ABB AWT420 Operating Instruction page 99

AW T4 2 0 | U N I V E R S A L 4 - W I R E , D U A L- I N P U T T R A N S M I T T E R | O I/A W T4 2 0 - E N R E V. B
The conductivity analyzer utilizes the computational ability of a
microprocessor to achieve ultra-pure water temperature
compensation using only a single platinum resistance
thermometer and mathematically calculating the temperature
compensation required to give the correct conductivity at the
reference temperature.
Temperature °C
Curve A – Theoretical ultra-pure water conductivity
Curve B – High purity water conductivity
(ultra-pure water with slight impurity)
Figure 34 Ultra-pure water temperature compensation
µS cm
–1
99