Appendix A: Optional Temperature
Sensor
The optional temperature sensor is
mounted separately and requires a location
away from the influence of chimneys, air
conditioners, vents, tar roofs, concrete, and
parking lots that can cause abnormal
temperature fluctuations. Usually, a
separation of at least 20 to 30 feet
horizontally and eight feet vertically is
required to achieve this. Locations where
air movement is restricted are also
unsatisfactory.
The recommended location for the
temperature sensor is a north eave or
northern exposure away from direct
sunlight and above grass. This location
gives extra stability and accuracy to the
sensor because of the added shading,
usually obtained on a northern exposure.
There should be at least one foot between
the bottom of the eave and the top of the
temperature sensor housing for accurate
readings, as seen in
Figure 34
on the right.
Due to the nature of the signal cable used
to send the temperature information, the
maximum distance between the
temperature sensor and the display is 1,000
feet (304.8 meters).
Figure 34:
Temperature Sensor Eave/Wall Mount
Figure 35:
Temperature Sensor Mounting to Bottom of Display
Another recommended location for a
temperature sensor is on the display
itself, or somewhere on the display
structure. A light-colored display is
preferred in this application. Location of
the sensor should be above, below, or on
a northern edge to try to keep the sensor
shaded. If mounting above the display, a
minimum height of six feet is required. If
mounting below the display, a minimum
of eight feet above ground and a
minimum of one foot between the sensor
and display are required, as seen
Figure
35
on the right. Greater accuracy is
obtained if there is grass below the
display, rather than concrete or some
other material.
Refer to
Figure 35
above
for wiring instructions.
Appendix A: Optional Temperature Sensor
A-1
