Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
106 words
A gas analyzer comprising combustion means for producing combustion of a gas to be analyzed in an excess air environment, a body arranged to be heated by said combustion of the gas to be analyzed, temperature detecting means for producing an output signal representative of a temperature in said body, means for periodically interrupting the heating of said body after a first predetermined time period to allow a cooling of said body for a second predetermined time period and means for analyzing the temperature of said body during said first and second time periods to determine a representation of a relative calorific value of said gas.
Claim 2
Dependent Claim
106 words
A gas analyzer comprising combustion means for producing combustion of a gas to be analyzed in an excess air environment, a body arranged to be heated by said combustion of the gas to be analyzed, temperature detecting means for producing an output signal representative of a temperature in said body, means for periodically interrupting the heating of said body after a first predetermined time period to allow a cooling of said body for a second predetermined time period and means for analyzing the temperature of said body during said first and second time periods to determine a representation of a relative calorific value of said gas.
Claim 3
Dependent Claim
39 words
A gas analyzer as set forth in claim 1 wherein said means for periodically interrupting includes drive means arranged to selectively displace said combustion means with respect to said body to produce said heating and cooling of said body.
Claim 4
Dependent Claim
55 words
A gas analyzer as set forth in claim 1 wherein said means for periodically interrupting includes valve means controlling the flow of the gas to be analyzed and valve control means for periodically operating said valve means between an open state during said first time period and a closed state during said second time period.
Claim 5
Dependent Claim
65 words
A gas analyzer as set forth in claim 1 wherein said means for analyzing includes first means for measuring the temperature of said gas to be analyzed, second means for measuring the temperature of said air supplied to said combustion means and third means for correcting said output signal from said temperature detecting means in response to output signals from said first and second means.
Claim 6
Independent Claim
107 words
A method for determining the calorific value of a combustible gas including the steps of producing a combustion of the gas in an excess air mixture of gas and air, applying a flame produced by the combustion to raise the temperature of a heat-absorbing body, interrupting the application of the flame to the body, monitoring the heating and cooling of the body by the application and interruption of the flame thereto, correcting the heating and cooling temperatures by the temperatures of the gas and the air used for the combustion and analyzing the corrected temperatures as a representation of the relative calorific value of the combustible gas.
Claim 7
Independent Claim
107 words
A method for determining the calorific value of a combustible gas including the steps of producing a combustion of the gas in an excess air mixture of gas and air, applying a flame produced by the combustion to raise the temperature of a heat-absorbing body, interrupting the application of the flame to the body, monitoring the heating and cooling of the body by the application and interruption of the flame thereto, correcting the heating and cooling temperatures by the temperatures of the gas and the air used for the combustion and analyzing the corrected temperatures as a representation of the relative calorific value of the combustible gas.
Claim 8
Dependent Claim
32 words
A method as set forth in claim 5 wherein the step of analyzing the corrected temperatures includes the step of recording the waveshape of the heating and cooling process of the body.
Claim 9
Dependent Claim
110 words
A method as set forth in claim 5 and including the further steps of introducing a reference gas to produce the flame and using the temperature produced thereby to derive data for use in solving the following caloric equation, ##EQU2## where Q is the caloric value of the gas to be analyzed, Q 1 is the specific heat×mass×temperature gradient of the body, K is the thermal leakage modulus T is the highest temperature attained by the body T air is the incoming air temperature as corrected by the temperature of the incoming gas t is time in seconds, Q 2 is the additional heating or cooling provided by nearby devices.