Section 12750 - Additional Equipment Suggested but Not Required by the Department of Public Health(a) The use of an additional thermometer on each retort is advised to serve primarily as a check instrument, preferably located adjacent to the temperature recorder bulb.(b) An automatic temperature controller is recommended.(c) A safety valve of such size and capacity that it meets with the requirements of any board of mechanical engineers or any safety code in the State of California, and/or the California Industrial Accident Commission. It is recommended that the safety valve discharge be equal to or greater in capacity, than the retort steam supply line.Cal. Code Regs. Tit. 17, § 12750