ONLINE Configuration

The ONLINE configuration of the AQUATIC version of the MONITORING-PAM permits measurement of photosynthesis of submersed plants and macroalgae. The ONLINE configuration requires external power supply and is operated by a Windows computer. The interface MONI-IB4/LANS permits connection to a Windows computer via Ethernet, RS-232 or USB communication.

Up to four waterproof emitter-detector heads MONI-HEAD/S can be linked to the interface MONI-IB4/LANS. For this purpose, the interface provides four input sockets to connect underwater cables RS-485/S. The water depth of measuring sites is determined by the length of the RS-485/S underwater cables which is 10 m by default.

STAND-ALONE Configuration

The STAND-ALONE configuration of the AQUATIC version of the MONITORING-PAM is suited for long-term monitoring of chlorophyll fluorescence at water depths down to 75 m. The system consists of the waterproof battery-powered data acquisition system MONI-DA/S, the PC interface MONI-IB1/S, and up to seven waterproof emitter-detector heads MONI-HEAD/S.

The MONI-DA/S runs for more than 4 weeks on battery with seven MONI-HEAD/S connected and a saturation pulse interval of 15 minutes. Data are logged on an internal ring buffer and on a non-removable microSD card. Data are transferred from the MONI-DA/S to a computer via the interface MONI-IB1/S. Wireless data transfer is feasible using a watertight WiFi modem. The WiFi modem must be operated above the waterline because water absorbs the WiFi signal.