What is a Dry Sprinkler Valve?
-- When a fire starts burning in a building, action needs to be taken early... before the fire has grown out of control. Taking this action, sometimes before anyone even... Read More
What is a Waterflow Switch?
-- The fire alarm waterflow switch, a delayed action mechanical/electrical assembly, is a conventionally wired fire alarm device. The fire department reacts... Read More
Why Does Closing Some Gatevalves Show Trouble?
-- Early on, the concept of a silent alarm that did not call the firefighters (that's what a supervisory alarm basically is) was considered to be on the same level as a broken wire in the fire alarm system. It was a condition that needed to be fixed without evacuating the building... Read More
What is Causing The False Waterflow Alarms?
-- Alarms for a sprinkler system usually are sent to the fire alarm system when water actually pushed past a paddle across the inside of the sprinkler pipe. This paddle pushes on a switch -waterflow switch- which sends in the alarm. To reduce false alarms, there is an air damper between the paddle and the switch requiring the paddle to sense water-is-flowing for... Read More
Why does the Jockey Pump Run So Often?
-- The jockey pump is controlled by a separate controller from the main fire pump. Many times, the jockey control box is a separate control box, and is not monitored by the fire alarm system because the jockey pump isn't needed for fire suppression. The only purpose of the jockey pump is to keep the pressure in the sprinkler system high enough that the main fire pump will not turn on... Read More
Can a Waterflow Switch and a Tamper Switch be on the Same Zone?
-- In the olden days there was no such thing as a supervisory signal. In order to detect a closed valve, the tamper switch would -break- the wire going to the waterflow switch's end of line resistor. This tamper switch action causes a -trouble- for the fire alarm system. Of course, there was a requirement that closing any valve tamper switch could not prevent a flow switch from...Read More
Why Are There False Waterflow Alarms?
-- The question was asked "Intermittently, we are having a false waterflow alarm problem. For a while, it was OK, but we did the annual waterflow test and since then we get at least once a week a false water flow alarm ... Read More