330180-50-20 - Proximitor sensor

SPECIFICATIONS

Part Number: 330180-50-20
Manufacturer: Bently Nevada
Product Type: 3Proximitor sensor
Length: 8.5 metres
Country of Manufacture: USA (United States)

Functional Description

330180-50-20 is a Proximitor sensor manufactured by Bently Nevada. It is a part of their 3300 XL Transducer System. This system is designed for advanced vibration and position monitoring in industrial machinery, particularly in large, high-speed rotating equipment such as steam turbines. The 3300 XL system uses an eddy current transducer principle, which offers non-contact measurements of displacement and position, making it ideal for applications where high precision and reliability are essential.

Components of 3300 XL Transducer System

The 3300 XL system comprises a 50 mm probe, an extension cable, and the 3300 XL 50 mm Proximitor Sensor itself. This combination forms an integrated solution for monitoring critical components in large machinery. The system is known for its large diameter coil, which offers a maximum linear range of 27.9 mm (1100 mils), making it the longest linear range available in the Bently Nevada eddy current transducer line. This extensive range is particularly beneficial when measuring differential expansion (DE) or rotor expansion (RX), especially in large steam turbine generators.

Measuring Differential Expansion (DE)

Differential Expansion is a key measurement used to track the relative movement between the rotor and stator. The 3300 XL 50 mm Transducer System is used with two proximity transducers positioned to measure the expansion between the components. The typical setups for this measurement include:

• Two transducers observing the same side of a collar: This setup works when the rotor and casing alignment and the expected movement are within a range that the 27.9 mm (1.1 inches) can cover. It provides redundant measurements, enhancing the reliability of the data.
• Two complementary input transducers observing opposite sides of a collar: This arrangement effectively doubles the measurable range of differential expansion to 55.8 mm (2.2 inches). This setup is preferred when the total expected differential expansion exceeds the 27.9 mm range of a single transducer but is still under 55.8 mm.

The decision on which configuration to use depends on factors such as:

• Size of the available target (e.g., the collar or ramp),
• Expected rotor axial movement (the amount of differential expansion anticipated),
• Type of DE target (the surface or geometry being measured).

Configuration Considerations for Optimal Performance

• Collar Height: The height of the collar can affect how effectively the transducers can measure the differential expansion. A sufficient collar height ensures that the probe can reliably detect changes in position.
• Required Measurement Range: If the total measurement range required is under 27.9 mm (1.1 inches), using two transducers observing the same side of the collar is the preferred configuration for redundant measurements. This setup provides sufficient accuracy and reliability for typical applications.
• Wider Measurement Range: For scenarios where the measurement range exceeds 27.9 mm and falls between 28 mm to 56 mm (1.1 to 2.2 inches), the complementary arrangement (transducers on opposite sides of the collar) should be used. This setup effectively doubles the range and ensures that larger movements can be accurately tracked.

Benefits of Proximitor Sensor

• High Precision: The long linear range of the 3300 XL system provides precise measurements, even in high-expansion environments such as large steam turbine generators.
• Non-Contact Measurement: Using the eddy current transducer principle, the 3300 XL 50 mm Transducer System allows for non-contact measurement of key components, reducing wear and tear on equipment and ensuring longevity.
• Redundancy and Reliability: The system can be configured for redundant measurements, providing a high level of data integrity and system reliability.
• Scalable: The system’s design supports the use of multiple transducers, allowing it to be scaled for various monitoring applications, from simple setups to more complex, multi-transducer systems.

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FREQUENTLY ASKED QUESTIONS

What is 330180-50-20?
It is a 3300 XL Standard Proximitor sensor manufactured by Bently Nevada.

Can the Proximitor Sensor be used with any type of machine?
It is most effective in large machines where thermal expansion is a concern, like steam turbines. It is specifically designed for machines that experience high rates of expansion and require precise measurement of axial movements.

How many transducers can be used with the 3300 XL 50 mm system?
The 3300 System can support multiple transducers, with typical setups involving two transducers for measuring differential expansion. For redundant measurements, two transducers can observe the same side of a collar, or complementary transducers can be placed on opposite sides of the collar to effectively double the measurable range.

What is the maximum measurable range of differential expansion with this sensor?
The Transducer System can measure differential expansion over a range from 0 mm to 27.9 mm (1.1 inches) with a single transducer. If a wider range is needed (between 28 mm and 56 mm), the system can use two complementary transducers, effectively doubling the range.