Metrohm Titrando - Specification of the Measuring Inputs; Specification of the Measuring Inputs (857 Only)

4.1 Technical data
36 Titrando Installation Instructions
Polarizer (857 only)
1 measuring input for polarized electrodes
Polarization current Ipol
1)
Polarization potential Upol
2)
–122.5 ... +122.5 µA in 2.5 µA steps
–1225 ... +1225 mV in 25 mV steps
1)
–125.0 / +125.0 µA: values not guaranteed, dependent on reference potential
+2.5 V
2)
–1250 / +1250 mV: values not guaranteed, dependent on reference potential
+2.5 V
4.1.3 Specification of the measuring inputs
Measuring range Resolution Measuring accuracy
1)
pH –20.000 ... +20.000 0.001 pH ± pH 0.003
Potential
2)
–2000 mV ... +2000 mV 0.1 mV ± 0.2 mV
Current
3)
–200 µA ... +200 µA 0.01 µA −
Temperature
Pt1000
NTC
–150 °C ... +250 °C
–20 °C ... +250 °C
4)
0.1 °C
0.1 °C
± 0.2 °C (Pt1000: –20 °C ...
+150 °C)
1)
± 1 digit, without sensor error, under reference conditions
2)
potentiometric and voltametric
3)
amperometric
4)
for a NTC-Sensor with R (25 °C) = 30'000 Ohm and B (25/50) = 4100 K.
Measuring cycle: 100 ms for all measuring ranges
4.1.4 Specification of the measuring inputs (857 only)
Measuring range Resolution Measuring accuracy
1)
pH –13.000 ... +20.000 0.001 pH ± pH 0.003
Potential
2)
–1200 mV ... +1200 mV 0.1 mV ± 0.2 mV
Current
3)
–120 µA ... +120 µA 0.01 µA −
Temperature
Pt1000
NTC
–150 °C ... +250 °C
–5 °C ... +250 °C
4)
0.1 °C
0.1 °C
± 0.2 °C (–20 °C... +150 °C)
± 0.6 °C (+10 °C... +40 °C)
1)
± 1 digit, without sensor error, under reference conditions
2)
potentiometric and voltametric
3)
amperometric
4)
for a NTC-Sensor with R (25 °C) = 30'000 Ohm and B (25/50) = 4100 K.
Measuring cycle: 100 ms for all measuring ranges