Fire sprinkler system pressure difference, the pressure switch in the fire control center alarm, but the hydraulic alarm did not alarm
B, when the double-contact pressure switch, the problem is simple, as long as a group of contacts wiring to the spray pump control cabinet, another group of contacts connected to the alarm host. Now the actual engineering applications, double contact pressure switch with more and more.
2, if the alarm system, the pressure switch must both alarm to the alarm host should also start the spray pump, specifically now two methods: A when the single-contact pressure switch, to add an intermediate relay , Then need 24V power supply, through the relay, a route to the spray pump control cabinet, another way to the alarm host.
"Automatic sprinkler system design specifications" GB 50084-2001 (2005 edition) in Article 11..1 1 provides: "wet system, dry system nozzle action, the pressure switch should be directly linked to automatically start the water pump" The
The current pressure switch directly Kai pump generally have the following two ways:
1, the project no alarm system, only the sprinkler system, then the pressure switch control circuit just in the spray pump control within the passive contact.
