US 12,268,911 B2
Sprinkler bulb
Mikolaj Jakub Sadek, Gdansk (PL); Nazar Krutskevych, Pomorske (PL); and Wojciech Dominik Zimny, Gdansk (PL)
Assigned to MARIOFF CORPORATION OY, Vantaa (FI)
Filed by Marioff Corporation Oy, Vantaa (FI)
Filed on Jun. 16, 2020, as Appl. No. 16/902,975.
Claims priority of application No. 19180660 (EP), filed on Jun. 17, 2019.
Prior Publication US 2020/0391064 A1, Dec. 17, 2020
Int. Cl. A62C 37/50 (2006.01); A62C 37/11 (2006.01); G01L 9/00 (2006.01)
CPC A62C 37/50 (2013.01) [A62C 37/11 (2013.01); G01L 9/0005 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A sprinkler bulb comprising a sealed frangible housing (110), and a circuit device (120) sealed within the housing and without external wired connections, wherein the circuit device comprises:
a capacitor (150) within the housing (110) arranged to be used as a pressure sensor to detect pressure changes within the housing (110);
a heating element operable to heat fluid within the housing of the sprinkler bulb, and
a control unit configured to monitor changes in the capacitance of the capacitor and thereby use the capacitor as a pressure sensor.