Campbell CS240, Руководство по эксплуатации продукта

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FIGURE 7-4. 4-Wire Circuit Diagram
7.3.1 CS240-to-data-logger wiring
The data loggers can measure the CS240 by using a 2-wire or 4-wire configuration ( Table 7-1 (p.
12) and Table 7-2 (p. 13)). The 2-wire configuration accuracy decreases, relative to the 4-wire, as a
function of the cable length. The 4-wire configuration eliminates resistance due to cable length
and is the most accurate way to measure this sensor. The CS240 is shipped ready for the 2-wire
configuration. The wires used only for the 4-wire configuration are taped to the side of the cable.
Table 7-1: Wire color, function, and data logger connection for the CS240 2-wire configuration
Wire color Wire function Data logger connection terminals
Black
Voltage excitation
input
U configured for voltage excitation
1
,
EX, VX (voltage excitation)
White Analog voltage output
U configured for single-ended analog input
1
,
SE (single-ended, analog input)
Red Reference ⏚ (analog ground)
1
U terminals are automatically configured by the measurement instruction.
CS240 and CS240DM PT-1000 Class A, Back-of-Module Temperature Sensors 12