This part is a kind of semiconductor called MP1423.

Function of this product has (MP1400 - MP1423) RTD Input Limit Alarm.

Manufacturers : M-System

Image and pinout :

Some of the text within the PDF file :

INSTRUCTION MANUAL RTD INPUT LIMIT ALARM Thank you for choosing M-System. Before use, check specifications on the unit label. If you have any problems or questions with the product, please contact M-System’s Sales Office or representatives. model MP1400 through MP1423 Adjustments •Setpoint The MP1400 Series has five styles of setpoint adjustment: MP14X0 Top-accessed, 3-turn screw(s) MP14X2 Remote dial connection(s), 1k to 100k ohms MP14X3 DC-programmable, 0 to 1V The setpoint is adjustable over the entire input span. A) Set deadband at its minimum (fully counterclockwise) before adjusting the setpoint. B) With the specified trip Resistance/RTD input applied, adjust setpoint until the relay trips. For Hi trip calibration, start with the setpoint above the desired trip. For Lo trip cal [ ... ]

MP1423 PDF Datasheet Download