Conductivity is an inherent property of water that measures the electrical current flowing through the ionic species in a solution; therefore, the higher the concentration of ions, the greater the likelihood of electrochemical reactions with the metal surface of the system that may precede corrosion.

However, even considering high purity water, operational conditions may also have an impact in the way conductivity may vary:

Low temperature
 – if pressure rises, conductivity drops down.

High temperature
– If pressure rises, conductivity rises
– If pressure drops, conductivity rises

Constant Temperature

– If pressure is constant, conductivity drops
– If pressure is constant and conductivity increases, then consider this:
– Presence of air in the sampling
– Saturation of resins
– Decompensation in the dosing
– Hideout (check chemical treatment)

That is of special importance during commissioning due to the transient nature of the operation at this stage. Follow Pressure (red) VS Conductivity (blue)