A process scanner is an instrument that has capability of connecting multiple sensors/ transmitters to it and display them on its LED or LCD display. The display shows each channel periodically in cyclic mode. Temperature Scanner is the most common example of Process scanner. Temperature scanners are capable of accepting inputs from various temperature sensors such as RTD Pt100, Pt1000, Pt50 etc or thermocouples such as J, K, R, S, T, B, E and N. Process scanners also provide alarm indication with Alarm and Trip output relay. Modern process scanners also provide communication ports such as RS232, RS485, Ethernet etc.