Metal Samples Company MS4500E-HC, Operator'S Manual, Page: 4 / 34

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Because they are designed to corrode, ER probes are sacrificial in nature. Each ER probe will have a
finite life that is based on the element thickness. ER probes are available in a number of geometries
and thicknesses designed to suit a wide variety of applications. Table 1 lists the common ER element
options available from Metal Samples and the effective life of each.
Element Type Compatibility Thickness
Probe Life
(Span)
Tubular Loop Compatible
4 2
8 4
Wire Loop Compatible
40 10
80 20
Flush (Small)
Compatible
4 2
8 4
20 10
Cylindrical Preferred
10 5
20 10
50 25
Flush (Large) Preferred
5 2.5
10 5
20 10
40 20
Table 1. Standard ER Probe Elements
The MS4500E-HC High Resolution ER Data Logger measures an ER probe utilizing a high-resolution, 16-
bit measurement. This allows the unit to detect much smaller amounts of metal loss, thus
responding faster to corrosion events and upsets. At 16-bit resolution the
MS4500E-HC ER Data
Logger can measure metal loss amounts as small as 0.004% of the probe life. For highly sensitive
probes such as the 5-mil large flush shown above, that results in a detection limit of less than one
angstrom.