High temperature thickness gauges
Thickness gauges are often used to measure changes in thickness of a wall over time. An example would be measuring changes in thickness of a pipe wall to monitor corrosion inside the pipe.
Measuring pipes at high temperatures (over, say, 100 °C) can be a practical problem for a corrosion tech. They have to go to each required location and, using a hand-held device, briefly touch the spot to be measured and collect data. This can be both uncomfortable and dangerous depending on just how hot the pipe and surrounding area are. And it takes repeated measurements in the exact same place to gather information about changes due to internal corrosion. Alternatively, a transducer could be mounted permanently on the pipe and simply checked periodically, either by hand or remotely. While checking by hand is a little easier with a permanently mounted device, it still requires a trip to the location by a person. Checking remotely eliminates the environmental hazards and round trip, but requires substantial cabling.
In the real world of processing plants, refineries, mills, and the like, pipes in corrosion prone areas can get much hotter than 100 °C. Bifrost Engineering has designed and built ultrasonic transducers capable of operating at temperatures of greater than 400 °C. Our lowest standard products are rated to 150 °C (300 °F) and have a resolution of at least 0.001” (see table below).M
|Product||Continuous use temperature||Resolution|
|HT150-5||150 °C (302 °F)||0.0001” (0.00254 mm)|
|HT260-5||260 °C (500 °F)||0.0005” (0.0127 mm)|
|HT400-5||400 °C (752 °F)||0.001” (0.0254 mm)|
Our standard size transducer is 0.650” diameter x 0.750” long. It can be fitted with any connections from bare wires to BNC, SMA, LEMO, or just about anything else. Housings are either Ultem, Celazole, or Invar.