In stal la tion of the HE400 bar ri ers
Re qui red area
. Mo del HE400 barrier must be lo ca-
ted in an area which is free of mo ving object such as
chain link fen ces, trees, bushes and lar ge area of wa -
ter (see Fig. 5). Large mo ving objects within the pro tec-
tion pat tern will be in di stin guis hab le from an in tru der
and will cause nuis sance alarms. The clear area re qui-
red for a mo del HE400 installation depends upon the
distance to be co vered by the link. In each installation
the cleared area must be at least as large as the pro -
tec tion pat tern.
Ter rain
. Since operation of the link re quires trasmis-
sion of energy from Trasmitter to Re ceiver, it is impor-
tant to main tain a clear line of sight betwe en the units.
Therefore, the ground must be flat across the protected
area. Any bumps, hills or ditches in the area will
shadow the beam and may pro vide crawl spa ce for
an intruder. Bumps or hills must be le
veled, and
dithches filled so that the area is flat to within 15 cm.
The pro tected area can be any stab le, reasonably
smooth ma terial such as concrete, asphalt, tilled earth,
or gra vel. If the re is grass or ve getation in the pro-
tected area, it must be kept cut to a ma ximum of 8 cm
in height. All the bushes or branches must be cut in or -
der to have a free area as large as the clear area.
Physi cal pro tec tion
. In stall the tras mitter and re -
ceiver in lo cations which pro vide protection from ac ci-
dental dam age as well as from tam pering. Simple de-
vices such as bumper posts or park ing guards may be
used to pro tect equipment from dam age from ve hicles
(see Fig ure 7).
Best se cu rity
. Choo se the lo cation that will pro vide
best se curity, yet be free from nui sance alarms. Al-
ways locate mo del HE400 in side a fence or inside a
controlled ac cess area to pre vent unwanted alarms
due to ran dom foot traffic, vehicles, or large animals.
Typically, units should be mounted between 0.75 and
1.0m above ground le vel and far enough in side fen ce
to provide a clear area of pro tection (see Figure 8).
For ma xi mum se cu rity it is ne ces sa ry to over lap the
ends of links so that the dead spot be low and imme-
diately in front of the adjoining link is pro tected. This
type of lo ca tion gi ves ma xi mum pos sib le se cu rity. A
11m over lap is re com mend ed at in ter me dia te points,
and a 5.5m overlap is re commended at corners. If site
de mands shor ter over lap, in crea sed sen si ti vity will re-
duce dead zone, but will also wi den beam. The offset
of overlapping links in line should be ap proximately
50cm; this di stance should be measured from cen ter
of each unit.
Connection of the de vice to the AC
sup ply
The ap paratus work with AC supply at a ma ximum vol-
tage of 19Vac. The connection between the receiver
or transmitter and the transformer should be the shor -
test possible (less than 4 m) with a wire not less than
1.5mm
2
. The wi res which con nect the tran sformer to
the 220 VDC must have a sec tion of 2.5mm
2
. In case
Model HE400 mi cro wa ve barrier
DT01142 - Page 4
DOCU MEN TAZI ONE TEC NICA
TECH NI CAL DOCU MEN TA TION
Fig. 5: At tention to trees!
YES
NO
Fig. 6: Installation on flat grounds only
YES
NO
Fig. 7: Avoid in terferences with mov ing objects
YES
NO
Fig. 8: Dis tance from the fence
YES
NO