Velleman HAA54 Manuel d'utilisateur télécharger pdf (Page 3)

HAA54 GB

3

4. “Double-Twin Optics”-system : detection of changing polarity

HEAT

DETECTOR 2

HEAT

DETECTOR 1

CH 1

CH 2

CH 1

CH 2

CH 1

CH 2

CH 1

CH 2

Radio interference in "normal" mode

Only one channel is activated Both channels are activated

HEAT

DETECTOR 1

HEAT

DETECTOR 2

Changing polarity of the signal

caused by the intruder

ALARM NO ALARM

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