Metrohm 761 Compact IC - Manual (Page 199)

6.1 Technical data
761 Compact IC
189
6 Appendix
6.1 Technical data
6.1.1 Conductivity measurement
Measurement range 1 0 … 1000 µ S/cm (resolution: 0.56 nS/cm)
Measurement range 2 0 … 250 µ S/cm (resolution: 0.14 nS/cm)
Measurement range 3 0 … 50 µ S/cm (resolution: 0.028 nS/cm)
Maximum error ± 1 % of full scale value and
± 1 % of measurement value (k = 16.7/cm)
Linearity Deviations < ± 0.5 % of full scale value
Noise
Measurement range 1
Measurement range 2
Measurement range 3
typ. 10 nS/cm
typ. 2.5 nS/cm
typ. 0.5 nS/cm
Drift (electronic) typ. < 10 ppm/h of full scale value
Temperature dependence typ. < 40 ppm/°C of full scale value
Reserve range > 33 % (k = 16.7/cm)
Sampling rate 10 measurements/s (fixed)
6.1.2 Conductivity detector
Construction Thermostatted conductivity detector with
2 ring-shaped steel electrodes
Measurement principle Alternating current measurement with 1 kHz
frequency and ca. 1.7 V amplitude (peak to
peak).
Effective cell volume 0.8 µ L
Cell constant approx. 17 /cm (the exact value is printed on the
detector)
Maximum back pressure
for measuring cell
5.0 MPa (50 bar)
Thermostatting Connectable dynamic control to adjustable
operating temperature
Operating temperature Adjustable in steps of 5°C from 25 … 45°C
Max. temperature deviation ± 2.5°C
Heating time ≥ 30 min
Temperature stability ≤ 0.01°C at constant ambient temperature
Connection for detector block Dsub 15 pin (female)