PID Auto tune controller with universal input (thermocouple either grounded or ungrounded), RTD sensor either 2-wire or 3-wire, Process analog either 0 to 20mA or 0 to 10vDC. Line power from 20vAC up to 28vAC or 12vDC up to 40vDC. It has two control outputs: #1 is a switched dc and #2 is a 5A mechanical relay with normally open contacts.