Operating instructions

12 METTLER TOLEDO DL36
Key selection Display/Entry (example)
Titration
t(stir) [s]? 0 .............10
Enter
t(wait) [s]? 15
Enter
t(max) [s]? 0
Enter
Drift stop: rel ↑
Select
Drift stop: abs ↑
Select
Drift stop: off ↑
Select
Drift stop: rel ↑
Enter
rel [µg//min] 6 ...............4
Enter
The method
7.2 Printing out a method
You can always print out the parameters of a group:
• When you have selected Titration and press the Print key, the corresponding parameters
are printed out.
• When you have selected Result and press the Print key, the calculation and report para-
meters are printed out. These parameters are printed out separately when you press the
Print key while a parameter of the corresponding menu is displayed.
7.3 Modifying a method
You can change the parameters of the groups before and during the pretitration or standby
titration.
7.3.1 Titration parameters
The parameters are responsible for the control of the titration. You define stirring and titration
times as well as drift values which lead to abort of the titration.
Description
Stirring time after the start of the titration: used to
ensure thorough mixing or complete release of mois-
ture from the sample; during this time, no iodine is
generated, in other words no H
2
O is titrated.
Wait time: the titration can not be aborted during this
time. A value <15 is not possible!
t(max) is an abort parameter, the titration is aborted
after "t(max) + t(wait)" even if the end point has not
been reached (t(max) = 0: abort parameter not de-
fined, see next page).
The drift stop is the second abort parameter.
rel: relative drift stop; the titration is aborted when
the drift is less than the "measured drift (before
the titration) + the defined value" of, e.g.
4 µg/min.
abs: absolute drift stop; the titration is aborted when
the drift is less than the entered drift value, e.g.
6 µg/min.
off: abort parameter not defined.
Notice: You must define either t(max) > 0 or a drift
stop value, otherwise you receive an error message
during the titration. If you define both parameters, the
titration will be aborted as soon as one of the values is
reached.
Enter, e.g. 4 for the relative drift stop.
"<Run>", "Ready" or "Stable" is displayed.