7. Maintenance
7.1 When to replace desiccant
The humidity indicator card or optional CS210 Enclosure Humidity Sensor indicates when the
desiccant needs to be replaced.
CAUTION:
Because desiccant is inexpensive, Campbell Scientific recommends replacing desiccant
packets rather than attempting to reactivate the desiccant.
7.1.1 Humidity indicator card
The humidity indicator card has three colored circles that indicate the percentage of humidity.
Desiccant packets inside the enclosure should be replaced with fresh packets when the upper dot
on the indicator begins to turn pink. The indicator card does not need to be replaced unless the
colored circles overrun.
7.1.2 Optional CS210 humidity sensor
The CS210 Enclosure Humidity Sensor contains an Elan HM2000 series precision bulkpolymer
relative humidity sensor to measure relative humidity inside an enclosure. When the
measurements exceed 35% relative humidity, replace the desiccant packets. Refer to the CS210
manual for sensor specifications, installation procedures, and programming information.
7.2 Resistance to weathering
Enclosures are coated to protect them from UV rays and other weathering. However, the outer
surface of enclosures exposed to extreme weather (rain, wind, and/or UV rays) may erode so that
glass fibers become apparent. The depth of the erosion is superficial and only affects the
aesthetic appeal; it does not reduce the effectiveness in protecting equipment.
Customers who are worried about weathering can periodically rub the enclosure exterior with
petroleum jelly or a carnauba-based car wax. The appearance of an enclosure that has already
been eroded can be sprayed with clear acrylic paint or coated with primer and white paint.
Follow the procedure provided in either
(p. 25) or
25) to ensure proper bonding.
Enclosures
24
