Hanna-instruments HI 9914 Bedienungsanleitung PDF herunterladen (Seite 9)

Water nozzle, Circulation and Feeding pump connection

The Water nozzle, Circulation pump and Feeding pump outputs are

relay type (2A, 240V). Both the NO (normally open) and NC (normally

closed) contacts are available to the user. If the device is off, the COM-

MON pin is connected to corresponding NC pin. If the device is on, the

COMMON pin is connected to the NO pin.

• Connect one pin of the source to the COMMON pin.

• Connect the device between the NO pin and the remaining source pin.

Alarm connection

The Alarm output is relay type (2A, 240V). Both the NO (normally open)

and NC (normally closed) contacts are available to the user. If the alarm

is off, the COMMON pin is connected to the NC pin. If the alarm is off, the

COMMON pin is connected to the NO pin.

• Connect one pin of the source to the COMMON pin of the alarm

output.

• Connect the alarm device between the NO output pin and the

remaining source pin.

Acid and fertilizer dosing pump connection

The pH and EC correction relays (2A, 240V)

have a common pin: if the pH correction

pump is on, the COMMON pin is connected

to the pH PUMP pin; if the EC pump is

activated, the COMMON pin is connected to

the FERT. PUMP pin.

• Connect one pin of the source to the COMMON pin.

• Connect the pH correction pump between the pH PUMP pin and the

remaining pin of the source.

• Connect the EC correction pump between the FERT PUMP pin and the

remaining pin of the source.

Note: Both pH and EC correction pumps must have the same operating

voltage. The rated power of the pumps can be different.

pin is the same, so that the voltage of the power source has to match the

working voltage of the selected device and both the pH and EC correction

pumps have to work at the same voltage.

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Hanna-instruments HI 9914 Bedienungsanleitung Seite 9