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general information

biological operation

electronical operation

functional operation

detection limits

Present IT 2 software




In Situ
In Situ version


flow through
flow through version



Functional operation

The shell position of each mussel is measured during each period (adjustable between 10 and 600 seconds). The shell positions are translated internally by the micro computer via the software to a value of between 100 and 1000 units. These figures are internally evaluated according to fixed criteria. These criteria determine the sensitivity of the entire system and can be adjusted with the built-in, menu-driven computer program (using an external terminal to be fitted to the system).

The absolute values will vary from mussel to mussel as a result of their differing sizes, and are further dependent on the setting and adjustment of the electronics.

Using the minimum (0%) and the maximum (100%) values, measured individually for each mussel, the software calculates the current shell position, in percentages.

This facilitates a comparison of the individual behaviour of the different mussels, despite size differences (of the individual mussels) and adjustment differences (in the electronics).

If the fixed threshold values are crossed, an alarm is generated. This alarm closes a (potentialfree) alarm contact, which is connectable via the underwater connector.

The parameters defining the moment of generating an alarm are adjusted in the software (via a menu on a terminal to be connected).

Battery voltage and temperature are also measured in every measuring cycle. These values are available via the serial terminal connection.