Metrohm 916 Ti-Touch - Manual (Page 446)

32.2 Measuring inputs
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916 Ti-Touch
32.2 Measuring inputs
The measuring cycle is 100 ms for all measuring modes.
32.2.1 Potentiometry
A high-ohm measuring input (Ind.) for pH, metal or ion-selective elec-
trodes and a measuring input for separate reference electrodes (Ref.).
Input resistance > 1 · 10 12 Ω (under reference conditions)
Offset current < 1 · 10 –12 A (under reference conditions)
Measuring mode
pH
Measuring
range –13 - +20 pH
Resolution 0.001 pH
Measuring
accuracy ±0.003 pH
(±1 digit, without sensor error, under reference conditions)
Measuring mode
U
Measuring
range –1,200 - +1,200 mV
Resolution 0.1 mV
Measuring
accuracy ±0.2 mV
(±1 digit, without sensor error, under reference conditions)
32.2.2 Polarizer
A measuring input (Pol.) for polarizable electrodes.
Measuring mode
Ipol Determination with adjustable polarization current.
Polarization
current –120 - +120 µA (increment: 1 µA)
–125 - –121 µA / +121 - +125 µA: non-guaranteed values, dependent
on reference voltage +2.5 V
Measuring
range –1,200 - +1,200 mV
Resolution 0.1 mV
Measuring
accuracy ±0.2 mV
(±1 digit, without sensor error, under reference conditions)