Hanna Instruments HI 9914 User Manual
Instruction Manual
HI 9914
Wall mounted
Fertigation
Controller
Manufacturers since 1978
1
These Instruments are in
Compliance with the CE
Directives
Dear Customer,
Thank you for choosing a Hanna Product. Please read this instruction
manual carefully before using the instrument.
This manual will provide you with the necessary information for a correct
use of the instrument, as well as a precise idea of its versatility.
If you need more technical information, do not hesitate to e-mail us at
tech@hannainst.com.
These instruments are in compliance with CE directives.
TABLE OF CONTENTS
PRELIMINARY EXAMINATION ......................................................... 3
GENERAL DESCRIPTION ................................................................. 3
MECHANICAL LAYOUT ................................................................... 5
FUNCTIONAL DESCRIPTION ........................................................... 6
SPECIFICATIONS........................................................................... 8
INSTALLATION ...........................................................................10
TANK ASSEMBLY SETUP .............................................................. 10
CONNECTIONS AND WIRING........................................................ 12
CONTROLLER START-UP .............................................................. 18
NORMAL OPERATION .................................................................19
ALARM CONDITIONS .................................................................. 22
CONTROLLER SETTINGS............................................................... 23
CALIBRATION ............................................................................. 26
pH ELECTRODE CONDITIONING & MAINTENANCE ........................... 29
CONDUCTIVITY PROBE MAINTENANCE ........................................... 31
ACCESSORIES ............................................................................. 32
APPENDIX .................................................................................. 33
A-pH VALUES AT VARIOUS TEMPERATURES ............................. 33
B-NUTRIENT SOLUTION - TABLES ........................................... 34
C-INSTALLATION EXAMPLES.................................................... 36
WARRANTY ................................................................................ 38
CE DECLARATION OF CONFORMITY ............................................... 39
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PRELIMINARY EXAMINATION
Remove the instrument from the packing material and examine it carefully to make sure that no damage has occurred during shipping. If there
is any noticeable damage, notify your Dealer.
Note: Save all packing materials until you are sure that the instrument
functions correctly. Any defective item must be returned in the
original packaging, together with the supplied accessories.
• Read carefully the instructions before using the instrument.
• Never install the controller outdoors, in a wet or humid area or under
direct sun light. Nor install the controller where liquids may be
sprayed or poured on it.
• The instrument has to be connected to a mains socket.
• The instrument’s mains power line is protected by a 400mA fuse. Use
only a 400mA fuse for replacement.
• The instrument’s dosage, water nozzle, feeding pump, circulation
pump and alarm terminals are protected by separate 2A fuses. Use
only 2A fuses for replacement.
GENERAL DESCRIPTION
HI 9914 Wall Mounted Fertigation Controller is designed to meet specific
process control requirements in agricultural, horticultural and hydroponics applications.
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 feature for a best
easy reading.
The EC probe is designed with a built-in temperature sensor which allows
the controller to automatically compensate for the temperature effect.
The matching pin prevents potential grounding problems and thus
ensure longer life to the pH electrode.
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 order to increase the conduc-
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tivity 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.
The controller is designed with relay outputs for pH and Conductivity
control (2A/240V), each one corresponding to a status LED for visual
check.
Three level sensors are used to offer the best control of water level, alarm
conditions and irrigation sequences.
The beginning of the irrigation can be triggered through an external
signal, while an additional input allows to restart the cycle at any time.
The good water composition is signaled on the front panel and with an
external signal for remote operating purposes.
The controller is equipped with an alarm system activated when an
unusual working condition occurs.
A humidity detector can be used to stop the controller if any leakage is
detected.
Water nozzle, Circulation pump, Feeding pump and Alarm are equipped
with 2A (240V) relays.
Two models of HI9914 controller are available, according to the required
power supply: 220/240V or 110/115V, at 50/60Hz.
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MECHANICAL LAYOUT
Front view
The molded mounting holes in the 4 corners provide for quick and secure
installation. No additional tool is needed. All the electrical connections
and control are located on the front panels so that adjustments can be
made without removing the unit.
Bottom view
The modular design isolates the control circuitry from the contacts, making possible to wire the connections and then close the compartment.
Adjustments can be made through the “control area” (left panel),
without open the connection compartment (right panel).
