149 6 0.5 mm from the bottom of the pipet (see Fig. 6). It shall
be connected to the filter unit (see 6.1.8.2).
6.1.8.2 A Filter Unit (see Fig. 7), containing the following
elements:
(a) A Brass Body, with a threaded cavity that houses the wire
mesh holder. The cavity shall be fitted with an O-ring of
oil-resistant plastics. The internal diameter of the central tube
shall be 4 6 0.1 mm;
(b) A Brass Screw Cap, to connect the upper part of the body
of the filter unit (see 6.1.8.2) to the lower part of the pipet (see
6.1.8.1) to ensure a leak-free joint. An example of satisfactory
connection is shown in Fig. 7.
(c) A Disc, 15 6 0.1-mm diameter, of plain weave stainless
steel wire mesh gauze with a nominal aperture size of 45 µm.
The nominal diameter of the wire shall be 32 µm, and the
tolerance for the size of an individual aperture shall be as
follows:
149 6 0.5 mm from the bottom of the pipet (see Fig. 6). It shallbe connected to the filter unit (see 6.1.8.2).6.1.8.2 A Filter Unit (see Fig. 7), containing the followingelements:(a) A Brass Body, with a threaded cavity that houses the wiremesh holder. The cavity shall be fitted with an O-ring ofoil-resistant plastics. The internal diameter of the central tubeshall be 4 6 0.1 mm;(b) A Brass Screw Cap, to connect the upper part of the bodyof the filter unit (see 6.1.8.2) to the lower part of the pipet (see6.1.8.1) to ensure a leak-free joint. An example of satisfactoryconnection is shown in Fig. 7.(c) A Disc, 15 6 0.1-mm diameter, of plain weave stainlesssteel wire mesh gauze with a nominal aperture size of 45 µm.The nominal diameter of the wire shall be 32 µm, and thetolerance for the size of an individual aperture shall be asfollows:
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