Description
The 3300 XL 50mm 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 amaximum 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 mmTransducers 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 ofthe available target, the expected amount of rotor axial movement and the type of DE target that exists in the machine. lf 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 touse 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.
System Compatibility
The 3300 XL 50 mm probe comes in three case& thread configurations to physically replace all standard 7200 50 mm systems (including side and rear exit probes). The standard 7200 style mounting brackets are still available as accessories. In addition, a new bracket to adapt the probe to the 50 mm DE Integral transducer sliding mount base is also available. The Proximitor sensor has a 0.394 v/mm(10mv/mil) output that is identical to that of the 7200 and 50 mm DE Integral systems, which allows 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) mustbe replaced with 3300XL 50 mm components
Proximity Probe and Extension Cable
The 3300 XL50 mm probe is designed to survive the harshest steam turbine DE environments. lt can continually operate and maintain its accuracy in high temperatures upto 200°C(392°F), and can withstand intermittent high temperatures up to 250°C (482°F). The 50 mm probe has both a front and rear seal which, combined with the High Temperature FluidLoc cable (standard on all 50mm probes), prevent moisture from entering the probe tip. Special high-temperature ClickLoc connectors are also standard on the probe and extension cable. Each probe and cable comes with connector protectors and adisposable connector protector installation tool to ensure that the connectors remain free of contamination. The ClickLoc connector on the probe lead features a removable collar that facilitates routing the cable through tight clearances.
The 3300 XL 50 mm probe is available instraight exit case styles with ¼-20 English threads or M14x1.5 metric threads, including a locknut with predrilled safety wire holes. The side exit probe has two ¼-20 mounting holes in the rear of the probe case. For both straight exit and side exit probes the overall case diameteris 1.99 inches.
Proximitor sensor
The 3300 XL 50 mm Proximitor Sensor has the same advanced features as all 3300 XL Proximitor Sensors. lts thin design allows it to be mounted in either a high-density DlN-rail installation or a more traditional panel mount configuration. Improved RFl/EMl immunity allows the 3300 XL Proximitor Sensor to achieve European CE mark approvals without any special mounting considerations. This RFl immunity 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.
Proximitor Sensors are supplied by default from the factory calibrated to AISI 440 steel. Calibration to other target materials is available upon reguest.
Mounting Accessories
The correct operation of the transducer system must be initially verified during installation and periodically thereafter. This is done by physically moving the transducer to simulate the motion of the shaft collar. This requires a mounting bracket that allows the transducer system to slide relative to the shaft rotor and collar.
An optional Sliding Bracket can be ordered for the 50 mm Transducerf or both single transducer and complementary input applications. This mounting bracket allows you to verify the transducer system and gap the probes by sliding the transducer system through its linear range. The base plate of the sliding bracket is installed on the inner surface of the turbine case near the differential expansion collar. Probes are installed in the probe clamp that attaches to the sliding carriage. The sliding carriage slides onto and issecured to the base plate with bolts and safety wire. To verify and install the transducer, loosen the bolts securing the sliding carriage to the base plate and move the sliding carriage and probes. A verification kit with spindle micrometer can be temporarily secured to the base plate to provide a reference for axial verification measurements. The spindle micrometer measures the movement of the transducer system relative to the collar during these verification tests.
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 -24Vdc power supply, a10 k load, a Bently Nevada supplied AlSl 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 AlSl 4140 steel target.
Stock part list:
330878-90-00
330876-03-90-00-05
330876-01-90-00-05
330876-01-90-00-00
330876-01-10-00-05
330877-080-36-05
330879-01-01
330878-90-05
Post time: Sep-24-2025