NOTE 2— the air ionizer may be omitted provided that, when weighing a membrane filter, it is placed on the pan so that no part protrudes over the edge of the pan. NOTE 3—Air ionizers should be replaced within 1 year of manufacture.
NOTE 2— the air ionizer may beomitted provided that, when weighing a membrane filter, it is placed onthe pan so that no part protrudes over the edge of the pan.NOTE 3—Air ionizers should be replaced within 1 year of manufacture.