Metrohm 916 Ti-Touch - Manual (Page 358)

28.7 Electrode test for pH electrodes (ELT)
￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
342 ￭￭￭￭￭￭￭￭
916 Ti-Touch
￭ "+": counterclockwise rotation
￭ "–": clockwise rotation
Input range –15 - 15
Default value 8
28.7.5 Further information
Table 10 Limit values of the three electrode types
Rating
Excellent electrode Good electrode Usable electrode
Electrode type "Standard"
Streaming potential 2.5 mV 3.0 mV 4.0 mV
Drift 2.0 mV/s 2.5 mV/s 3.0 mV/s
Min. slope 96.5 % 96.0 % 95.0 %
Max. slope 101.0 % 102.0 % 103.0 %
Response time 45 s 50 s 60 s
Lower limit Uoff –15 mV
Upper limit Uoff 15 mV
Electrode type "Gel"
Streaming potential 3.0 mV 3.5 mV 4.5 mV
Drift 2.5 mV/s 3.0 mV/s 4.0 mV/s
Min. slope 96.5 % 96.0 % 95.0 %
Max. slope 101.0 % 102.0 % 103.0 %
Response time 60 s 75 s 90 s
Lower limit Uoff –20 mV
Upper limit Uoff 20 mV
Electrode type "Non-aqueous"
Streaming potential 3.0 mV 4.5 mV 6.0 mV
Drift 5.0 mV/s 7.0 mV/s 9.0 mV/s
Min. slope 88.0 % 80.0 % 70.0 %
Max. slope 120.0 % 130.0 % 140.0 %
Response time 60 s 75 s 90 s
Lower limit Uoff –50 mV
Upper limit Uoff 100 mV