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FUNCTIONAL DESCRIPTION
LEFT PANEL
1. LCD for Conductivity readings
2. EC SET button
3. EC slope adjustment trimmer
4. EC MEAsure button
5. Alarm LED
6. Reset button
7. LCD for pH readings
8. pH slope adjustment trimmer
9. pH offset adjustment trimmer
10. Acid / Base selector switch
11. pH MEAsure button
12. pH SET button
13. FILL button
14. Feed OK LED
15. EC setpoint knob
16. EC pump LED
17. pH pump LED
18. Water nozzle LED
19. Feed pump LED
20. pH setpoint knob
21. Circulation pump LED
22. RUN/STOP switch for Circulation pump
23. Timer knob
24. Timer mode selection switch
25. BNC connector for pH electrode
26. DIN connector for EC probe
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RIGHT PANEL
1. Connections for matching pin
2. EC analog output
3. pH analog output
4. Level sensors input
5. Mains power fuse
6. Fuse for pH and EC correction dosing pumps
7. Fuse for Water nozzle relay
8. Fuse for Feeding pump
9. Fuse for Circulation pump
10. Fuse for Alarm relay
11. Feed OK output
12. Connections for external fill switch
13. Irrigation start
14. Mains power transformer
15. Humidity sensor input
16. Power input
17. pH and EC pumps output
18. Water nozzle output
19. Feeding pump output
20. Circulation pump output
21. Alarm output
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Bottom view
1. DIN connector for EC probe
2. BNC connector for pH electrode
3. Wiring access ports
SPECIFICATIONS
Conductivity
Range 0.00 to 10.00 mS/cm
Resolution 0.01 mS/cm
Accuracy (@20ºC/68ºF) ±5% Full Scale
Typical EMC deviation ±2% Full Scale
Setpoint Adjustable, from 0.50 to 10.00 mS/cm
Temp.Compensation Automatic from 0 to 50°C
Calibration Manual, through slope (80-120%) trimmer
on the front panel
Analog output 0-5V ±5% (0.5V / mS)
Controller output 2A, 220V relay
pH
Range 0.00 to 14.00 pH
Resolution 0.01 pH
Accuracy (@20ºC/68ºF) ±0.02 pH
Typical EMC deviation ±0.1 pH
Setpoint Adjustable, from 0.5 to 14.0 pH
Calibration Manual through offset (±2 pH) and slope
(80 to 120%) trimmers on the front panel
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Analog output 0-7V ±5% (0.5V / pH)
Controller Output 2A, 220V relay
other features
Timer Adjustable, from 1 to 10 min within a
15-minutes-time frame
Feed OK output 12V, 15 mA current source
Humidity sensor Active when resistivity is below 220 KΩ
Water nozzle output 2A, 220V relay
Circulation pump output 2A, 220V relay
Feeding pump output 2A, 220V relay
Alarm output 2A, 220V relay
Water level inputs Contact type water level sensors
User input Contact type switch
External FILL button Contact type push-button
Power supply 220/240V or 110/115V; 50/60Hz
Environment -10 to 50°C (14 to 122°F);
RH 95% max. non-condensing
Dimensions 189 x 228 x 102 mm (7.4 x 9 x 4”)
Weight 1.75 Kg (3.85 lb.)
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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 complexity 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.
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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.
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Minimal tank assembly: only the normal level sensor is used, the irrigation is made manually, regardless of the water composition or level. The
controller will refill the tank if the water goes under normal level for about
15 minutes or if the fill button is pressed.
Note: The inlet of the circulation pump must be below its outlet to avoid
damages to the pump itself.
CONNECTIONS AND WIRING
Wiring the controller
• Make sure the power supply is disconnected.
• Make sure all the auxiliary power sources are off.
• Unscrew the 4 screws from the right hand panel and remove the lid
and the gasket.
• Thread the wires through the access port on the right hand side of the
controller.
• Before connecting the controller to the mains, wire it completely,
connect the pumps, valves, alarm, probes, level sensors and user
input.
• Replace the lid. Connect the controller to mains line.
• Turn on all the auxiliary sources.
pH electrode and ground probe connections
• Attach the in-line pH electrode (for example HI 1001) to the BNC
socket on the bottom of the controller.
• Use the matching pin (differential input) to prevent potential grounding problems and thus ensure longer life to the electrode.
• If the matching pin is not used, short pin 1 and pin
2 of the external connector located in the right panel.
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