Reply To: Is a safety valve required if the pump cannot exceed nominal pressure, and can the Hermetry alarm replace it?

Honestly, I had never considered thermal expansion. I explained it to my uncle with this example and he was convinced, so a PRV set to 6 bar was installed. I set up the alarm rule as you wrote it, only on the first day it gave two MAJOR alerts at 5.0 bar in the morning when the boiler kicked in, so I raised the debounce to 5 readings, and now it’s calm. The offline rule has been added too. Thanks a lot, Esra.