Service water

Legionella monitoring continuously checks whether the service water maintains the required temperature. In the Kögelhof biogas plant example, the service water is heated to at least 60 degrees Celsius to prevent legionella from multiplying. Sensors measure the flow and return temperatures at the feed point and in the school building. If a value drops, the operator is alerted automatically.

Temperature sensors at several measuring points continuously report their values to an IoT platform, which raises an alarm automatically if temperatures fall too low. In Mochenwangen, the ifm io-key sends the values from the school via cellular network to the moneo cloud, even without existing network infrastructure. Limit values for flow, return and their difference are stored there. A control display also shows the values on site.

The return temperature shows whether enough heat still arrives at the end of the pipe and whether the service water stays hygienic. In Mochenwangen, sensors in the school record the inlet and outlet temperatures at the plate heat exchanger. If the incoming heat, the difference between flow and return, or the return temperature of the service water falls too far, operator Hermann Müller is alerted automatically. This prevents temperature fluctuations in the classrooms.

Monitoring service water safeguards hygiene and supply and shows where water is being used. In the district heating network in Mochenwangen, the water in the school building stays safe and hygienic because temperature drops are reported immediately. In manufacturing, ifm makes consumption of water, electricity and compressed air visible at a glance. Recording the data automatically saves walking time and reveals where individual machines need attention.