Campbell 237, Руководство по эксплуатации продукта

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237 Leaf Wetness Sensor
5
receives minimal direct sunlight at mid-day during the growing season.
Gillespie and Kidd favo u r a 60 degree tilt on a north facing sensor such
that water runs away from the cable connection to minimize puddling on
the electrodes. FIGURE 7-1 shows a simple-to-construct mounting
bracket.
FIGURE 7-1. Example 237 Field Installation
7.3 Wiring to Datalogger
FIGURE 7-2 is a circuit schematic of the 237. TABLE 7-1 describes wiring to
Campbell Scientific dataloggers.
FIGURE 7-2. 237 Sensor Schematic
TABLE 7-1. Wire Colo u r, Function, and Datalogger Connection
Wire
Colo u r Wire Function Datalogger Connection Terminal
Black
Voltage-
excitation input
U configured for voltage excitation 1 ,
VX or EX (voltage excitation input)
Red
Analog ue
voltage output
U configured for single-ended analog ue
input 1 , SE (single-ended, analog ue -voltage
input)
Purple
Bridge resistor
lead
⏚ (analog ue ground)
Clear EMF shield
⏚ (analog ue ground)
1 U channels are automatically configured by the measurement instruction.
⏚