Metrohm 751 GPD Titrino - Manual (Page 29)

2.6. Parameters, key <PARAM>
751 GPD Titrino
26
min.rate 25.0 ul/min
**titr.
stop crit: drift
**titr.
stop drift 20 ul/min
**titr.
t(delay) 10 s
**titr.
stop time OFF s
**titr.
Minimum dosing rate (0.01...999.9 uL/min)
This parameter determines the addition rate right at the
start and the end of the titration, see also page 31.
This parameter influences the titration speed and
therefore its accuracy very strongly: A smaller min.rate
results in a slower titration.
Type of stop criteria (drift, time)
Titration stops if EP is and stop drift is reached. (1...999
uL/min)
Titration stops if there is no dosing during t(delay).
(0...999 s, INF)
<CLEAR> sets "INF"
Switch off when the end point is reached and the set
time after the last dispensing has elapsed.
If "INF" is set, an inquiry regarding the stop time
appears.
If t(delay) is "INF"
Stop after a time (0...999 999 s, OFF)
<CLEAR> sets "OFF".
Stop after the set time after the start of the titration.
"OFF" means no stop, i.e. titration for an "infinitely" long
time.
>titration parameters
titr.direction: auto
pause 1 0 s
**titr.
start V: OFF
cond.
start V 0.0 ml
cond.
factor 0
cond.
General titration parameters
Direction is set automatically (+, -, auto)
auto: The direction is set automatically by the Titrino
(sign [U
first
- EP]).
+: Direction of higher pH, higher voltage (more
"positive"), larger currents.
- : Direction of lower pH, lower voltage, smaller
currents.
The titration direction is fixed if two EP's are set. In this
case, an input for titration direction has no meaning.
Pause 1 (0...999 999 s)
Waiting time before start volume, e.g. for equilibration
of the electrode after the start. The waiting time can be
aborted with <QUIT>.
Type of start volume (OFF, abs., rel.)
"OFF": start volume switched off
"abs.": absolute start volume in mL
"rel.": relative start volume to sample size.
If "abs." is set:
Absolute start volume (0...999.99 mL)
If "rel." is set:
Factor for relative start volume (0...±999 999).
Calculated as: start V in mL = factor * sample size