A-A-54520
Shall consist of a pointed metal stem that is attached to a metal case with a calibration nut. The stem, case, and calibration nut shall be fabricated from corrosion-resisting steel. The stem shall be positioned perpendicular to the center of the base of the case. The stem shall house a bimetallic heat-sensitive element.
Shall be supplied with a pointed metal stem with an exposed length of 4-3/4 to 5-1/4 inches. The outside diameter of the stem shall be at least 1/8 inches when measured at the midpoint of its axial length.
Shall be supplied with a metal case that encloses a graduated dial, a black pointer, and a protective window. The window shall be securely sealed to the case to provide a watertight thermometer. The dimensions of the case shall allow for at least a 7/8 inch diameter field view of the dial under the window.
Shall be supplied with an optically clear glass or plastic window. The dial crystal material shall be capable of being subjected to a 225 degree (F) temperature for a one hour period without exhibiting any evidence of discoloration or deformation.
Shall be supplied with a circular dial with graduations and numerals that are black on a white or silver background. The 0 to 220 degree (F) temperature range shall extend around the circular face to cover at least a sector formed by a 300 degree arc. A minimum 20 degree arc sector shall separate the positions for the 0 and 220 degree (F) readings. The graduations shall be divided in 2 degree (F) increments with each 10 degree (F) increment longer than the other increments. At least every 20 degree (F) increment shall include the appropriate Arabic number marking for a direct temperature reading. The graduation markings shall be permanent and clear. The dial shall also be marked to include the model number and name or registered trademark of the manufacturer or supplier. As an alternate the model number may only be indicated on the printed instructions that are to be supplied with the thermometer.
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