Hanna-instruments HI 9910 Manual de usuario descargar pdf (Pagina 26)

PROPORTIONAL CONTROLPROPORTIONAL CONTROL

PROPORTIONAL CONTROL

In order to optimize the controlling process and reduce the amount of

chemicals used, it is recommended to use a proportional dosage

appropriate for the system.

All models allow for a proportional band (0 to 2.0 pH or 0 to 200 mV

delta) as well as a time cycle (from 0 to 90 seconds) to be set. The

proportional dosage is obtained by personalizing a current pulse

whose height equals the pH or ORP proportional delta and the

length corresponds to the selected time cycle.

The controller will enter

proportional dosageproportional dosage

proportional dosage at

setpoint plussetpoint plus

setpoint plus

or minus the preselectedor minus the preselected

or minus the preselected delta. It will then keep the dosing

relay activated for a period proportional to the difference between the

measurement and the setpoint over the cycle.

OXID

RED

SECONDS

090

2.0

0.5

1.5

PROPORTIONAL SETTINGS

DOSING DIRECTION

Select the direction of dosing through the "OXID"/”RED” switch (see 8

- Functional Diagram). For reducing dosage (i.e. lowering the mV

value) leave the selector on "RED". Likewise, for oxidizing solutions (to

increase the mV) select the “OXID” position.

e.g. Dosing reducing substances

Setpoint = mV 650

Measured value = mV 700

switch to the "RED" position (see 8 - Functional Diagram).

e.g. Dosing oxidizing substances

Setpoint = mV 650

Measured value = mV 500

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

dose oxidants, therefore select "OXID".

OXID

RED

1 2 ... 21 22 23 24 25 26 27 28 29 30 31 ... 39 40

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Hanna-instruments HI 9910 Manual de usuario Pagina 26

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