YOKOGAWA SC72 - 7 Measuring Principles of this Instrument; What Is Conductivity

IM 12D03D02-01E
7-1
7. Measuring Principles of this Instrument
7. Measuring Principles of this Instrument
7.1 What Is Conductivity?
Conductivity of a solution is dened as the ability of the solution to conduct electric
current. It is the reciprocal of the resistance between two sensors (both of areas 1 m
2
)
at a distance of 1 m apart in the solution.
1 S/cm = 100 S/m
Figure 7.1 shows the conductivities of typical solutions.
Pure
water
Sea
water
Deionized
water
Distilled
water
Reservoir
water
Strong acid and
alkali solutions
Salt water
(1 to 27%)
Organic
acid
0.1 1 10 100 1000 [µS/cm]
0.01 0.1 1 10 100 [mS/m]
1 10 100 1000 [mS/cm]
0.1 1 10 100 [S/m]
Figure 7.1 Conductivity of Typical Solutions