Metrohm 726 Titroprocessor - Manual (Page 179)

8. Command reference 8. Command reference
726 Titroprocessor, Instructions for use 173 173
Equilibr.time
Max. delay period before measurement acceptance
0.1…9999 s | auto | off
The whole delay period for measurement acceptance
becomes effective when, with switched-on drift control
(see measurement drift above), the preset value for the
drift is not undercut. Otherwise the measurement will be
accepted when the measurement drift is reached.
The whole delay period will also be allowed to elapse if
the drift control is switched off.
The equilibrium time can be switched off. In this case
only the measurement drift is decisive for the measure-
ment acceptance.
With the setting 'Equilibr.time auto' the Titro-
processor will use an equilibrium time which is suitable
for the preset measurement drift value. It is calculated
according to the following equation:
Equilibr time in s
drift mV
. ( )
/ ( / min) .
=
+
+
150
0 01
5
For the standard setting 50 mV this results in an equilib-
rium time of 26 s.
For multiple measurements the equilibrium time must
be shorter than the measuring interval as otherwise the
timing pattern for the measuring intervals cannot be fol-
lowed if the measurement drift is too large.
Temperature
Temperature setting or measuring mode
-170…25.0…500°C | auto | initial
The temperature can be automatically determined dur-
ing a titration with the aid of a Pt100/Pt1000 sensor or a
combined electrode with built-in temperature sensor
and can be used for automatic pH correction (if pH is
being measured).
It is possible to record the temperature throughout a ti-
tration and to output it as a temperature curve.
numerical manual input (e.g. for pH correction)
auto automatic measurement during the
whole titration (for temperature curve)
initial one-off measurement at the start of
the titration mode
The temperature can be included in formulas for calcu-
lations (see page 118ff), e.g. for volume corrections.
The different system variables are listed on page 171
and 128.
Please note: start temperature ST and closing tem-
perature CT are only available with auto.