Schematic representation of the ion flow in an EDI system
The second hospital had conventional water treatment with a dual softening system, a reverse osmosis system and two full demineralisation cartridges (referred to below as filters 1 and 2), as shown in the diagram above.
Excessive values of silicate downstream of filter 1 were repeatedly measured here, as the filter capacity was exhausted. In this case, the Testomat® 808 SiO2 automatically switches over to filter 2 (police filter) and signals the breakthrough. This was output via the RS232 interface. A notification via the internal current loop with a fixed value of 8 mA would also have been possible.
After the exhausted filter was replaced, the system operated smoothly again with the first filter until the next exhaustion.
The second filter never became exhausted, as the personnel were always informed in good time via limit value indication, with the result that the Testomat® 808 SiO2 did not have to trigger an alarm and stop the supply of process water.
Analysis values at various points in the water treatment.