Hanna-instruments HI 9910 Uživatelský manuál stáhnout pdf (Strana 24)

ACID

ALK

e.g. Dosing base liquids

Set point = pH 6.00

Measured value = pH 4.00

To adjust the sample stream to the setpoint, you need to

dose base, therefore select "ALK".

FOR HI 9911 (DUAL-POINT ADJUSTMENT)

a) ACID SETPOINT and DOSAGE

Turn the switches to "SET" and “ACID” (see 7 and 8 - Functional

Diagram) to

set the upper limitset the upper limit

set the upper limit and to direct the controller to

lower

the pH. The display will show the higher setpoint (e.g. pH

7.00).

Using a small screwdriver, adjust the “ACID SET” trimmers. First

adjust the “COARSE” trimmer and then fine tune with the “FINE”

trimmer (see 3 and 4 - Functional Diagram) until the desired set

value is displayed (e.g. pH 8.00).

a) ALKALINE SETPOINT and DOSAGE

Turn the switches to "SET" and “ALK” (see 7/8 - Functional Diagram)

set the lower limitset the lower limit

set the lower limit and to direct the controller to

increase

the

pH. The display will show the lower setpoint (e.g. pH 6.00).

7.00

SET

READ

ACID

ALK

COARSE FINE SLOPEOFFSET

ALKALINE SET

ACID SET

7.00

COARSE FINE SLOPEOFFSET

ALKALINE SET

ACID SET

8.00

SET

READ

ACID

ALK

6.00

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