Installation parameters:
Angle
45°
Sensor setback (B)
3 m (10 ft)
Sensor height (H)
4.6 m ( 15 ft)
Lane width
3 m (10 ft)
Calculated target dimensions:
Distance to target (D)
6.5 m (21.4 ft)
Target coverage area (A)
6 m
2
(66 ft
2
)
Major (long) diameter (L)
3.4 m (11.2 ft)
Minor (short) diameter (S)
2.3 m (7.7 ft)
The recommended installation angle of a Wintersense SDI-12 sensor is 30 to 60° (from vertical).
The following figure shows it at 45° from vertical.
Wintersense SDI-12 smart sensors contain a thermopile sensor which detects the presence of
thermal radiation emitted from the target surface. With non-contact infrared thermopile sensors,
the greater the installation angle of the sensor from vertical, the greater the risk of sensing
reflected radiation from other sources (such as long-wave infrared or reflected sunlight), which
can affect sensor accuracy. The Wintersense SDI-12 unit contains an integrated optical filter
(long-wave pass) that cuts off the visible and near-infrared radiant flux to provide optimum
ambient and sunlight immunity. The wavelength pass band of this optical filter is from 5.5 to 14
Wintersense SDI-12
15
