Hunan Red Star Frozen Food Co., Ltd. mainly engaged in fruit, meat products frozen and refrigerated, bulk food, pre-packaged food, etc. Frozen food is mainly used in refrigerants freon and ammonia, ammonia has strong toxicity, in the event of an open flame can also explode. When Freon encounters an open fire or high temperature, it will decompose harmful gases to the body and endanger human health. The project adopts ASD5300C, ASD5310 gas detector and JB-TB-ASD5120 controller.