This is the 4598th most frequent Dutch word.
ditect
It seems "ditect" is not a standard Dutch word. Could you mean "detect"?
In this sentence, 'detect' is a noun referring to the act or result of detecting something, specifically smoke.
De detect van rook activeerde de brandalarm.
The detection of smoke activated the fire alarm.
Here, 'detecteert' is the verb form. It describes the action of identifying harmful substances in the air by the device.
Dit apparaat detecteert schadelijke stoffen in de lucht.
This device detects harmful substances in the air.
In this instance, 'detect' emphasizes the conclusion drawn from observing suspicious activities.