Auxiliary hygiene parameters and their special significance in the revised edition of DIN 19643

Published in June 2023, the latest version of DIN 19643-1 introduced new assessment criteria for chemical-physical water parameters. These criteria are divided into three categories in order to underscore their significance:

1. Critical auxiliary hygiene parameters: Free chlorine, pH value and REDOX potential. They play a decisive role in water hygiene.
2. Precautionary values requiring minimisation: These include bound chlorine, trihalomethane, chlorite/chlorate, bromate and arsenic. They require special attention in order to minimise potential risks.
3. Technical values requiring optimisation: These include turbidity, aluminium, iron, acid capacity, nitrate and TOC. They can be optimised to improve the quality of the water even further.

The auxiliary hygiene parameters are recorded and automatically controlled by the TOPAX MC water sampling station / multi-channel controller. Even during partial load operation, compliance with these parameters is crucial. If a value – such as that for free chlorine, pH value or REDOX potential in accordance with DIN 19643 – lies outside the specified limits, the TOPAX must reset the treatment installation to 100% via a contact output.

Efficient measurement and control technology is not only important for water hygiene, but also contributes to energy savings and promotes the careful use of chemicals. The TOPAX MC offers additional functions such as controlling the addition of flocculants and the option of setting high chlorination and similar processes. All data is documented digitally and stored on a USB flash drive. In addition, the Ethernet connection provides a digital connection, whilst the TopView 3 or 4 visualisation software enables the system to be monitored and controlled remotely.