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B. ER Sensing Elements
Electrical resistance probe elements are offered in a variety of thicknesses and geometries. The most
common are illustrated below:
Figure 7. Element Styles
Tubular loop elements are constructed from thin-walled tubing. Their small cross-section allows fast
response at low corrosion rates.
Wire loop elements, constructed of solid wire, provide a good compromise between sensitivity and long
life. They are typically used for systems exhibiting moderate corrosion rates (5-20 mpy).
Cylindrical elements are made from hollow cylinders and are extremely robust. They are widely used in
high temperatures and high flow rate conditions. They tend to be sensitive to noise and somewhat
sluggish in response. Consequently, they are only recommended for moderate to high corrosion rates
(20-50 mpy).
Flush elements are designed to be located flush with the corroding surface of the vessel/pipe, conse-
quently, most closely simulating true corrosion rates. The flush element is useful in high flow regimens
and operating conditions where internal obstructions are not permissible, e.g., pigged pipelines.
Wire Loop Cylindrical Tube Loop Flush