3 junction boxes – Campbell Scientific CR9000X Measurement and Control System User Manual
Page 64
Section 1. Installation
Strip
0.5”
FIGURE 1.1-1. CR9000X input terminals
FIGURE 1.1-2. Bulkhead connectors installed in CR9000X cover
1.1.3 Junction Boxes
Individual sensor leads (and multiconductor cables) may be routed directly
from the sensor locations to the CR9000X or routed to a junction box and then
to the CR9000X. When sensors are spread out over a large area, a junction
box provides a convenient method for changing sensors in one location
quickly. Junction boxes can also provide more localized protection against
instrumentation damage as a result of lightning induced high voltages.
Junction boxes should be sealed adequately to limit air exchange and stocked
with fresh desiccant (Section 1.3). When used for thermocouple lead wires
junction boxes need to be insulated to reduce thermal gradients (Section 3.4).
1-2
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