Metal Samples MS2901E, Operator'S Manual

Page: 6 / 53

2
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 MS2901E measures an ER probe utilizing a high ‐ resolution, 16 ‐ bit measurement. This allows the
MS2901E to detect much smaller amounts of metal loss, thus responding faster to corrosion events and
upsets (compared to traditional ER meters.) At 16 ‐ bit resolution the MS2901E can measure metal loss
amounts as small as 0.0015% of the probe life.
Metal loss readings taken by the MS2901E are converted to a linearized 4 ‐ 20mA current loop output.
The 4 ‐ 20mA signal can be fed into a plant control system or other devices and scaled accordingly to
reflect metal loss. Then corrosion rates can be calculated based on the metal loss data over time. This is
covered in more detail on pages 11 and 12. More information on ER probes, their theory, selection, and
use can be found on our web site at http://www.alspi.com/erintro.htm .