Optex REDWALL-V Adjustment Procedures Manual page 11

Masking the Far Area Detection
There are 2 options when masking the Far Area detection.
a.) Use Detection range selector switch (except SIP-5030, SIP-100)
When use this switch, all Far area detection is cancelled.
b.) Use Masking plates to narrow detection area, from outside inward.
1. Masking plates are equipped
inside the main unit.
Fixing rubber
2. Take fixing rubbers off and
the plates can be moved.
3. Confirm which mirror should
be masked by area chart.
Be careful of mirroring effects.
If some object covers the zone
1 and 2, opposite side of mirror
needs to be masked (photo above).
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Far area zone