Mechanical Pressure switch with perbunan diaphragm
Pressure connector: I (G 1/2“ Female thread, DIN 1725/2), ALSi 12.
FF 4-2 VdS, typical alarm pressure switch. The setting range is limited to 1 bar
FF4-2VdS DRI, typical alarm pressure switch with manual reset
FF 4-10 VdS and FF 4-16 VdS pressure switches limit the differential to 1.5 bar maximum
All FF 4-... VdS used in fixed for water extinguishing systems, VdS-approved
