The SGB3 is required to protect against electrical surges (
(p. 9)). The CS225 is shipped
with the SGB3, a 2-ft cable for connecting the SGB3 to the data logger, and two pan Phillips
screws and two grommets for mounting the SGB3 to an enclosure backplate.
FIGURE 7-1. SGB3 3-line surge protector
7.3 Wiring
(p. 9) provides the connections for the SGB3 surge protector, CS225, and Campbell
Scientific data loggers.
Table
7-1:
Wire
colo
ur
,
function,
and
connections
to
the
SGB3
and
data
logger
CS225
wire
colo
ur
Function
SGB3 connection
terminal
Data logger connection
terminal
1
Red
Power
L1
12V
Green
SDI-12 Signal
L2
C or U
2
terminal
configured for SDI-12
Black
Power Ground
G
G
Clear
Shield
G
G
1
The SGB3 connects to the data logger using the 2 ft cable shipped with the CS225.
2
U terminals are automatically configured by the measurement instruction.
If multiple SDI-12 sensors are connected to a data logger, Campbell Scientific recommends using
separate terminals when possible. For the CR6 and CR1000X, triggering conflicts may occur when
a companion terminal is used for a triggering instruction such as
TimerInput()
,
PulseCount()
,
or
WaitDigTrig()
. For example, if the CS225 is connected to C3 on a CR1000X, C4 cannot be
used in the
TimerInput()
,
PulseCount()
, or
WaitDigTrig()
instructions.
CS225 Temperature String
9