Hanna-instruments HI 9914 Uživatelský manuál stáhnout pdf (Strana 8)

External fill button connection

• Connect the button

between FILL and IN-

PUT COMMON pins.

• The tank will be im-

mediately filled with

water if the external

fill button is pressed

and the water level is

below the normal level

float.

External FEED OK connection

This output is a current source from the FEED OK pin.

• Connect a LED, buzzer or other

device between FEED OK and IN-

PUT COMMON pins.

• When the water composition is good

for irrigation, the FEED OK will

source about 15mA and activate

the device.

Analog output connections

• Connect an external device between the

EC+ and EC- (for Conductivity signal) or

pH+ and pH- (for pH signal) pins.

• The output voltage is related to the value displayed on LCD. For EC the

output will be 0V for 0.00 on LCD and 5V for 10.00 on LCD; for pH the

output will be 0V for 0.00 on LCD and 7V for 14.00 on LCD.

Note: Never connect “EC” with “pH”. Make sure there is no galvanic

connection between the EC and the pH analog outputs, otherwise

the measured values will be not reliable and probes can be

damaged.

Relay connections

The controller is provided with six relay outputs (2A, 220V) protected by

2A fuses.

When a relay is off the COMMON pin is connected with the NC pin; when

is on the COMMON pin is connected with the NO pin.

The NC pin is not accessible for the pH and EC pumps and the COMMON

• Place the low-level sensor to indicate the minimum water level for the

correct function of both the circulation and feeding pumps.

• Connect the sensor between INPUT COMMON and LOW LEVEL pins.

• Place the normal-level sensor to indicate the filling level when the tank

is full.

• Connect the sensor between INPUT COMMON and NORMAL LEVEL pins.

• Place the alarm-level sensor to limit the highest water level.

• Connect the sensor between INPUT COMMON and HIGH (ALARM) LEVEL

pins.

Note: The level sensors act correctly if the sensor switch is closed when the

water is above the corresponding level

Irrigation start connection

Connect the irrigation-start switch

between INPUT COMMON and IR-

RIGATION START pins.

Irrigation can be controlled by:

• using a switch connected between the INPUT COMMON and IRRIGA-

TION START: the irrigation is started by closing the switch, and lasts

until the contact is open.

• using a 5V-logic signal, connected to the IRRIGATION START and

referred to INPUT COMMON: the irrigation starts at level “0” (0V)

and stops at level “1” (5V).

• using a level sensor that will be open when the desired level is

reached: the controller will irrigate until the desired level is reached,

and the irrigation will restart if the water falls below this level.

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