Choosing a Location for the Wireless Temperature Station Page 7
Consider these factors when locating the temperature probe to measure air
temperature:
✦
Place the probe where it will not be in direct sunlight and where it will have lim-
ited exposure to reflected sunlight.
If possible, place the sensor at least 5' (1.5 m) from any surface which is
exposed to direct sunlight.
✦
Limit the probe’s exposure to night sky.
The temperature probe will cool down faster than the surrounding air.
Inaccurate temperature readings from exposure to sunlight and night sky are
due to radiation effects. These effects can be minimized by placing your tem-
perature probe in a
Radiation Shield #7714
or
Fan-Aspirated Radiation
Shield #7750/7755
.
The following factors should be considered whether your temperature probe is
inside a radiation shield or not:
✦
If placing the probe on the outside of a building, a good location is under the
eaves on the north side of the building. (In the Southern Hemisphere, the south
side of a building is preferable.)
✦
Place the probe at least 10' (3 m) away from lights or lamps.
✦
Place the probe at least 5' (1.5 m) from chimneys and exhaust vents.
✦
Try not to run sensor cable across large metal objects such as aluminum siding.
Range of Wireless Transmission
The range of wireless transmission depends on many factors. For the best
reception, position the transmitter shelter and your console/receiver as close
together as possible.
Range is up to 800' (250 m) in the line of sight, under optimal conditions. Typi-
cal range under most conditions is 150' to 500' (45 to 150 m), but this may be
reduced by walls, ceilings, trees, or foliage. Radio-frequency interference (RF)
can also reduce transmission distance. Cordless phones and ham radios are
common examples of RF interference.
A metal roof or other large metal structure can interfere with the signal (alumi-
num siding, a furnace with metal ducts, and your refrigerator are examples).
Sometimes transmission between wireless units is obscured by something you
cannot identify, or by some obstacle that you can’t work around. If necessary,
consider using
Wireless Repeater #7624 or #7625
to strengthen the signal or
increase the distance between the transmitter and the console/receiver.
Wireless Temp Page 7 Thursday, December 7, 2000 2:09 PM
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