Patent ID: 6644098
Filing Date: 2003-11-11
Classification: G01N

Abstract:
A gas detector, operative in conjunction with a power source, for sensing the presence of at least one predetermined gas, the gas detector comprising:a detection circuit, the detection circuit including a sensing device having first and second electrodes, wherein the first electrode is connected to the power source for heating the first electrode; a temperature controller operatively connectable to the detection circuit for maintaining a temperature of the first electrode at a predetermined magnitude; a current controller operatively connectable to the detection circuit for maintaining a electrical current in the second electrode at a predetermined magnitude; and a switch adjustable between at least two positions, wherein in a first switch position the temperature controller is operatively connected to the detection circuit and in a second switch position the current controller is operatively connected to the detection circuit, the position of the switch is determined on the basis of an operating condition of the gas detector.