Xylem XL Series H-522 - Plus - Manual (Page 25)

XL™ Series
Hardware Options and Installation 2-11
Figure 2-10 4 to 20mA Output Section
2.2.11 4 to 20 Milliamp Output
Pins 12 and 13 of the terminal block provide connection points for the 4 to 20 milliamp output
signal.
Several instrumentation applications use sensors that provide an industry standard 4 to 20
milliamp output signal. The XL™ Series data logger / DCP can output a 4 to 20 milliamp signal
based on any of its inputs. For example, a user may want to connect a temperature probe to the
XL™ and convert the temperature value into a 4 to 20 milliamp output. A temperature probe on
Analog Channel 1 that produces a 0 to 5 volt output representing 0 to 100 degrees Celsius could
easily be setup to produce a 4 to 20 milliamp output that represents the 0 to 100 degrees. The
XL™ does not actually output a 4 to 20 milliamp signal, but rather controls the current in a loop
that is powered externally. Figure 2-11 shows a basic connection diagram.
Figure 2-11 Basic 4-20 mA Wiring Configuration