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OCR for page 28
APPENDIX B
MEASUREMENT OF TEMPERATURE DISTRIBUTION ON HOT PLATE
A suitable piece of apparatus for measuring the tem-
perature distribution across the hot plate is illustrated
in Figure B-1 . The measuring element is to consist of a
find thermocouple with the junction flattened and brazed to
a disc of copper or brass foil 5 mm in diameter. This is to
be placed at a measuring point and covered with a piece of
insulating material (asbestos mi11board) 5 mm in thickness
and 10 to 15 mm in diameter and held by a vertical glass
rod which moves freely in a tubular guide and to which a
fixed load is applied.
Temperature measurements are to be made along two dia-
meters at right angles and at points 20 mm apart and record-
ed as in Figure B-2. The thermocouple must be allowed to
reach a steady temperature at each point.
The measured surface temperature usually will be lower
than the set point temperature of the pa ate depending on
the detailed construction of the thermocouple. This is im-
material and can be ignored. The essential requirement is
an accurate measurement of temperature differences rather
than of absolute values.
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Plate Temperature: 350° Scale 1:1
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FIGURE B-2
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Representative terms from entire chapter:
hot plate
