11.7.11. A chart of the data recorded by a thermograph or equivalent device must be made for each day of use. The chart must(1) contain curves that do not overlap and that represent real time;
(2) contain the date, identification of the equipment and operations for which it was used and name of the equipment operator;
(3) show a comparison between the temperature reading of the indicating thermometer and the temperature recorded by the thermograph or equivalent device during the holding period during which the dairy product is maintained at the required temperatures during the heating process; and
(4) show the temperature of the airspace referred to in subparagraph 3 of the first paragraph of section 11.7.9 at the start and end of the holding period.
Charts must be retained at the dairy plant for at least 12 months after the date on which the data are recorded or for at least 24 months if the dairy product prepared can be stored for longer than 12 months.