Campbell Scientific TORO® NW8002 Weather Station Installation - Manual (Page 24)

SECTION 2. MAINTENANCE
2-3
FIGURE 2.3-3 4831 Temperature/Relative
Humidity Probe Assembly
The temperature sensor (thermistor) requires
no maintenance. If the screen is removed for
inspecting or cleaning the relative humidity chip,
BE CAREFUL OF THE THERMISTOR WIRE
LEADS, THEY ARE VERY DELICATE!
In a clean air environment, the relative humidity
sensor should perform for up to one year. AS A
RULE, THE RH CHIP SHOULD BE
REPLACED EVERY YEAR. The life span
however, is dependent upon air quality. In
extreme environmental conditions, the RH chip
may need to be replaced every six months or
so.
Cleaning of sensor should be performed every
two months, and more often in extreme
environmental conditions, if necessary. An
environment is considered extreme if
penetrants, insecticides, fertilizers, and other
chemicals are used on a regular basis.
Sensors are extremely sensitive to
contamination by sulfur gases and smoke. Do
not smoke while cleaning the sensor.
To clean the sensor loosen the two retaining
screws and remove the screen. (Figure 2.6-1)
Take the screen off and thoroughly clean the
screen. DO NOT TOUCH THE RELATIVE
HUMIDITY CHIP! Remember that while the
sensor is rugged, the function of it is to sense
water vapor in the air; therefore, careful
handling is very important. A gentle clean (oil
free) air blast, or a gentle brush with clean, soft,
camel's hair is best for cleaning.
1) If the chip has a film of dirt, oil, or other
contamination on it, replace the chip.
2) If the clip socket to which the chip is
fastened to is rusty, replace the sensor.
Contact your Toro distributor for sensor or chip
replacement.
Temperature/Relative Humidity
2.4 MAINTENANCE LOG BOOK
The following log notes allow you to keep
records on your system. It also can be very
informative to the distributor should the system
fail.
WEEKLY
Rain Gage (Inspect and clean if necessary)
Date OK/Comments
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