Metrohm 900 - Limit Values for the Electrode Rating

15.7 Custom electrode type
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900 Touch Control
Upper limit Uoff
Upper limit value for the offset voltage, i.e. the voltage at pH = 7.0. The
value applies for all ratings.
Input range –999 to 999 mV
Default value 15 mV
15.7.1 Limit values for the electrode rating
You can define limit values for the three electrode ratings Excellent elec-
trode, Good electrode and Usable electrode. These values represent
maximum values that may not be exceeded (exception: Min. slope =
minimum value).
Streaming potential
The streaming potential is the difference between the measured voltages
in stirred and unstirred solution.
for very good electrodes:
Input range –999.9 to 999.9 mV
Default value 2.5 mV
for good electrodes:
Input range –999.9 to 999.9 mV
Default value 3.0 mV
for usable electrodes:
Input range
–999.9 to 999.9 mV
Default value 4.0 mV
Drift
The drift in stirred solution is determined for each buffer. The sum of these
values is compared with this value here.
for very good electrodes:
Input range 0.1 to 9.9 mV/min
Default value 2.0 mV/min
for good electrodes:
Input range 0.1 to 9.9 mV/min
Default value 2.5 mV/min
for usable electrodes:
Input range
0.1 to 9.9 mV/min
Default value 3.0 mV/min