PETROSYSTEM Srl Via Gaspare Spontini, 29/4 - 00043 Ciampino (Roma) – Italy Tel:+39 06 7932.1621 Fax:+39 06 7932.1160 Email: [email protected] web: www.petrosystem.it Electrical Resistance (ER) probes are the mainstay of most intrusive corrosion monitoring applications, providing on-line data about corrosion rates that may be used to check the efficacy of corrosion inhibition or detect changes in underlying process corrosivity. Linear Polarisation Resistance (LPR) is a fast responding intrusive method for measuring changes in the corrosivity of aqueous solutions. In expert hands LPR is an extremely effective electrochemical tool but care must be taken to select appropriate applications as the presence of oil may prevent effective operation. The comprehensive Cormon products range for these techniques includes compact, intrinsically safe transmitters and data loggers and a wide range of probes for high, medium and low pressure use. ELECTRICAL RESISTANCE PROBE ELECTRICAL RESISTANCE probes and ER instruments are used for measuring metal loss due to corrosion/erosion in process applications. Corrosion of the exposed Sample element is measured as a change in its electrical resistance. The method is usable in almost any environment, being independent of the process properties. ER is not recommended for use in sour service if conductive (iron sulphide) scales are likely to be deposited. Data is usually presented as a uniform rate of metal loss for the period of interest in mpy or mmpy. Electical Resistance Probes