ELRO HA68S Multi-zone professional alarm system USERS MANUAL - Manual (Page 14)

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When considering and deciding upon the mounting position for the detector the
following points should be considered to ensure trouble free operation:
1. Do not locate the detector facing a window or where it is exposed to or facing
direct sunlight. PIR Detectors are not suitable for use in conservatories.
2. Do not locate the detector where it is exposed to ventilators.
3. Do not locate the detector directly above a heat source, (e.g. fire, radiator,
boiler, etc).
4. Where possible, mount the detector in the corner of the room so that the
logical path of an intruder would cut across the fan detection pattern. PIR
detectors respond more effectively to movement across the device than to
movement directly towards it.
Do not locate the detector in a position where it is subject to excessive
vibration.
5. Ensure that the position selected for the PIR detector is within effective range
of the system, (refer to System Installation and Operating Manual).
Note: When the system is armed, household pets should not be allowed into
an area protected by a PIR detector as their movement would trigger the PIR
and generate an alarm.