The Direct Conductivity/Resistivity Module interfaces Signet 2819-2823 and 2839-2842 Conductivity electrodes directly to the 9900. The module also provides filtering and conditioning. (Conductivity/ Resistivity and Salinity measurements may also be performed via the 2850 Sensor Electronics connected through the 9900 Digital (S3L) inputs.).
Advantages:
Provides filtering and conditioning
Sensor cable length can be extended to 30 m (100 ft) (except 2819/2839: 4.6 m (15 ft) max for >10 MΩ, no splices).
