Overview
Manuals
Principle
Technical
Applications
Features:
- 3300 XL 25 mm Proximitor Sensor
- 3300 XL 25mm Proximity Transducer System
- The 0.787 V/mm (20 mV/mil) output gives this system a linear range of 12.7 mm (500 mils)
The 3300 XL 25 mm sensor system consists of a separate 25 mm probe, an extension cable, and a 3300 XL 25 mm proximity sensor. An output of 0.787 V/mm (20 mV/mil) gives the system a linear measurement range of 12.7 mm (500 mil). Based on this linear measurement range, the 3300 XL 25 mm sensor system is suitable for measuring differential expansion (DE) in medium to large-sized steam turbine generators caused by differences in the growth rates of the turbine rotor and stator (casing).
The system uses two sensors: at least one sensor measures a ramp on the rotor, and the other sensor measures another ramp or a different location on the rotor to compensate for radial movement. This configuration introduces some measurement error but allows for measuring a longer total differential expansion distance than complementary measurements.
The 330850-51-05 Bently Nevada 3300 XL 25 mm Proximitor Sensor may still be available for purchase and support from Moore Automated Company beyond End-Of-Life (EOL) by the manufacturer (OEM).
Bently Nevada 330850-51-05 3300 XL 25 mm Proximitor Sensor Manuals(Datasheets), Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
Criteria for selecting the mounting method include the available target size, the expected rotor axial displacement, and the type of existing DE target in the machine (sleeve-type or ramp-type). If the sleeve height is sufficient, a configuration with two sensors observing the same side of the sleeve is preferred. These two sensors can provide redundant measurements.
1. Linear Range: 12.7 mm (500 mils), starting distance approx. 1.3 mm (50 mils).
2. Sensitivity: 0.787 V/mm (20 mV/mil) when used as a complete system.
3. Power Requirements: Requires -17.5 V DC to -26 V DC (unbaffled) or -23 V DC to -26 V DC (baffled).
4. Construction: Constructed from A380 aluminum alloy.
1. Differential Expansion (DE) Monitoring: Measures the axial positional change of the rotor relative to the casing due to thermal expansion during startup and operation.
2. Mechanical Protection: Provides continuous data to identify potential mechanical failures and prevent damage to critical equipment such as steam turbines and large generators.
3. Equipment Condition Monitoring: Tracks long-term trends in mechanical health, helping operators predict failures and schedule preventative maintenance.
4. Single-sided (Redundant): Two probes observe the same side of the same collar to provide redundant measurement channels.
