Metrohm 719 S Titrino - Manual (Page 16)

2.4. Tutorial
719 S Titrino
12
2 × <QUIT>
Minimum titration rate inside the control range.
• Quit the inquiry with <QUIT>.
For the titration put a Exchange Unit with c(NaOH) = 0.1 mol/L on the Titrino and rinse
the tubing and the buret Tipp with <DOS>. Fill the buret again with <STOP/FILL>.
Plug a combined pH glass electrode into measuring input 1 (Ind I).
Pipette 2 mL c(HCl) = 0.1 mol/L into your titration vessel, dilute with ca. 20 mL dist. water.
Put a magnetic stirrer in the titration vessel and place buret tip and electrode in the probe,
see page 126 for their arrangement.
Start the stirrer and press <START>
During the titration the first line of the display shows the current measured value and the
volume already dispensed. The second line shows a "control bar", which indicates the
control deviation of the current measured value from the set end point.
After the titration the end point volume and its pH value is displayed.
With this end point a result can be calculated:
Calculation of the result: formula entry
<DEF>
<ENTER>
<1>
With this equivalence point a result can be calculated.
• Press the <DEF> key.
• Press <ENTER> to move on to the formula entry.
The display now shows "RS?".
• Press "1", i.e. the first formula.
You now can enter a formula. Note here the top inscrip-
tion on the keys of the keypad and the numbers. The
following symbols can be used:
EP# EP's with 1-digit number, e.g. EP1.
RS# Previously calculated results, e.g. RS1 in the sec-
ond formula.
C## Calculation constant with 2-digit number, e.g. C01.
C00 is reserved for the sample size. For the mean-
ing of the calculation constants see page 40.
def
>formula
RS?
RS1=
>SET1
min.rate 25.0µl/min
pH 2.67 0.351 ml
#======