GB/T 3 2710.2 - 2 016 "Safety Specifications for Environmental Test Instruments and Equipment, Part 2: Low Temperature Thermostatic Cycling Devices" defines the safety requirements for low temperature thermostatic cycling devices, high and low temperature thermostatic cycling devices and chill down water circulation devices. The standard covers electric shock, electric burns, mechanical hazards, flame spread, excessive temperature, fluid pressure, radiation effects (e.g. laser, sound pressure and ultrasonic pressure), gas release, explosion, implosion, and biological and chemical hazards, but does not address equipment function, performance, Encasement effectiveness, electromagnetic compatibility, explosion protection measures and maintenance personnel protection. It is suitable for immersion cryogenic thermostatic circulation devices with external circulation function, and is suitable for related equipment in laboratories and industrial processes. At the same time, the equipment should comply with the relevant standards of industrial automation products. Normative reference documents include GB 4208-2008 "Protection level of enclosure (IP code) " and GB 4706 series standards.