330850-50-00 3300 XL 25 mm Proximitor Sensor

Overview

Place of Origin:	USA
Brand Name:	Bently Nevada
Model Number:	330850-50-00
Minimum Order Quantity:	1
Packaging Details:	Original new Factory Sealed
Delivery Time:	5-7 days
Payment Terms:	T/T
Supply Ability:	In stock

Quick Detail

Description

The 330850-50-00 3300 XL 25 mm Proximitor Sensor is a specialized high-performance signal conditioner designed for ultra-large displacement measurements. As a central element of the 3300 XL 25 mm Proximitor Sensor ecosystem, this device is engineered to provide unmatched precision in monitoring the critical expansion metrics of heavy rotating machinery. A complete transducer loop is formed by combining a separate 25 mm probe, a dedicated extension cable, and the 330780-50-00 3300 XL 25 mm Proximitor Sensor. By utilizing an optimized output sensitivity of 0.787 V/mm (20 mV/mil), the 3300 XL 25 mm Proximitor Sensor achieves an industry-leading linear range of 12.7 mm (500 mils). This extended measurement window allows the 3300 XL 25 mm Proximitor Sensor to capture significant positional shifts that standard proximity systems cannot monitor.

The primary application for the 330850-50-00 3300 XL 25 mm Proximitor Sensor is the measurement of differential expansion (DE) in mid-size to large-scale steam turbine generators. During the startup and thermal cycling of these massive machines, the turbine rotor and the machine stator (casing) grow at different rates due to their differing thermal masses. The 3300 XL 25 mm Proximitor Sensor provides the necessary reach to track these movements accurately, ensuring that the axial clearances between rotating and stationary components remain within safe operating limits. Without the robust data provided by the 3300 XL 25 mm Proximitor Sensor, turbines are at high risk of catastrophic internal contact during critical thermal transitions.

Applications

1.Differential Expansion (DE) Monitoring

The most prominent application for the 330850-50-00 is measuring differential expansion in large steam turbine generators. As turbines heat up, the rotor and the casing expand at different rates due to their mass and material properties. With a massive 12.7 mm (500 mils) linear range, this sensor can track these substantial movements accurately. This ensures that the axial clearances between rotating blades and stationary nozzles are maintained, preventing catastrophic internal rubbing during machine startup or load changes.

2.Casing Expansion and Thermal Growth Tracking

Beyond internal rotor movement, the 330850-50-00 is used to monitor "Shell Expansion" or "Casing Expansion." This involves measuring the absolute growth of the turbine housing relative to the machine foundation. Because the sensor offers an Amplitude Linearity of ± 0.25 mm over a wide window, it provides the precise feedback needed to ensure the turbine’s sliding feet are moving freely and not binding, which could otherwise lead to structural stress or misalignment.

3.Industrial Cabinet Integration

Featuring a Panel Mount design and a 5.0-meter system length, this Proximitor is specifically applied in centralized control environments. It is designed to be bolted onto internal mounting plates within weather-tight enclosures or instrument shacks located near the machinery. The A380 Aluminum case material provides the necessary durability for industrial environments, while the standard dimensions allow for clean, high-density installations alongside other 3300 XL series monitors.

Specifications

Competitive Advantage

1.Industry-Leading 12.7 mm Linear Measurement Range

The most significant competitive advantage of the 330850-50-00 is its massive 12.7 mm (500 mils) linear range. Compared to standard 8 mm sensors which only offer 2 mm of range, this 25 mm Proximitor provides over six times the measurement envelope. This is a critical advantage for monitoring differential expansion on large steam turbines, as it allows the system to track enormous thermal growth without the signal "flatlining" or going out of range.

2.Exceptional Thermal Stability and Accuracy

In the demanding environment of a power plant, thermal drift can lead to false data. The 330850-50-00 maintains a tight Amplitude Linearity of ± 0.25 mm (± 10 mils) across its entire 12.7 mm range. This precision, combined with an operating temperature range of -51°C to +100°C, ensures that the displacement data remains accurate from cold start-up to full-load operation, providing operators with high-confidence safety data for critical decision-making.

3.Rugged A380 Aluminum Construction

Unlike smaller sensors that use plastic or lightweight composite housings, this Proximitor features a robust A380 Aluminum case. This provides superior electromagnetic interference (EMI) shielding and physical protection against the vibrations and accidental impacts common in industrial settings. With a Shock Survivability of 5,000 g peak, the internal electronics are exceptionally well-protected, ensuring long-term reliability even when mounted directly on or near high-vibration machinery frames.

4.Seamless Interchangeability and Calibration-Free Maintenance

As part of the 3300 XL family, this Proximitor supports full component interchangeability. Competitive systems often require "matched sets" where the probe and sensor must be calibrated together in a lab. The 330850-50-00 eliminates this need; any 3300 XL 25 mm probe can be paired with any 3300 XL 25 mm Proximitor of the same electrical length (5.0 meters) without manual recalibration. This significantly reduces downtime and simplifies spare parts management.