The above zip file consists of following application notes
Current Loops
• 4-20 mA Current Loop Configurations
(Five common 4-20 mA Configurations)
• Understanding 4-20 mA Current Loops
• Designing 4-20 mA Current Loops
(Determining proper power supply voltage)
KKS Code Manual_Siemens -- Kraftwerk-Kenzeichen-System, popularly known as KKS, the standard 10 character code used to uniquely identify instruments in fossil-fuel fired power stations