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1 Note "X" indicates need for clearance to accommodate differential thermal expansion.
2 A tie wire between the central verticle wires is optional at the lower end of the support.
3 using the thermocouple,djust the controls to abtain a temperature gradient of less than 50°C between the position of the top of the test specimen and 50mm below this position
4 Resite the thermocouple 25 mm bellow the top of the test specimen.
5 The adjustment of these independent controls should be such that the preheater raises the incoming air temperature at the basic of the column to approximately that of the column itself.
6 Using a test specimen holder preheated to the column temperature
7 with the thermocouple positioned so that it is immediately adjacent to,but not touching,the test specimen
8 use of period other than 240s±10s between introduction of the test specimen and the initial application of the igniter in accordance with A.7 may lead to non-comparable results when testing materials for which the FT is sensitve to the period of exposure to elevated temperature .
record whether the flame is extinguished before either of the relevant criteria from table 3 of ISO4589-2.
9 continue repeating the procedure from A.3 to A.11 inclusive until the FT is established, to within an increment of 5°C,as the lowest column temperature ,as recorded in A.5,at which the test specimen exceeds at least one of the test criteria.
10 express it as the mean value when rounded to the nearest 1°C,with an exactly intermediate result being rounded down-wards.
最后由 静静o(∩_∩) 于 2008-07-15 14:38:25编辑
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楼主 Date: 2008-07-14 20:26:22
房子出现了
