Hanna Instruments HI 8050 User Manual

Page 42

− PPPPProgram Number

rogram Number

rogram Number - Panel index (used to view settings for all programs).

− PreIrrig

PreIrrig

PreIrrig - The selectable amount of pre-irrigation water in time or volume.

− PPPPPostIrrig

ostIrrig

ostIrrig - The selectable amount of post-irrigation water in time or volume.

PH CONTROL – S36

pHRef=07.3pH Prog 01

pHBnd: D=00.5 P=01.0

TimeOut:03min

PH CONTROL S36

Typically an acid is added to reduce the pH to a desired level. The Fertigation
Controller can control 1 acid tank. A desired pH set point or target reference
is programmed and the acid dosing is controller relative to the set point. The
program number indexes this panel. This panel displays and allows the setting
of the following parameters:
− pH Ref

pH Ref

pH Ref - The selectable pH set point programmed for pH control to main-

tain in the irrigation water.

− PPPPProgram Number

rogram Number

rogram Number - Panel index (used to view settings for all programs).

− Dead band

Dead band

Dead band -The selectable dead band around the pH reference. The

desired (target) pH range.

− PPPPProportional band

roportional band

roportional band -The selectable area around the setpoint where the

proportional control is active.

− TimeOut

TimeOut

TimeOut - Selectable pH control alarm time-out (represents the time inter-

val considered from the moment when the alarm condition actually ap-
pears and the moment when the alarm will be triggered). This parameter
allows the pH control to drive the motorized valves. It sould be greater
than the time needed for the motorised valves to close/open completely.

FERT CTRL MODE – S37

EC Ctrl: Y Prog:01

Ratiometric Ctrl:N

Vol Ctrl: N

FERT CTRL MODE S37

This panel is used to set the fertilization control mode between the three pos-
sible modes: EC control, Ratiometric control and Volume control. To select a
fertilizer control type you just have to press SET key then with the arrows keys
move the cursor to the desired type of control and pres Y key followed by
ENTER.
NO

NOTE

TE::::: The volume fertilizer control mode can be selected only if the irriga-

tion control mode is also in volume mode.

This manual is related to the following products:

HI 8060