Electrical resistance (ER)

General Info

Electrical Resistance (ER), along with corrosion coupons, is one of the oldest industrial corrosion monitoring techniques. However, the popularity of ER systems has diminished over the last decades in favor of non-intrusive, online ultrasonic thickness monitoring (UT). Nevertheless, ER still possesses certain advantages and, when used properly, can provide accurate and reliable information about process stream corrosivity.

Installation

• Similar to LPR, the retractable system is also the most popular solution for installing ER probes in refining environments. The recommended mounting system consists a flange connection (see Figure 1). Threaded probe mounting, often using a 1" NPT nozzle, is not always recommended, as vibrations from process pipes or equipment can loosen the threaded connection .

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• ^{1 - Grafoil® is a registered trademark of NeoGraf Solutions.}
• ^{2 - https://www.alspi.com/erintro.htm.}