User Manual

ManualsBrandsHanna Instruments ManualsSensorsHI 8050

alarm is triggered. For more information on the propotional band please

consult the proportional control section.

Given a conductivity alarm condition, conductivity control can be main-

tained if “Ctrl on EC alarm” is selected using panel number

S54S54

S54 (ALARM

BEHAVIOR).

Statistical values of total conductivity are displayed on panel

C20C20

C20 (TOTAL

AVERAGES). For the average conductivity of each irrigation program see

panel

C21C21

C21 (PROGRAM AVERAGES) and for average conductivity of each

individual sector see panel

C22C22

C22 (SECTOR AVERAGES).

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RARA

TIOMETRIC CONTROLTIOMETRIC CONTROL

TIOMETRIC CONTROL

In this mode the user has to specify for each program the quantity of each

fertilizer to be dosed. The quantity can be specified in volume or in weight

of active substance. All these settings are made in panel

S41 S41

S41 (RATIOMETRIC

CTRL). If the volume is set Y, the proportion is dosed for each fertilizer as

volume of fertilizer solution in volume of irrigation water. If the volume is

set to N, the weight of active substance is specified together with the con-

centration of fertilizer solution. The controller will dose then the volume of

fertilizer that contains the specified active substance.

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VOLUME CONTROLVOLUME CONTROL

VOLUME CONTROL

This mode is available only if the program works with irrigation in volume.

The settings are made in panel

S42S42

S42 (FERT VOL CTRL). Here is specified

the volume of fertilizer solution and the volume of irrigation water in which

is to be mixed.

PH CONTROLPH CONTROL

PH CONTROL

pH control is necessary to correct and maintain the pH of irrigation water

within specified range: pH reference minus or plus dead band value.

The pH control also has a dead band and a proportional band. These

values are set using panel

S36S36

S36 (pH CONTROL).

The value of pH sensor and the reference value are displayed on panel

C05C05

C05 (pH STATE).

pH sensor value is displayed also on panel

C03C03

C03 (SENSORS STATE) and in

C01C01

C01 (GENERAL INFO).

pH control will generate a pH alarm if for a period of time (more than the

time specified using panel

S36S36

S36 (PH CONTROL)) the pH is not within the

specified range. Given a pH alarm condition, pH control can be main-

tained if “Ctrl on PH alarm” is selected using panel number

S54S54

S54 (ALARM

BEHAVIOR). Also given a pH alarm condition, irrigation can be main-

tained if “Irrig on PH alarm” is selected using panel number

S54S54

S54 (ALARM

BEHAVIOR).