12.2 Automated Apparatus:
12.2.1 Check that the cooling bath is operating and has
reached the temperature required as specified in the manufacturer’s instructions.
12.2.2 Pour the filtered specimen (see Section 9) into the
clean and dry test jar to the 45 mL mark.
12.2.3 Close the test jar with the stopper (see 6.1.7) carrying
the pipet with filter unit (see 6.1.8) and the platinum resistance
thermometer. 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 in contact with the
side of the test jar or the filter body.
NOTE 9—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.