Pressure switch : FF 4 for firefighting equipment, VdS - certified
for firefighting equipment;
VdS-approval
Description
FF 4-.. VdS are approved for use in fixed watersprinkler installations by the German Association of Insurers 4-2 VdS is a typical alarm pressure switch. The setting range is limited
to 1 bar. Differential lever and spring are omitted to assure a minimum resetting differential.. FF 4-10 VdS and FF 4-16 VdS pressure switches limit the differential to 1.5 bar maximum