Installing this stand-alone device is very easy. We have the right solution for you, whether as a simple relay output for the connection of PLC (NB220 H), as a stand-alone solution with an additional integrated optical and acoustical alarm (NB 220 QS and NB 220 QSF), or even with switched 230 V to directly connect an electrical consumer i.e. a pump (NB 220 QS).