-
43
-
9.3.3
Virtual water meter for water sources
A virtual water meter associated with a
water source is supposed to measure
the water supplied by the source. The
ratio definition serves the same function
as explained above for virtual water
meters used for irrigation.
9.4
Analog Sensors
The
DREAM 2
is capable of reading analog sensors in various ways. Analog sensors,
located close to the controller can be hooked locally, and remote analog sensors can
be read by the 2 wired RTU units and by the RF RTU units. The total number of
analog sensors recognized by the system must be defined during the
SYSTEM
CONFIGURATION
. However the type of each analog sensor and the range of its
scale are defined in the following screen:
First select the sensor type and then
define the minimal value at 4mA and
the maximal value at 20mA columns.
Next the output type of the sensor
must be defined. Sensors whose
signal is 4-20 mA will be categorized
by “Current” and those whose signal
is 0-5v will be categorized by
“Voltage”.
The analog sensors can be used for conditioning the system’s operation and can be
logged for analyzing the system’s behavior.
Some analog sensors will be defined automatically while a special interface is
declared. Interface pH/EC generates automatically 2 analog sensors, interface of a
weather station generates 11 analog sensors and the THD interface generates 3
analog sensors. Details can be found in the Installation manual, in which the
configuration procedure is explained.
