29
Test procedure for masking detection
(Anti-masking):
The required action:
At a distance of about 50 cm from
detector's front, hold a white paper while
its surface is facing the detector's front.
Move the paper slowly and horizontally
toward detector's front.
Compulsory reaction of the detector:
At a distance of 5 cm from detector's front,
the detector should detect that its near
field-of-view was blocked.
When blocking is detected, the Green
LED indicator will blink. If the blocking
situation remains consistent for about 30
seconds, the Green LED indicator will
remain on and the Anti-masking Relay will
change its contact state.
That state will be maintained as long as
the paper bl
ocks the detector’s near field-
of-view at a distance of about 5 cm.
Even after removing the blocking paper,
that state will be maintained for about 10
seconds. Then the Green LED indicator
will turn OFF and the Anti-masking Relay
contacts will return to their normal state.
