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Maintenance and Troubleshooting
Maintaining UV and Solar Radiation Sensors
If the ISS is a Plus model and contains UV and solar radiation sensors, do not touch the
small white diffusers on top of the sensors. Oil from skin reduces their sensitivity. If you
are concerned that you have touched the diffusers at any time, clean the UV diffuser
using ethyl alcohol with a soft cloth. When cleaning the UV diffuser, DO NOT use rub-
bing or denatured alcohols because they can affect accuracy of the sensor readings. Ethyl
alcohol can be procured through an industrial or laboratory supply store. Clean the solar
diffuser with a soft damp cloth.
Due to the sensitivity of ultraviolet and solar radiation sensors it is common practice for
manufacturers to recommend re-calibration after a period of time. Users demanding high
accuracy typically recalibrate their sensors annually. Here at Davis Instruments, we have
seen less than 2% drift per year on the readings from these sensors.
Contact Technical Support about returning your sensor for calibration. See “Contacting
Davis Instruments” on page 27.
Cleaning the Radiation Shield
The outer plating of the radiation shield should be cleaned when there is excessive dirt
and build-up on the plating. Use a damp cloth to clean the outer edge of each ring.
Note: Spraying down or using water excessively to clean the radiation shield can damage the sensitive
sensors or alter the data and readings the ISS is transmitting.
Check the radiation shield for debris or insect
nests at least once a year and clean when
necessary. A buildup of material inside the
shield reduces its effectiveness and may cause
inaccurate temperature and humidity readings.
To thoroughly clean the radiation shield:
1. Remove the rain collector cone.
2. Using a Phillips head screwdriver, loosen
the three 4'' (~100mm) screws holding the
radiation shield plates together.
3. Taking care to maintain the order in which
the five plates are assembled, separate the
plates as shown and remove all debris from
inside the shield.
4" Screw
(3)
Plates
Rain Collector Base
Temp/Humidity
Sensor Plate
Lock
Washer
Flat
Washer
07395.249 Manual ISS Installation_RevE_Final_Print.pdf 27 4/7/2008 1:44:50 PM