Flame detecting system
AssigneeAzbil Corporation
InventorRaita Mori
Life of this patent
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Abstract
A flame detecting system capable of easily performing a deterioration diagnosis of a flame sensor without being provided with a shutter mechanism. The flame detecting system comprising a flame sensor to detect light, a calculating device, and a reference light source, in which the calculating device, by operations of a central processing unit CPU, is configured to execute a first mode at which the discharge probability in the flame sensor is measured when the reference light source is turned off and a second mode at which the discharge probability in the flame sensor is measured when the reference light source is turned on, and calculate a current discharge probability of the flame sensor from data obtained at the first mode and the second mode.
Claims3
A flame detecting system comprising:
- a flame sensor configured to detect light;
- a calculating device;
- and
- a reference light source,
- wherein the calculating device comprises:
- an applied voltage generating portion configured to generate a pulse to drive the flame sensor,
- a voltage detecting portion configured to measure an electric signal flowing in the flame sensor,
- a storing portion configured to store sensitivity parameters of the flame sensor in advance, and
- a central processing unit configured to obtain a quantity of received light of flame using parameters of a known quantity of received light, a pulse width, and a discharge probability of the sensitivity parameters, and a discharge probability obtained from an actual pulse width and the measured number of discharge times, and
- wherein the central processing unit is configured to execute a first mode at which the discharge probability in the flame sensor is measured when the reference light source is turned off and a second mode at which the discharge probability in the flame sensor is measured when the reference light source is turned on, and calculate a current discharge probability of the flame sensor from data obtained at the first mode and the second mode.
Dependencies are inferred from the claim text.