Relay Module – 2 DCR (Dry-contact relays)
The optional Relay Module adds two programmable dry-contact relays. The open collector output in the 9900 base unit uses the Relay 1 setting. The optional Relay Module is assigned to relays 2 and 3 in the menus.
- The Direct Conductivity/Resistivity Module interfaces Signet 2819-2823 and 2839-2842 Conductivity electrodes directly to the 9900. The moduel also provides filtering and conditioning. (Conductivity/Resisitivity and Salinity measurements may also be performed via the 2850 Sensor Electronics connected through the 9900 Digital (S3L) intputs.)