User Manual

Multi 3500i Operation

Note

The ConOx double sensor can perform the salinity correction automat-

ically. The conductivity module of the sensor measures the salt content

of the test sample simultaneously with the DO. The measuring instru-

ment takes the measured value into account.

AutoRead

(drift control)

The AutoRead function (drift control) continually checks the stability of

the measurement signal. The stability has a considerable impact on the

reproducibility of measured values. The display of the measured vari-

able flashes until a stable measured value is available.

Criteria With identical measurement conditions, the following applies:

4.6.3 Settings for DO sensors

Overview The following settings are possible for DO sensors:

z Salinity correction

z Salinity (salinity equivalent)

z Calibration interval

z Comparison measurement

Measuring mode Reproducibility Response time

DO concentration better than 0.05 mg/l > 10 seconds

DO saturation in-

dex

better than 0.6 % > 10 seconds

DO partial pres-

sure

Better than 1.2 mbar > 10 seconds