P-29, r. 1 - Regulation respecting food

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11.7.9. Equipment used in low-temperature slow pasteurization must ensure
(1)  continuous agitation of the dairy product so as to maintain uniform temperature;
(2)  protection of the dairy product against any source of contamination by means of a lid;
(3)  throughout the pasteurization process, thermometer monitoring of the dairy product temperature and the temperature of the air between the dairy product and the lid; and
(4)  continuous recording of the dairy product temperature with a thermograph or equivalent device.
The temperature of the air between the dairy product and the lid taken at a distance of between 2.5 cm above the dairy product and 5 to 9 cm below the lid must be at least 3°C higher than the minimum pasteurization temperature.
O.C. 741-2008, s. 15.