Metrohm 855 User Manual

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7 Technical specifications
855 Robotic Titrosampler
￭￭￭￭￭￭￭￭
55
7 Technical specifications
7.1 Measuring interface
The 855 Robotic Titrosampler has one galvanically isolated measuring
interface.
The measuring cycle is 100 ms for all measuring modes.
7.1.1 Potentiometry
One high-ohm measuring input (Ind.) for pH, redox or ISE electrodes and
one reference measuring input (Ref.) for a separate reference electrode.
Input resistance
> 1 · 10
12
Ω
Offset current < 1 · 10
–12
A (under reference conditions)
Measuring mode
Measuring
range
–20 - +20 pH
Resolution 0.001 pH
0.1 mV
Measuring accu-
racy
±0.003 pH
±0.2 mV
(±1 digit, without sensor error, under reference conditions)
7.1.2 Polarizer
A measuring input (Pol.) for a polarizable electrode.
Measuring mode
Ipol
Determination with adjustable polarization current
Polarization cur-
rent
–125.0…+125.0 µA (in steps of 2.5 µA)
–125 - –121 µA / +121 - +125 µA: non-guaranteed values, dependent
on reference voltage +2.5 V
Measuring
range
–1200 - +1200 mV
Resolution 0.1 mV
Measuring
accuracy
±0.2 mV
(±1 digit, without sensor error, under reference conditions)
Measuring mode
Upol
Determination with adjustable polarization voltage
Polarization
voltage
–1250 - +1250 mV (in steps of 25 mV)

Metrohm 855 Specifications

General

Brand	Metrohm
Model	855
Category	Laboratory Equipment
Language	English