Patent ID: 9186609
Filing Date: 2015-11-17
Classification: B01D,F24F

Abstract:
1. A filter clog detection system for a gas filter in a gas conduit operatively attached to a gas blower having power to produce a gas flow, comprising: a sensing system that measures a property within the conduit based upon a flow of gas into the sensing system from outside the gas conduit, wherein a condition of the gas filter affects the value of the measured property; a controller, including a memory that stores electronic information therein and a processor executing program instructions, that obtains a first measurement of the property when the gas filter is in a first state, obtains a second measurement of the property when the gas filter is in a second state, and compares the first measurement and the second measurement; wherein the sensing system comprises a sensing tube formed with an opening at two ends, and a plate attached to the sensing tube, the sensing tube having an inlet as one of the openings that receives gas flow from outside the gas conduit, and an outlet as the other opening that allows gas to flow into the gas conduit; wherein the sensing system further comprises a first sensor linked with a heater that provides energy to the first sensor; a second sensor that senses a first temperature within the sensing tube, wherein the first sensor and second sensor are positioned inside the sensing tube and exposed to gas flowing through the sensing tube, wherein the heater increases voltage to the first sensor as air velocity moving through the sensing tube increases; wherein the first temperature is the temperature of gas in the sensing tube, and the measured property is the voltage for raising the temperature of the first sensor to a second temperature that is a fixed number of degrees above the first temperature; and processor means for comparing the difference between the first measurement and the second measurement to a stored value in order to validate the second measurement.