Pressure-loss over temperature sensor
OwnerKurt Stoll, A. C. Ferf-Jentinkinventors
Life of this patent
Estimating the term…
Abstract
A pneumatic temperature sensitive system has a hollow detector member laid in a loop for instance in the room. The detector member is pressurized so that when the critical temperature is reached the detector member bursts and its interior space is depressurized. The detector member is connected with a pressure sensor to produce an electrical or other signal when the pressure falls so that further equipment may be activated.
Claims20
A surveillance system in the form of a pneumatic circuit designed for monitoring the temperature of an object and providing at least one signal when said object attains a critical temperature, said system comprising a detector member placed for sensing the temperature of said object, said detector member having a cavity therein, a pressure supply means for pressurizing this cavity of said detector member with air, said detector member being adapted to open on reaching said critical temperature to release air from it into the surroundings, a sensor connected with said cavity in said detector member and adapted to respond to a pressure drop in said cavity on the opening of said detector member and to produce a response signal, said pressure supply means being provided for pressurizing said cavity, a pressure testing valve for monitoring the internal pressure of said cavity, a duct connected with said pressure supply means and with said detector member at two respective connection points, said sensor being connected at a point between said two points, a choke placed on said duct between said sensor and said pressure supply means, at least one check valve placed between said pressure supply means and said sensor, said check valve being adapted to permit air flow towards said detector member, further comprising a prismatic aluminium carrier with at least two such sensors mounted thereon to form a modular surveillance unit adapted to be connected on the one hand with said pressure supply means and on the other hand with a number of detector members equal to the number of sensors.
A surveillance system in the form of a pneumatic circuit designed for monitoring the temperature of a building area, comprising a slab-shaped carrier having one supply duct and two feed ducts therein, a hollow detector member connected to each feed duct, each detector member being structured to rupture upon the occurrence of a critical temperature and defining a hollow interior space for receiving a pressurized medium which is released to the surrounding when the detector member ruptures, pressure supply means connected to said supply duct for supplying said pressurized medium to said supply duct, a connecting duct connected between said supply duct and each of said feed ducts, a choke in each connecting duct for choking a flow of pressure medium from said supply duct to each of said feed ducts, a check valve in each connecting duct for permitting flow of pressurized medium only from said supply duct to each of said feed ducts, a sensor duct connected to each of said feed ducts, and a sensor connected to each of said sensor ducts for sensing a drop in the pressure of said pressurized medium in each feed duct and for generating a signal upon the occurrence of the drop in pressure, whereby with pressurized medium being supplied by said pressure duct through said check valve and said choke, said feed ducts maintain a pressure of pressurized medium and, upon failure of said pressure supply means, the pressure in said feed ducts are maintained by said check valves, said slab-like carrier forming a modular unit carrying said sensors, check valves and choke, said pressure supply means and said detector members extending outside of said carrier and being connected to said carrier.
A surveillance system in the form of a pneumatic circuit designed for monitoring the temperature of an object and providing at least one signal when said object attains a critical temperature, said system comprising a detector member placed for sensing the temperature of said object, said detector member having a cavity therein, pressure supply means for pressurizing this cavity of said detector member with air, said detector member being adapted to open on reaching said critical temperature to release air from it into the surroundings, a sensor connected with said cavity in said detector member and adapted to respond to a pressure drop in said cavity on the opening of said detector member and to produce a response signal, a shut-off valve placed between said pressure supply means and said detector member, said shut-off valve being adapted to automatically shut off said pressure supply means from said detector member when the pressure supplied by said pressure supply means falls below a given valve.
Dependencies are inferred from the claim text.