COFFEE ROASTER: 1.programmable logic controller(PLC)- it can memorize 20 ways of roasting methods set by user. The user can roast by setting timer,temperature orboth. 2.human/computer interface(HMI)- just control by touch on computer screen. 3.electrical meallic tubing(EMT)- avoid damsge from rat. 4.temperature of input gas and coffee grain can be shown all the time.
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