Cs240-To-Data-Logger Wiring - Campbell CS240 Product Manual

FIGURE 7-1. 2-Wire Circuit Diagram
FIGURE 7-2. 4-Wire Circuit Diagram

7.1.1 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.
10) and Table 7-2 (p. 10). 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.
CS240 and CS240DM PT-1000 Class A, Back-of-Module Temperature Sensors 9