STA Safety Trip Alarm

The STA Safety Trip Alarm performs as a logic solver and reacts to potentially hazardous process conditions. It can warn of unwanted process conditions, activate emergency shutdown, and provide on/off control in safety instrumented systems (SIS) and traditional alarm-trip applications. The 4-wire STA accepts an input signal from transmitters (current and voltage inputs), temperature sensors (resistance temperature detector and thermocouple inputs), resistance devices and potentiometers, and a wide range of other monitoring and control equipment. It has three failsafe alarm outputs. Two are configurable process alarms that trip when a monitored process variable falls outside of user-set high and/or low limits. The third alarm is a non-programmable, latching alarm that is activated if any internal faults are found by the system’s extensive internal diagnostics, or if the input is faulty or broken.