A gas sensor with multi-level sensitivity circuitry

G - Physics – 01 – N

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G01N 27/16 (2006.01) G01N 33/00 (2006.01)

Patent

CA 2238464

A combustible gas detector or sensors having a multi-level sensitivity circuitry. The gas detector has a bridge circuit for outputing voltages indicative of gas concentrations contacting the bridge circuit. There is a power supply node electrically coupled to one end of the bridge circuit. There is also a voltage control circuit, coupled between the bridge circuit and the power supply node, for controlling when at least a low and high input voltage level is supplied to the bridge circuit so that the bridge circuit has at least two levels of gas concentration discernability. The bridge circuit outputs distinguishable voltage levels for high gas concentrations in response to receiving the low voltage level. Additionally, the bridge circuit outputs distinguishable voltage levels for low gas concentrations in response to receiving the high voltage level.

Détecteur de gaz combustible à montage électrique possédant différents niveaux de sensibilité, et comportant un montage en pont dont les tensions de sortie sont révélatrices des concentrations de gaz avec lesquelles il est en contact. Une source de courant est reliée à une des extrémités du pont. Un circuit de contrôle de tension est relié entre cette source de courant et le pont pour déterminer au moins si le pont est alimenté en basse tension ou en haute tension, de manière que le pont serve à déceler au moins deux concentrations de gaz. Lorsque le pont reçoit un courant de faible tension, les tensions de sortie du pont sont sensiblement différentes en présence de concentrations élevées de gaz. Lorsque le pont reçoit un courant de tension élevée, les tensions de sortie du pont sont sensiblement différentes en présence de faibles concentrations de gaz.

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