Power Connection; Power-Up Sequence; Earth Ground Connection; Mounting In An Enclosure - Campbell TEMP 120 Product Manual

9.7 Power connection

Connect the power supply to the removable Power connector on the side of the TEMP 120.
Power supplies providing voltages from 9.6 to 32 VDC may be used.
While the input power requirements of Campbell Scientific instruments vary, there is one
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constant – they all run on 12 VDC. To keep things simple, we only discuss the use of 12 VDC
power supplies in this manual.
Do not connect energized wires to an instrument. All connections discussed assume de-
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energized wires. Switch off power supplies before making connections.
Double check the polarity of connections before switching on power supplies.
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9.7.1 Power-up sequence

Best practice is to start all instruments in a station simultaneously from a single power supply. If
this is not possible, first turn on TEMP 120s, then the data logger. This procedure will reduce the
time required to synchronize the CPI bus.
See Status LED (p. 25) for more information.

9.8 Earth ground connection

Earth grounding provides protection from static discharge, transients, and power surges. A
ground lug is provided on the TEMP 120 for connection to earth ground, see
overview (p. 9). Minimum 14 AWG ground wire is recommended. The earth side of the
connection should be to a grounding rod or other grounded device.

9.9 Mounting in an enclosure

Campbell Scientific data loggers and GRANITE Measurement Module brackets have mounting
holes through which small screws are inserted into nylon anchors in an enclosure backplate.
Wiring panel
TEMP 120 19