330878-50-05

Features:

• Interface Between the 50 mm Probe/Extension Cable and 3500 Rack Backplane
• Combines Capability of Eddy Current Signal Conversion with Extended Linear Range Measurement
• Operates in Conjunction with the 3500/45 Position Monitor and Standard 3500 Monitors

The 330878-50-05 operates as the 50 mm Proximitor Sensor in the 3300 XL Transducer System, providing reliable eddy current signal conditioning for differential expansion measurements in large steam turbine generators. The 330878-50-05 continuously processes signals from the 50 mm probe and extension cable with a total system length of 5.0 meters (16.4 feet), converting eddy current variations into precise displacement measurements with a maximum linear range of 27.9 mm (1100 mils). Seamless signal transfer is standard with the 330878-50-05, however using an optional Redundant Measurement Configuration with dual 330878-50-05 sensors observing the same collar side will allow seamless validation in critical turbine protection applications. The 330878-50-05 has made improvements in several areas over previous proximitor designs in addition to incorporating universal panel mounting capability within the 3500 rack or standalone installations.

The 330878-50-05 provides essential signal conditioning functions common to the entire transducer system, and is a critical component of the differential expansion monitoring path, directly affecting the proper, normal operation of the overall turbine protection system. One or two 330878-50-05 proximitor sensors are required per measurement point depending on the desired redundancy level and required measurement range. The 330878-50-05 occupies a compact form factor in the system architecture and is always located in proximity to the probe installation point, with panel mount configuration for secure industrial placement in Slot 0 or designated proximitor mounting positions.

For Dual Redundant Differential Expansion applications requiring ranges from 28 mm to 56 mm (1.1 to 2.2 inches), the 3300 XL System requires a second 330878-50-05 proximitor sensor installed in the complementary configuration observing opposite sides of the collar. In addition to standard single sensor operation, the redundant configuration also performs automatic range extension. The 330878-50-05 dual sensor configuration executes complementary measurement using the internal circuitry specified in the proximitor options. Using this method, the redundant sensor system continually monitors the health of both 330878-50-05 units. If the system detects that the primary 330878-50-05 is no longer providing stable output (outside configured linear range/tolerance levels of 27.9 mm), it will automatically transfer the monitoring function to the secondary 330878-50-05 and place an event in the System Event List.