11
10
Typical arrangements for the Tank assembly
Complete tank assembly: all the sensors and pumps are mounted; the
best control of water composition and irrigation sequence is assured. The
inlet and outlet of the circulation pump are below the Low Level to avoid
that the pH electrode remains dry.
Simplified tank assembly: the low level detector is not used; the controller
does not react if the water level is too low.
Note:
If a feed pump is used, provide a little water volume to keep
always the level in the tank above the circulation pump inlet.
Note:
The inlet of the circulation pump must be below its outlet to avoid
damages to the pump itself.
INSTALLATION
Install the
HI 9914
controller on a wall, indoors, in a dry area and not
under direct sun light. Assure that liquids can not be sprayed or poured
on it. Fix the controller at a proper height to easily reach the front panels
and fix the 4 screws at the 4 corners.
Install the controller near the tank to keep short the cables of pH
electrode and Conductivity probe.
Assure the proper working voltage.
TANK ASSEMBLY SETUP
HI 9914
can work with different tank volumes and with various complex-
ity of tank assembly. For proper operation of the controller, the tank
assemblies must be set minding the following:
- the pH electrode and EC probe should rapidly detect any modifications
in the water characteristics;
- it is recommended to use a circulation pump to mix water with fertilizer
and acid;
- fertilizer and acid should be added to the water at distance from sensors
to assure good mixing before the measuring point is reached;
- make sure that the pH electrode is always wet;
- the level sensors must be in the correct order, bottom to top: low level,
normal level and high (alarm) level;
- place the sensors in the area with the minimum waves amplitude;
- when a level is reached, the corresponding level sensor will close the
contact;
- the humidity detector must be placed outside the tank, where water
leakage can be detected;
- the inlets for the circulation and the feeding pumps must be under the
minimum water level (low level sensor);
- the normal level sensor must be used in all tank arrangements;
- if the high (alarm) level sensor is not used, leave the pin unconnected;
- if the low-level sensor is not used, connect the corresponding pin to the
common;
- if the humidity sensor is not used, leave the pin unconnected;
- for activate external refill, press the corresponding push-button.
