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5.4.4. Two Analog Sensor Option
With the Plus option activated, this option allows up to two analog sen-
sors to be connected in order to measure different quantities (pressure, solar
radiation, soil moisture content, temperature, etc.). This is used by the
Agrónic PC program to record the sensors, or in the Plus Option to condition
irrigation programs.
It allows the sensors to make measurements, generating electrical cur-
rent from 0/4 to 20 mA or voltages between 0 and 20 Volts. The wiring in
this option has one switch per sensor to select the measurement using cur-
rents or voltages. The default is set to current; “I” position; to select voltage, it
must be set to the “V” position. The wiring is housed behind the keypad. The
location of the switch at each input it is necessary to set in
“Parameters
-
Installer”
[6.8.].
The external connector located on the right side of the box-mount mod-
el, or on the bottom or the built-in model, has four terminals to connect up
the sensors.
Terminal 1: Output wire from sensor A1.
Terminal 2: Output wire from sensor A2.
Terminal 3: corresponds to the output wire for the sensor power supply, 12 V, 200 mA.
Terminal 4: common for the sensor inputs and common for the power supply output (0 V).
Example:
Sensor with independent power supply: Connect the common from the sensor to terminal 4 and the
sensor signal to terminal 1 or 2.
Sensor powered by the Agrónic: Connect the common from the sensor to terminal 4, the sensor signal
to terminal 1 or 2 and the power supply positive to terminal 3.
Sensor with only positive and return: Connect the positive to terminal 3 and the return to terminal 1 or 2.
5.4.5. Battery Charger Option
The Agrónic 2500 has a battery charger, optional in the “relay output” models and the “latch” model series.
12 V lead-acid batteries must be used that have a capacity between 3 and 7 Ah.
In the “latch” models the capacity of the solar panel can run between 2 and 10 W to 7 or 12 V. This is used
mainly at facilities without an electrical supply that use latch electrovalves, and can connect up to a solar panel
and charge the battery.
In the “relay output” models never it be connected a solar panel, in these models it will connect a 12 V ±5
% power supply (90-230 V / 12 V). This is used mainly at facilities with an electrical supply which need to send a
warning SMS when the power is out (implies the Plus and Communications options).
Technical features:
Maximum charging capacity:
160 mA (2 W)
Minimum solar input voltage:
7 V
Maximum solar input voltage:
18 V (“latch”) / 12V (“relay”)
Examples of the connections: