difference in growth rates between the turbine rotor and the 
machine stator (casing).
Measuring Differential Expansion (DE)
The Differential Expansion measurement is made by two 
proximity transducers observing a collar or ramp some 
distance from the thrust bearing.  Typical transducer 
mounting arrangements are: 
 l Two transducers observing the same side of a collar. 
 l Two complementary input transducers observing 
opposite sides of a collar, effectively doubling the 
measurable DE range. 
Two transducers with at least one transducer viewing a ramp 
on a rotor and the second transducer viewing either a 
separate ramp or a different location on the rotor to 
compensate for radial movement.  This arrangement adds 
some error to the measurement, but can measure a longer 
total DE distance than the complementary measurement. 
The criteria for selecting a mounting method are the size of 
the available target, the expected amount of rotor axial 
movement and the type of DE target that exists in the 
machine (collar versus ramp).  If sufficient collar height is 
available, two transducers observing the same side of a 

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Hong Kong Fenoux Automation Limited
Our main products include DCS control system spare parts, PLC system spare parts, and robot system spare parts. Our advantageous brands include Allen Bradley, Bently Nevada, ABB, HIMA, Reliance, Bender, National Instruments, Emerson Ovation, Honeywell, Siemens, Allen Bradley, ICS Triplex, FOXBORO, Schneider, GE Fanuc, Motorola, HIMA, Prosoft, and other imported industrial components. Our main products serve a wide range of electronic, metallurgical, chemical, and power plants Industries such as steel mills, rubber, cement, machinery and equipment, and construction.