Steamline offers Self Operated Temperature Control - SOTC Systems. Steamline supplies equipments and systems for steam generation & distribution, steam utilization and condensate Recovery. Self Operated Temperature Control - SOTC Systems is a fully mechanical system. Self Operated Temperature Control - SOTC Systems is an Ethernet/ Internet based data acquisition systems at an incredible price point. This system is an accurate PID controlled pneumatic control valve systems - inclusive of sensors, controllers and valves.