Thermo Fisher Scientific CyberScan CON 1500 - Manual (Page 65)

Instruction Manual CyberScan CON 1500
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backwards- however, this term has been replaced by the term
“siemen”. Conductivity measurements are reported as Siemens/ cm,
since the value is measured between opposite faces of a cell of a
known cubic configuration. With most aqueous solutions, conductivity
quantities are most frequently measured in microSiemens per cm
(
µS/ cm) or milli-Siemens per cm (mS/ cm).
The CyberScan CON 1500 meter automatically converts
conductivity readings from micro or milli Siemens to other derived
units that are widely used. These are ppm TDS (total dissolved
solids), and Resistivity (ohm*cm).
Some users prefer the use of Resistivity units to describe their water,
particularly where high purity water is involved. The unit most often
used to describe Resistivity is Mohm*cm, which is simply the
reciprocal of conductivity (
µS/ cm). The chart below shows the
relationship between these units.
)
The CyberScan CON 1500 meter displays resistivity as ohm*cm (as
Ωohm on the display). Readings of 1 Mohm*cm and higher are
displayed as M Ωohm. Readings less than 1 Mohm*cm are displayed
k Ωohm.
.