3.1 The cup temperature measuring device, which conforms also to the specifications for the low-range temperature measuring device used in the Pensky-Martens flash tester, Test Method D 93, is frequently supplied by the temperature measuring device manufacturer with a metal or polytetrafluoroethylene ferrule intended to fit the collar on the lid of the flash tester. This ferrule is frequently supplemented by an adapter that is used in the larger-diameter collar of the Pensky-Martens apparatus. Differences in dimensions of these collars, which are immaterial in their effect on the result of tests, are a source of considerable unnecessary trouble to manufacturers and suppliers of instruments as well as to users.
3.2 Subcommittee E01.21 on Reference Material Planning, Proficiency Testing, and Laboratory Accreditation, has studied this problem and has established some dimensional requirements which are shown, suitably identified, in Fig. A1.1, Fig. A3.1, and Fig. A3.2. Conformity to these requirements is not mandatory but is desirable to users as well as suppliers of tag closed testers.
