QTech Data Systems People Counter System - Manual (Page 5)

2. INSTALLATION GUIDE
When used for counting foot traffic, mounting the Q54 Data Logger, is best, either above
the entrance way or in a place where the entry and exit is narrow and restricts the traffic
through the catchment area of the PIR.
The enclosure should be mounted on a flat surface in a vertical position, this seats the
enclosure so that the natural angle of enclosure, where the PIR is positioned, angles
upwards (see diagram). The enclosure has six fixing holes through the base plate. Should
it be more appropriate to mount the enclosure from the ceiling then there is an overhead
fixing plate available (see later picture).
The PIR has a purposely refined narrow band of operation when mounted at 2100 mm
above the floor (typical standard door height) the area of operation for the PIR sensor is
approximately 1200mm wide by 400mm deep.
As described above the PIR sensor is mounted so that it is angled so when it is mounted
flat against the wall the sensors operational area is below and in front of the unit as
shown in the figure below.
PIR Operation Footprint Base Plate Layout