Ytc, Valve Positioners, models:

TMP-3000	Product Manual
YT-1000L	Installation Manual User Manual Product Manual
YT-1000R	Troubleshooting Manual Instruction Manual
YT-1200L	User Manual
YT-2300 Series	User Manual
YT-2700 Series	User Manual
YT-2700L	Installation Manual
YT-3300 Series	Product Manual
YT-400	Installation Manual