customers often measure the resistivity of ultrapure water and find that the resistivity is more than 10 megohms during online circulation measurement, but when sampled and measured in a glass, it suddenly becomes smaller. Why is this?
, for example, the resistivity measured online below is 12.64 MΩ * CM.
static measurement: 6.73 MΩ * CM
this is mainly in a non-vacuum state, soluble gases in the air, such as CO2, will dissolve into pure water, resulting in an increase in conductivity and a decrease in resistivity.
Therefore, when measuring this ultra-pure water, it is necessary to ensure the flow-through installation and the vacuum state of the tank inside.
Ayi Technology is the process automation instrument expert around you!