The 141AA-00001AB Unheated Absolute Pressure Switch features 1 Torr full scale pressure measurement and a 0.5 inch OD tube fitting. It includes double pole Form C relay contacts that are energized when pressure is below the set point for Fail-safe operation. Designed for applications where a DC signal output is not required, the 141A provides relay outputs that are readily interfaced with alarms, valve actuators, computers, process controllers, or other protection devices. Based on the well-known MKS Baratron® capacitance manometer principle of operation, the 141A senses the deflection of a diaphragm due to applied pressure, providing a switched relay output. An LED provides visual ''above set point'' indication, and facilitates adjustment of the set point. The dual electrode sensor is an all-metal, all-welded design, thus exposing only corrosion-resistant Inconel to the process gases.