Tube disconnection warning device

Device for giving warning of the disconnection of a first tube from a second tube, comprising, in combination:

• first and second tubes having wall surfaces in abutting relationship, a source of gas under pressure, a pneumatic cell of the fully open-fully closed type having an input port, a control port, and first and second output ports, said first output port of said pneumatic cell being pressurized during the presence of pressure in said control port and said second output port of said pneumatic cell being pressurized during the absence of pressure in said control port, said source of gas being connected to said input port of said pneumatic cell, a sensing tube terminating at one end in at least one orifice opening, said opening being positioned between said abutting walls of the first and second tubes when they are normally connected, said sensing tube being connected at its opposite end to said control port of said pneumatic cell, a distributor having first, second, and third input ports and an output port, said first input port of said distributor connected to said source of gas, said second input port of said distributor connected to said first output port of said pneumatic cell, and said third input port of said distributor connected to said second output port of said pneumatic cell, said distributor including means for connecting the first input port and output port thereof in response to pressure in said third output port of said distributor and for disconnecting the first input port and output port thereof in response to pressure in said second input port in said distributor and at least one alarm means connected to the output of said distributor and responsive to pressure therein.