HANNA instruments HI 9914 Industrial Grade pH and Conductivity Fertigation Controller User Manual
- June 3, 2024
- HANNA instruments
Table of Contents
HANNA instruments HI 9914 Industrial Grade pH and Conductivity
Fertigation Controller
Wall Mounted
Two measuring channels, one for pH and one for conductivity
Two Measuring Channels
The controller is provided with two measuring channels, one for pH and one for conductivity. The actual values of pH and conductivity are displayed separately on two large LCDs with backlight features for the best easy reading.
Three Level Inputs
Three-level inputs are used to offer the best control of water level, alarm
conditions, and irrigation sequences. At the beginning of the irrigation can
be triggered through an external signal, while an additional input allows
restarting the cycle at any time. The good water composition is signaled on
the front panel and with an external signal for remote operating purposes.
(Note: Sensors are not included and must be purchased separately).
Matching Pin
Avoid typical problems caused by grounding loop currents, such as progressive
damage of the electrode, fluctuating measurements, and poor process
regulation. The matching pin prevents potential grOunding problems and thus
ensures a longer life for the pH electrode,.
Alarm System
The controller is equipped with an alarm system activated when an unusual
working condition occurs. When an alarm condition is reached, the LED turns
ON, and the alarm
the relay contact is closed.
Two Regulators
The controller includes two regulators for pH and conductivity, each of them
can be adjusted from the front panel and the setpoint values will be
displayed. The conductivity regulator adds fertilizer in orden to increase the
conductivity of the irrigation water, while the pH regulator can be set for
high or low pH correction. For a better result, the conductivity and pH
controls are time separated and a timed operation mode avoids Overdosing of
fertilizer or acid.
Specifications HI9914
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