Campbell Scientific CR9000X Measurement and Control System - Manual (Page 63)

Section 1. Installation
1.1 Enclosure
The CR9000X is equipped with either the –L option laboratory case or the –F
option fiberglass case. There is also the CR9000XC, which is a compact
version that will only hold five I/O modules. The laboratory case can be used
in a clean, dry, indoor environment or mounted in an enclosure. The fiberglass
case provides a self-contained field enclosure. Campbell Scientific does not
punch holes in the fiberglass case because it is our experience that most users
like to customize the wire entry locations for their applications.
During the manufacturing of the fiberglass case, the base and lid are formed
together to ensure a perfectly matched fit. A six-digit serial number is stamped
into the extruded aluminum rims on both the base and lid. When more than
one CR9000X is owned, care should be taken to avoid a mismatch which could
prevent a gas-tight seal. (Note that there is a pressure release valve on the
enclosure. If you have difficulty removing the lid, try pressing the release
valve to equalize the pressure differential between the case and atmosphere.)
1.1.1 Connecting Sensors
The CR9000X input modules use screw terminals for connecting sensor wires
(Figure 1.1-1). Terminals for individual wires provide the most flexibility for
connection to the wide range of sensors the CR9000X is used to measure as
well as allowing the simplest field repair of the wire termination (strip and
twist or tin).
1.1.2 Quick Connectors
Some customers who use CR9000Xs for numerous tests requiring the same or
similar sets of sensors have found it useful to pre-wire the CR9000X to a set of
plug-in quick connectors that mate with those installed on their sensors. Most
of the CR9000X's modules have quick connect options (EC option when
ordering, i.e. CR9051EC)) for this type of applications. Customers can either
use these or build their own bulkhead type connectors that can be installed
either in the aluminum wiring panel cover or in the fiberglass case (Figure
1.1-2).
1-1