changed during the test. Adjust the apparatus in such a way that
the bottom of the filter unit (see 6.1.8.2(e)) rests on the bottom
of the test jar, and position the thermometer so that its lower
end is 1.5 6 0.2 mm above the bottom of the test jar. Take care
to ensure that no part of the thermometer is not in contact with
the side of the test jar or the filter body.
NOTE 7—The precise positioning of the thermometer in the test jar is a
critical parameter of this test method. The position of the lower end of the
thermometer above the bottom of the test jar can be indirectly measured
by marking the stem of the thermometer flush with the stopper (see 6.1.7)
when the lower end of the thermometer is just touching the bottom of the
test jar, and then pulling the thermometer up such that the reference line
is 1.5 6 0.2 mm above the top of the stopper.