Campbell Scientific CR23X Micrologger - Manual (Page 227)

14-1
SECTION 14. INSTALLATION AND MAINTENANCE
14.1 PROTECTION FROM THE
ENVIRONMENT
The normal environmental variables of concern
are temperature and moisture. The standard
CR23X is designed to operate reliably from -25
to +50°C (-40°C to +80°C, optional) in
noncondensing humidity. When humidity
tolerances are exceeded, damage to IC chips,
microprocessor failure, and/or measurement
inaccuracies due to condensation on the
various PC board runners may result. Effective
humidity control is the responsibility of the user.
The CR23X is not hermetically sealed. Two half
unit packets of DESI PAK desiccant are located
by the batteries. This desiccant should, in most
cases, keep the interior components dry
between battery changes. A dry package
weighs approximately 19 grams and will absorb
a maximum of six grams of water at 40%
humidity and 11 grams at 80%. Desiccant
packets can be dried out by placing the packets
in an oven at 120°C for 16 hours (desiccant
only, not the CR23X).
Campbell Scientific offers two enclosures with
back plates for housing the CR23X datalogger
and associated peripherals. The back plates
have a grid of square holes punched on one
inch centers. The black CR23X datalogger
base has four holes at the corners used to
mount the datalogger. Small rubber mounting
feet are installed in the four holes when shipped
from the factory. The four rubber feet are
removed to access the four mounting holes.
The holes are on a 6 by 8 inch spacing. An
enclosure supply kit is shipped with the
enclosures. In the supply kit, are plastic
grommets and compatible screws. Place the
grommets in appropriate square holes then
attach the datalogger base to the enclosure
back plate with the supplied screws.
The fiberglass enclosures are classified as
NEMA 4X (water-tight, dust-tight, corrosion-
resistant, indoor and outdoor use). A 1.25"
diameter entry/exit port is located at the bottom
of the enclosure for routing cables and wires.
The enclosure door can be fastened with the
hasp for easy access, or with the two supplied
screws for more permanent applications. The
white plastic inserts at the corners of the
enclosure must be removed to insert the
screws. Both enclosures are white for reflecting
solar radiation, thus reducing the internal
enclosure temperature.
The Model ENC 12/14 fiberglass enclosure
houses the CR23X and one or more
peripherals. Inside dimensions of the ENC
12/14 are 14"x12"x5.5", outside dimensions are
18"x13.5"x8.13" (with brackets); weight is 11.16
lbs.
The Model ENC 16/18 fiberglass enclosure
houses the CR23X and several peripherals.
Inside dimensions of the ENC 16/18 are
18"x16"x8¾", outside dimensions are
18½"x18¾"x10½" (with brackets); weight is 18
lbs.