Oxy-acetylene work apparatus and method for determining the operating time of said apparatus

An oxyacetylene type work apparatus comprising:

• a first container containing acetylene;
• a first pressure gauge configured to measure the pressure in the first container, said first pressure gauge comprising a first dial and a first pressure indicator, said first pressure indicator being rotatable relative to said first dial;
• a first two-dimensional marking disposed on the first dial, said first pressure indicator configured to adopt a plurality of angular positions relative to said first marking according to the value of the pressure in the first container;
• a second container containing oxygen;
• a second pressure gauge configured to measure the pressure in the second container, said second pressure gauge comprising a second dial and a second pressure indicator, said second pressure indicator being rotatable relative to said second dial;
• a second two-dimensional marking disposed on the second dial, said second pressure indicator configured to adopt a plurality of angular positions relative to said second marking according to the value of the pressure in the second container;
• an image capturing device configured to produce images of the first pressure gauge and of the second pressure gauge;
• an electronic logic circuit configured to process said images of the first and second pressure gauges thereby determining the respective angular positions of the first and second pressure indicators relative to the first and second two-dimensional markings and to deduce from said angular positions the pressure values measured by the first and second pressure gauges, respectively,
• a sensor configured to measure the temperature of the first acetylene container,
• wherein the electronic logic circuit is configured to:
• determine the residual amount of acetylene in the first container, in accordance with a predetermined initial amount of acetylene in the first container, the value of the temperature of the first container measured by the sensor and the value of the pressure measured by the first pressure gauge;
• and
• determine the residual amount of oxygen in the second container, in accordance with a predetermined initial amount of oxygen in the second container and the value of the pressure measured by the second pressure gauge.