Specifications

1-1
Section 1. Installation and Maintenance
1.1 Protection from the Environment
The normal environmental variables of concern are temperature and moisture.
The standard CR3000 is designed to operate reliably from -25°C to +50°C (-
40°C to +85°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 PC board may result.
Effective humidity control is the responsibility of the user.
The CR3000 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 CR3000).
Extra desiccant should also be placed in the enclosure to prevent corrosion on
the Wiring Panel terminals and CR3000/Wiring Panel connections.
Campbell Scientific offers environmental enclosures for housing a CR3000
and associated peripherals. The enclosure back plates have a grid of square
holes punched on one inch centers. The black CR3000 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 (watertight, 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. The
enclosures are white for reflecting solar radiation, thus reducing the internal
enclosure temperature.
The Model ENC 12/14 fiberglass enclosure houses the CR3000 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 CR3000 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.