Metrohm 900 Touch Control Manual - Manual (Page 421)

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29 Parameters
900 Touch Control
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Test criterion Message Remedy
The streaming potential is too high. Contaminated diaphragm Clean the diaphragm (see leaflet for
the electrode).
Two slopes do not fulfill the limit val-
ues for the rating Usable electrode. Wrong buffer Repeat the electrode test with buf-
fers pH 4, 7 and 9.
All the slopes do not fulfill the limit
values for the rating Usable elec-
trode. Partial short circuit ￭ Check the temperature sensor.
￭ Enter the correct calibration tem-
perature.
29.12 Evaluations (EVAL)
Various additional evaluations (EVAL commands) can be carried out for
titrations and measurements. The evaluation always refers to the last titra-
tion or measurement prior to the EVAL command. Only those evaluation
commands which are available for the last titration or measurement prior
to the EVAL command can be inserted in the list of commands. If a titra-
tion or measuring command is deleted before the EVAL command, then it
will be shown in red in the list of commands, as the reference is missing.
EVAL commands can also be inserted in the method run at a later time
and the determination can be reevaluated ([Recalculate] function in the
results dialog).
Additional evaluations for DET titrations
The following additional evaluations are possible:
￭ EVAL FIX-EP (fixed endpoints)
Measured quantities:
– Measured value
– Time
– Volume
￭ EVAL pK/HNP (pK value / half neutralization potential HNP)
This evaluation is only possible for the measuring modes pH and U.
￭ EVAL MIN/MAX (minimum/maximum)
￭ EVAL BREAK (break points)
Additional evaluations for MET titrations
The following additional evaluations are possible:
￭ EVAL FIX-EP (fixed endpoints)
Measured quantities:
– Measured value
– Time
– Volume
￭ EVAL pK/HNP (pK value / half neutralization potential HNP)
This evaluation is only possible for the measuring modes pH and U.
￭ EVAL MIN/MAX (minimum/maximum)