Metrohm 790 Personal IC - Manual (Page 180)

6.1 Technical data
790 Personal IC
171
6 Appendix
6.1 Technical data
6.1.1 Conductivity measurement
Measurement range 0…1000 µS/cm (resolution: 0.56 nS/cm)
Maximum error ± 10 µS/cm and
± 1 % of measurement value (k = 16.7/cm)
Linearity Deviations < ± 5 µS/cm
Noise typ. 3 nS/cm
Drift (electronic) typ. < 10 nS/cm / h
Temperature dependence typ. < 40 nS/cm / °C
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).
Cell volume 1.5 µL
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 operating
temperature
Operating temperature 40 °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)
6.1.3 Injection valve
Actuator switching duration 100…150 ms
Pressure resistance 25 MPa (250 bar)