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Metrohm 726 Titroprocessor User Manual

Page 60

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4.2 Dosing devices

726 Titroprocessor, Instructions for use

54

54

Buret units

In order that the Prepare (PREP) and Empty (EMPTY only for 700 Dosino)

functions can be optimally used the correct type of buret unit should be

selected for each dosing device.

³ Concentr. 0.01 mol/L
³ Tubing Default

ß Buret unit type

³ Buret type 10.0mL

(with selection list)

The definition of buret units with their corresponding tubing parameters can

be carried out during configuration, see page 46ff.

4.2.2 Dosing device functions

In order to operate a Dosimat or Dosino manually place the field cursor in

the column of the required dosing device and press the corresponding

softkey.

Softkeys

[Fill

all]

causes all connected dosing devices to fill their burets.

[Fill]

triggers buret filling for the selected dosing device.

[Prepare

buret]

triggers a preparation cycle (PREP) for the selected
dosing device. The tubing and cylinder of the buret unit

are rinsed in accordance with the tubing parameters of

the type of buret unit (see page 46ff).

[Dosing

drive]

opens the dialog window for manual dosing with the
selected dosing device, see below.

[Empty]

triggers emptying (EMPTY) the buret of the selected
dosing device. The tubing and cylinder of the buret unit

are emptied in accordance with the tubing parameters of

the type of buret unit (see page 46ff). This is only possible

with 700 Dosinos.

[STOP]

stops the current process for the selected dosing device.

[STOP

all]

stops all connected dosing devices.

In order to achieve the highest possible accuracy and to ensure that there

are no air bubbles in the tubing the ‘Prepare’ function should be carried out

before the start of a series of determinations. This function should be used

as often as is necessary, but at least once per day.
The ‘Empty’ function is useful if the reagent in a buret unit is to be

exchanged. The tubing and the buret cylinder are emptied so that the

reagent can be exchanged without great loss of reagent.
The ‘Prepare’ and ‘Empty’ functions are automated filling and dosing

processes which take the volumes of the buret unit cylinder tubing into

account. This is why it is necessary to enter the dimensions of the tubing as