Metrohm 890 Titrando - Manual (Page 42)

8.1 Measuring interface
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890 Titrando
8 Technical specifications
8.1 Measuring interface
The 890 Titrando has one measuring input for polarizable electrodes.
The measuring cycle is 100 ms for all measuring modes.
8.1.1 Temperature
A measuring input (Temp.) for temperature sensors of the Pt1000 or NTC
type with automatic temperature compensation.
R (25 °C) and B value can be configured for NTC sensors.
Measuring range
Pt1000 –150 - +250 °C
NTC –5 - +250 °C
(R (25 °C) = 30,000
Ω and B (25/50) = 4,100 K)
Resolution
Pt1000 0.1 °C
NTC 0.1 °C
Measuring accu-
racy
Pt1000 ±0.2 °C
(Applies for measuring range –20 - +150 °C; ±1 digit; without sensor
error, under reference conditions)
NTC ±0.6 °C
(Applies for measuring range +10 - +40 °C; ±1 digit; without sensor
error, under reference conditions)
8.1.2 Polarizer
One measuring input (Pol.) for polarizable electrodes.
Measuring mode
Ipol Determination with adjustable polarization current
Polarization
current –122.5 - +122.5 µA (increment: 0.5 µA)
–125.0 - +125.0 µA: non-guaranteed values, dependent on reference
voltage +2.5 V
Measuring
range –1,200 - +1,200 mV
Resolution 0.1 mV