低温设备通常有两级制冷系统,第一级制冷系统的制冷量吸收第二级制冷系统放出的热量。保证第二级制冷系统有足够的低温制冷。一般情况下,两级制冷系统不是同时起动。第一级先起动,第二级用延时器延时一定时间后,或者,用温控器监护第一级制 Low-temperature equipment is usually two-stage refrigeration system, the refrigeration system of the first stage absorbs the heat released by the second-stage refrigeration system. To ensure that the second-stage refrigeration system has sufficient low-temperature refrigeration. Under normal circumstances, two-stage refrigeration system is not started at the same time. The first stage first start, the second stage delay with a delay after a certain period of time, or, with the thermostat monitoring the first level