Campbell Scientific CS700 Tipping Bucket Rain Gage and CS700H Heated Rain Gage - Manual (Page 13)

CS700 and CS700H Rain Gage
4.1 CS700 Connections
The CS700 is typically wired to a datalogger’s pulse channel (see Table 4-1).
TABLE 4-1. CS700 Wiring for Pulse Channel Input
Color
Description CR800,
CR850
CR1000
CR3000
CR5000
CR510
CR500
CR10(X)
21X
CR7
CR23X
CR200(X)
Series
Black Signal Pulse Channel Pulse Channel Pulse Channel P_SW
White Signal Return G
Clear Shield G
Dataloggers listed in Table 4-2 have the capability of counting
switch closures on some of their control ports. When a control
port is used, the return from the rain gage switch must be
connected to +5 volts on the datalogger. NOTE
TABLE 4-2. CS700 Wiring for Control Port Input
Color
Description CR800
CR850
CR1000
CR3000
CR500
CR510
CR10X
CR23X
Black Signal Control Port
(e.g., C1-C8)
C2/P3 Control Port
(e.g., C1-C8)
Control Port
(e.g., C1-C8)
White Signal Return 5 V 5 V 5 V 5 V
Clear Shield G
The CR10 does not support the use of control port inputs with the Pulse Count
instruction.
Black
White
Clear
100 Ω
FIGURE 4-1. Rain Gage Schematic
Long cables have appreciable capacitance between the lines. A built up charge
could cause arcing when the switch closes, shortening switch life. A 100 ohm
resistor is connected in series at the switch to prevent arcing by limiting the
current (Figure 4-1). This resistor is installed on all rain gages currently sold
by Campbell Scientific.
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