Hanna Instruments HI 9914 - Manual (Page 7)

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Conductivity probe connection
• Attach the conductivity probe (HI7632/D or HI3003/D) to the DIN
socket located on the bottom of the controller. Align the guide on the
connector with the socket, push-in the connector and tighten the
retainer ring.
• The probe is provided with a built-in temperature sensor, which allows
automatic temperature compensation of the readings.
Level inputs connections
All level sensors must have a contact type output.
If the water level is above the sensor position, the corresponding contact
is closed. If the water is below the sensor, the contact is open.
Each sensor will be connected between the INPUT COMMON (pin 9) and
the corresponding input pin ( LOW LEVEL, NORM LEVEL, HIGH/ALARM
LEVEL).
• If the matching pin is used, connect
the matching pin terminal to the con-
nector pin 2 located on the right panel.
• Immerse the matching pin near the pH electrode.
Minimal tank assembly: only the normal level sensor is used, the irriga-
tion 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 ground-
ing 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.