ARITECH FIRE DT972 Intrinsically safe thermal sensor

Intrinsically safe thermal sensor.

The air in the double chambers is radiated to produce ions that travel to the positive and negative electrodes and then create a current flow in the chambers. Smoke entering the outer chamber causes a decrease in current flow and an increase in the voltage measured at the junction between the outer and inner chambers. The DI 950 does not work on the threshold. The analog voltage signal produced in the detection chamber is converted into a digital signal by the electronic circuit and transmitted to the control equipment during the interrogation. The control equipment then compares the signal with the stored data and initiates an early alarm or fire alarm as the smoke density increases. When the equipment determines that a fire condition exists, it tells the monitor to turn on the LED and the alarm routine starts.