This is the RTD relay mux board for the Low Energy PIU. This board contains the reed relays which can switch inputs from up to 16 RTD inputs to the LEPIU CCFA. The LEPIU can accept inputs from 100 ohm platinum RTDs.

The relays on this mux board have a finite lifetime. As the relays approach their lifetime limit of cycles, the mux boards become less reliable. WPC has put a lot of effort into improving the reliability of these mux boards. All boards currently sold have ALL NEW RELAYS on board, eliminating the primary failure mechanism that we have observed for these RTD mux boards.

This relay board is used with Honeywell’s 51301882-100 terminal board.