Pressure indicator and alarm

摘要

A device to be used in conjunction with oxygen cylinders or other gas cylinders which will sound a warning and/or flash a light when the gas supply is running low and the cylinder is in need of replacement. A pin is inserted through a lens which normally is placed over a gas gauge dial wherein the gauge dial has a standard indicator arm which moves when the pressure decreases. When the indicator arm moves, normally in a counterclockwise direction, it will make contact with the pin when the level in the tank has been reduced to a point where it should be replaced. This will then complete an electrical circuit which would cause an alarm to sound and/or a light to flash. The circuit comprises essentially two lead wires each connected to a battery with one of the leads connected to a metal part of the regulator and another lead connected to the pin associated with the gauge. Any suitable device, such as alligator clips, may be used to connect one wire to the pin and the other wire to the metal part of the regulator.