The product of SJ2012 series is designed especially for monitoring the liquid level and temperature of liquid nitrogen and liquid helium in the container. With microcontroller embedded design and multi-channel data acquisition, it has one control output, one RS-232 digital output, flexible networking and remote centralized monitoring. Low liquid level, high temperature, sensor out of working and other failures could be alarmed. With many innovative designs, it could meet the demand of monitoring all kinds of cryogenic liquid containers.