Metrohm 873 Biodiesel Rancimat Manual - Manual (Page 174)

7.3 Conductivity measurement ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
166 ￭￭￭￭￭￭￭￭ 873 Biodiesel Rancimat
Shutdown temper-
ature 260 ± 11 °C
(if this temperature is exceeded, the heating is shut down, and switched
on again at 210 ± 11 °C)
Heating up time
for the instrument approx. 45 min (from 20 °C to 120 °C)
approx. 60 min (from 20 °C to 220 °C)
Instrument exter-
nal temperature < 50 °C
(at operating temperature 220 °C)
7.3 Conductivity measurement
Sensor Conductivity measuring cell, integrated in the measuring vessel cover
6.0913.130
Structure Conductivity measuring cell with 2 steel electrodes
Measuring princi-
ple AC current measurement with 1 kHz frequency and approx. 1.7 V ampli-
tude (peak to peak)
Cell constant 1.00…1.20
(the exact value can be entered manually or determined automatically)
Measuring range 0…400 µS/cm
Resolution 0.1 µS/cm
Maximum error ±1 % ± 0.5 µS/cm
7.4 Gas flow regulation
Pump Membrane pump
Adjustable range 7…25 L/h
Max. deviation
from the set range ±10 %