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Question:

Which type of leak detector works by drawing the vapor into the system and heating it?

A Electronic leak detector
Explaination

Electronic leak detector works on the principle that when halogen vapor is heated, it increases the positive ion concentration thereby increasing the conductivity of the air sample drawn between the ion emitter and collector (anode and cathode). This increase in positive ion conductivity is magnified using electrical circuit so that audio or visual signal is produced.