330878-90-00 Bently Nevada 50 mm Proximitor Sensor

Description:

The 3300 XL 50 mm Transducer System consists of a separate 50 mm probe, an extension cable, and a 3300 XL 50 mm Proximitor Sensor. The large diameter coil gives this system a maximum linear range of 27.9 mm (1100 mils), the longest linear range of our eddy current transducer line. This linear range makes the 3300 XL 50 mm Transducer System ideal for measuring the differential expansion (DE) or rotor expansion (RX) of large steam turbine generators that results from the difference in growth rates between the turbine rotor and the machine stator (casing).

Measuring Differential Expansion
The Differential Expansion measurement is made by using two proximity transducers that observe a collar or ramp some distance from the thrust bearing. Typical transducer mounting arrangements that require the 3300 XL 50 mm Transducer’s long linear range include:

• Two transducers observing the same side of a collar.
• Two complementary input transducers observing opposite sides of a collar, effectively doubling the measurable DE range.

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. If the collar height is sufficient and the required total measurement range is less than 27.9 mm 1.1 inches, the preferred configuration for redundant measurements is to use two transducers observing the same side of a collar. When 28 mm to 56 mm (1.1 to 2.2 inches) of total range are required, install the transducers in a complementary fashion on opposite sides of the differential expansion collar or other target material

Specifications
Unless otherwise noted, the following specifications are for a 3300 XL 50 mm Proximitor Sensor, extension cable and probe between 0°C and +45°C (+32°F to +113°F) at a maximum altitude of 2000 meters, with a -24 Vdc power supply, a 10 kΩ load, a Bently Nevada supplied AISI 4140 steel target that is 102 mm (4.0 in) diameter or larger. The system accuracy and interchangeability specifications do not apply when using a transducer system calibrated to any target other than a Bently Nevada AISI 4140 steel target.

Features:

• Ideal for Compression Systems, Speed Measurements, and Fluid-Film Bearing Machines
• Extended Temperature Range Applications
• Complete Interchangeability of Units and Cabling
• Backwards Compatible with Other Non-3300 XL Series Transducer System Components

A 3300 XL 8 mm Proximitor Sensor, extension cable, and 8 mm probe between +18 and +27 °C, with a -24 Vdc power supply, a 10 k load, an AISI 4140 steel target, and a probe gapped at 1.27 mm. 

Parameters:
Product Number: 330878-90-00
Measurement Range: 2 mm to 50 mm
Frequency Response: DC to 10 kHz (-3 dB)
Output Signal: -24 VDC to -28 VDC
Temperature Range: -35°C to +177°C (-31°F to +351°F)
Operating Voltage; 24 VDC, regulated
Accuracy : ±1% of full-scale range
Environmental Rating: IP67

Datasheet Link:

330878-90-00 Bently Nevada 50 mm Proximitor Sensor PDF Datasheet