Meggitt is a leading provider of pressure and vibration sensors as well as signal conditioners for demanding applications in the power generation industry. Our sensors excel in high temperature, high stability in hostile environments including nuclear power plants. Endevco continues to develop new technologies for this dynamic market.
|TYPICAL APPLICATIONS||REPRESENTATIVE MODELS|
|Combustion chamber performance testing||522M37A, 522M17|
|Turbine vibration measurements||F3/6243M, 6237M70, 6233C, 2276, 2248M1|
|Pipe vibration measurements||2273AM1, 7703A, 522M37A, 2771C|
|Oil drilling tool testing and monitoring||7703A, 7704A, 2221F|
|Turbine exhaust pressure measurements||522M37A, 522M17|
|Monitoring in radiation environments||2280, 2273AM20, 6243M, 3097M1|
|Loose parts monitoring||6233C, 6243M, 6917B, 2771C|
|Wind turbine development and testing||5220B-100, 25A, 41A, 42A, 43A, 46A, 8515C|
Turbine vibration measurement
As turbines operate at elevated temperatures, this makes the operating temperature of the accelerometers a primary selection criteria. The highest temperature unit offered by Meggitt is the 6237M70 with an operating range to 1200 ͦF. Included with this accelerometer is a mounting screw (EH471) and hardline cable. There are 3 accelerometers with slightly lower maximum operating temperatures (900 ͦF) whose mounting configurations differ. The 6233C, features ARINC 3 point mounting, the 2276, stud mounting and the 2248M1 stud or flange mounting (2248). All these PE accelerometers require no external power supply. If needed, an optional charge amplifier (2721B) or in-line charge converter (2771C) is available.
Monitoring in radiation environments
As of 2016, there were about 450 nuclear power plants in existence globally with 60 more under construction. Accelerometers are placed at the top and bottom of the reactor vessel to warn operators of excessive vibration of the overall system and its components. Ability to withstand high temperatures and radiation are major considerations in accelerometer selection. Meggitt offers a wide selection in many different configurations. The 2273AM1 and 2273AM20 are available with top and side connectors respectively and operate to 750 ͦ ͦF while the 7703A and 7704A operate to 550 ͦF. For highest temperature (900 ͦF) operation, select the 2276. This device features Isobase® construction that provides mechanical isolation of bending motion from the mounting base.
Wind turbine development and testing
Depending on their size, wind turbines can have up to 8000 parts. Those areas where accelerometers are most often used in development and on-side testing of wind turbines include the main shaft, main bearings, gearbox shaft bearings and gear mesh. The preferred technology to use is IEPE with TEDS capability as it provides both high output, quick traceability and improved diagnostics/troubleshooting. Suggested products include the 41A, 42A, 43A, and 46A. The 46A is unique as it is a pod accelerometer that fits into a wide range of mounting blocks. For aerodynamic measurements of pressure on the wind turbine blades, the ultra low profile of the Model 8515C makes it a logical choice. Further, this piezoresistive miniature pressure sensor has a high output and low power supply requirements.