Bently nevada 330850-90-05, In Stock, please contact us and we will provide you with an official quotation！

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Warranty: 12 months.

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Manufacturer: Bently Nevada

Part Number: 330850-90-05

Product Type: 3300 XL 25 mm Proximitor Sensor

Total Length and Mounting: 9.0 metres (29.5 feet) system length, panel mount

Series: 3300

Availability: In stock

Functional Description

Bently nevada 330850-90-05 3300 XL 25 mm Proximitor Sensor is a part of the 3300 XL 25mm Proximity Transducer System. 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 mid-size 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:

1. Two transducers observing the same side of a collar

2. 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 collar is the preferred configuration. These two transducers provide redundant measurements.

System Compatibility

The 3300 XL 25 mm probe comes in a large variety of case configurations to physically replace all standard 7200 25 mm, 7200 35 mm and 25 mm DE Integral transducer systems (including side and rear exit probes). The Proximitor Sensor also has an output that is identical to that of the 7200 and 25 mm DE Integral systems, allowing customers to upgrade without requiring any changes in the monitor configuration. When upgrading from previous systems, every transducer system component (probe, extension cable, and Proximitor Sensor) must be replaced with 3300 XL 25 mm components. 

Proximitor Sensor

The 3300 XL 25 mm Proximitor Sensor1 has the same advanced features as our previous 3300 XL Proximitor Sensors. It’s thin design allows it to be mounted in either a high-density DIN-rail installation or a more traditional panel mount configuration. Improved RFI/EMI immunity allows the 3300 XL Proximitor Sensor to achieve European CE mark approvals without any special mounting considerations. This RFI immunity also prevents the transducer system from being adversely affected by nearby high frequency radio signals. SpringLoc terminal strips on the Proximitor Sensor require no special installation tools and facilitate faster, highly robust field wiring connections.

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