In condensate and feed water tanks, etc.
NRG 11-1, PN 6, G1, 4 switching points, PP on/off, flooding, dry run
NRGS 16-1, PN 40, G1, 4 switching points
NRG 11-2, PN 6, G1, 3 switching points, PP on/off, lack of water for low pressure steam boilers up to 0.5 bar
