Pressure alarm and method of operation for sewage treatment system

A pressure alarm for sensing high water in a sewage treatment system having an air supply conduit and a compressor or blower connected to the air supply conduit for supplying air to the system at a selected air pressure, said pressure alarm comprising pressure-sensing alarm means pneumatically connected to the air supply conduit;

• pressure-reducing apparatus characterized by a nipple seated in the air supply conduit;
• at least one air bypass opening provided in said nipple, said air bypass opening provided in air-communication with the air conduit;
• a float disposed beneath said nipple and a shaft extending from said float through said nipple;
• and air deflector means provided on said shaft for normally seating in said nipple in a first configuration when water in the sewage treatment system is lower than said float, said air deflector means extending from said nipple and deflecting air from said air conduit through said air bypass opening and activating said pressure-sensing alarm means in a second configuration when water in the sewage treatment system is floating said float.

A pressure alarm for sensing high water in a waste-water treatment system having an air supply conduit and a blower or compressor connected to the air supply conduit for supplying air to the system, said pressure alarm comprising:

• (a) a pressure-sensing alarm apparatus characterized by a pressure-sensing switch pneumatically connected to the air supply conduit;
• a pressure-sensing circuit electrically connected to said pressure-sensing switch and to a source of electric power;
• and alarm means provided in said pressure-sensing circuit, whereby air pressure provided by the blower or compressor in said air supply conduit is applied to said pressure-sensing switch;
• and
• (b) a pressure-reducing apparatus characterized by an elbow provided in the air supply conduit;
• a nipple provided in said elbow;
• a float disposed beneath said nipple and a float neck extending from said float through said nipple;
• an air deflector provided on said float neck and seal means provided on said air deflector for normally seating said seal means on said nipple in a first configuration when water is lower than said float, said air deflector and said seal means extending from said nipple into said elbow in a second configuration when water floats said float, whereby air pressure in said air supply conduit is reduced by said air deflector and said pressure-sensing switch operates said pressure-sensing circuit to actuate said alarm means responsive to the reduction in air pressure in the air supply conduit in said second configuration.