摘要:
An improved, affordable, and rapid fluid mixture composition or process monitor based on a thermal microstructure sensor. This is preferably accomplished with a microbridge sensor design that has reduced susceptibility to interfering components of the mixture. The sensor described herein is therefore suitable for monitoring the concentration of at least one component in a fluid mixture when the fluid mixture consists of either (1) two components with very different thermal conductivities; or (2) three or more components wherein at least one component has a very different thermal conductivity and the effects of the other components can be largely eliminated, especially if the component of interest is hydrogen and the interference is from the variability in the concentrations of CO2 and H2O.
摘要:
A gas meter (10) determining the calorific value of the gas passing through the meter is disclosed. The meter includes a reaction chamber (28) that draws gas from the gas flow path and an air intake (30). The calorific value is determined using a resistor (36), coated with a catalyst material, that forms part of a wheatstone bridge circuit. Oxidation of the gas/air mixture on the surface of the resistor (36) causes a temperature and resistance change dependent on the calorific value of the gas that can be detected by the wheatstone bridge.
摘要:
A CO2 concentration measurement device (Fig. 3) having volumetric sensing means (14), true O2 sensing means (11) and processing means (16). The measurement device is adapted to sense two signals, firstly, a signal which measures true O2 over the concentration, and a signal which measures CO2 enhanced O2 concentration. The processor calculates the difference between the CO2 enhanced O2 concentration and the true O2 concentration and provides an appropriately calibrated indication of the CO2 concentration of the environment. The invention also relates to a total environmental monitor incorporating the abovementioned CO2 concentration measurement device, and optionally, a CH4 measurement device.
摘要:
Die Sensoranordnung enthält einen mit einer Katalysatorschicht (9) versehenen Transistor (20). Der Nachweis der Gase erfolgt über die Temperaturerhöhung des Transistors (20) infolge einer exotermen, katalytischen Reaktion an der Katalysatoroberfläche, wobei die Katalysatorschicht (9) eine vorbestimmte Betriebstemperatur haben muß. Die Katalysatorschicht (9) wird durch die Verlustleistung des Transistors (20), der als Sensor wirkt, oder durch die Verlustleistung eines Heiztransistors (11) geheizt.
摘要:
A gas concentration sensor which comprises a reaction chamber having a catalyst layer and a gas temperature sensor, and which can detect a CO concentration in a reformed gas passing the reaction chamber by means of a signal from the temperature sensor involving the gas, whereby providing a means of capable of detecting a CO concentration in a reformed gas inexpensively and reliably, and a hydrogen purification unit capable of satisfactorily delivering the function of a CO purifying catalyst.
摘要:
The invention relates to a sensor (40) for monitoring and controlling catalysts, especially motor vehicle catalysts, and to a method for controlling the operation of a catalyst, especially a catalyst used in emission purification systems in motor vehicles. According to the invention, the sensor (40) is embodied as a temperature probe which is provided with a catalytic coating (50). According to the inventive method, in order to carry out the control, a catalytically coated temperature probe (40) is used, at least partial quantities and/or the type of reagents supplied to the catalyst being controlled by said sensor (40). The invention can be applied in a general manner to the monitoring and/or control of catalytic processes, especially for monitoring and controlling the catalytically supported emission purification in motor vehicles.
摘要:
The invention concerns a method and a sensor for measuring gas concentrations. The sensor according to the invention comprises an element (A1, 5) which is sensitive to a chemical reaction of the gas being measured and means for measuring (13) the temperature of the element (A1, 5) sensitive to a chemical reaction of the gas being measured. According to the invention, the temperature-measuring means (TP1, TP2) are constituted by several series-connected thermopairs (13).
摘要:
The invention concerns a method and a sensor for measuring gas concentrations. The sensor according to the invention comprises an element (A1, 5) which is sensitive to a chemical reaction of the gas being measured and means for measuring (13) the temperature of the element (A1, 5) sensitive to a chemical reaction of the gas being measured. According to the invention, the temperature-measuring means (TP1, TP2) are constituted by several series-connected thermopairs (13).
摘要:
A gas meter (10) determining the calorific value of the gas passing through the meter is disclosed. The meter includes a reaction chamber (28) that draws gas from the gas flow path and an air intake (30). The calorific value is determined using a resistor (36), coated with a catalyst material, that forms part of a wheatstone bridge circuit. Oxidation of the gas/air mixture on the surface of the resistor (36) causes a temperature and resistance change dependent on the calorific value of the gas that can be detected by the wheatstone bridge.