Xylem WL400 WATER LEVEL SENSOR - Manual (Page 4)

Global Water
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• globalw.com
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III. Sensor Installation
General
a. Water Level sensors have many applications and therefore many
installation options. All the sensors are fully submersible and may be
suspended by their waterproof cables in the water to be monitored.
b. Do not install the water Level sensor in applications that contain
solvents. Over time, many solvents can deteriorate the cable and the
sensing element.
c. Install the water Level sensor so that it is easily accessible for
calibration purposes. Take care not to kink the cable. This will close
the vent tube that the sensor uses to compensate for barometric
changes. Also be aware that the sensor may need to removed and
reinstalled in the future, so plan ahead!
d. The sensor will not function correctly if mud, silt, leaves, or other
debris buries it. Install the sensor in a way that will avoid these
conditions.
e. All Global Water water level sensors produce a 4-20 mA output signal.
4-20 mA is an industrial standard signal for process control monitoring.
Most PLCs (Programmable Logic Controller), RTUs (Remote
Telemetry Unit), and data acquisition systems accept this signal
directly.
f. The power wire (red wire) must be connected to positive supply
terminal of the data logger or of the battery. The 4-20mA signal wire
(black wire) is connected to the data logger’s input terminal. If the
sensor is equipped with the optional temperature output circuit,
connect the output wire (white wire) to a second input terminal on the
logger in the same way as the level output.