C-9317 Emergency Gas Override Control is used to control the start and stop of gas extinguishing system. It's usually installed in areas to be protected. When fire occurs, pressing emergency start button, messages can be sent to gas extinguishing control panel, which will give gas extinguishing command and start the solenoid after delay. During the delay time, if the person in field can confirm there is no fire, he could press the emergency stop button. Operation Principle: Since the connected extinguishing control panel is able to check broken circuit and short circuit, the four states of short circuit, broken circuit, normal and alarm are distinguished by the loop resistance, which is 3k? in normal state, and 330? and 3k? in parallel when the button is pressed. Start output is by pulse mode and stop output is by electric level mode.