Method of calibrating temperature-measuring resistors on a glass, glass-ceramic, or similar substrate
First Claim
1. A method of calibrating a temperature-measuring resistor applied to a substrate made of glass or glass-ceramic material, said temperature-measuring resistor consisting of a conductor strip resistor whose resistive properties change with time in operation, said method of calibrating said temperature-measuring resistor comprising the steps of:
- a) measuring a resistance value of the temperature-dependent resistor to obtain a measured resistance value for the temperature-dependent resistor; and
b) determining a temperature of the temperature-dependent resistor at which said measured resistance value was obtained during step a) by measuring a temperature-dependent electrical resistance of said substrate, whereby a temperature-resistance characteristic curve is obtained for the temperature-measuring resistor.
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Abstract
The method of calibrating temperature-measuring resistors on substrates made of glass, glass-ceramics or similar materials, especially conductor strip resistors on glass-ceramic cooking surfaces, includes measuring a temperature associated with a measured resistance value obtained using the temperature-measuring resistor by determining a temperature-dependent electrical resistance of the substrate material, in order to obtain a temperature-resistance characteristic curve for the temperature-measuring resistor.
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Citations
9 Claims
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1. A method of calibrating a temperature-measuring resistor applied to a substrate made of glass or glass-ceramic material, said temperature-measuring resistor consisting of a conductor strip resistor whose resistive properties change with time in operation, said method of calibrating said temperature-measuring resistor comprising the steps of:
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a) measuring a resistance value of the temperature-dependent resistor to obtain a measured resistance value for the temperature-dependent resistor; and b) determining a temperature of the temperature-dependent resistor at which said measured resistance value was obtained during step a) by measuring a temperature-dependent electrical resistance of said substrate, whereby a temperature-resistance characteristic curve is obtained for the temperature-measuring resistor. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of calibrating a temperature-measuring resistor applied to a substrate made of glass or glass-ceramic material, said temperature-measuring resistor consisting of a first conductor strip resistor whose resistive properties change with time in operation, said method of calibrating said temperature-measuring resistor comprising the steps of:
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a) applying a second conductor strip resistor to said substrate so that said second conductor strip is spaced from said first conductor strip resistor; b) applying a glass-ceramic temperature-measuring resistor to the substrate between said first and second conductor strip resistors so as to contact both of said first and second conductor strip resistors; c) measuring a resistance value of the temperature-measuring resistor to obtain a measured resistance value for the temperature-measuring resistor; and d) determining a temperature of the temperature-measuring resistor at which said measured resistance value was obtained during step c) by measuring a temperature-dependent electrical resistance of said glass-ceramic temperature-measuring resistor, whereby a temperature-resistance characteristic curve is obtained for the temperature-measuring resistor.
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9. A method of calibrating a temperature-measuring resistor applied to a substrate made of glass or glass-ceramic material, said temperature-measuring resistor consisting of a conductor strip resistor whose resistive properties change with time in operation, said method of calibrating said temperature-measuring resistor comprising the steps of:
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a) providing a mathematical equation expressing a linear relationship between resistance of the temperature-measuring resistor and temperature of the temperature-measuring resistor and including a number of temperature-independent parameters, wherein said mathematical equation is;
space="preserve" listing-type="equation">R.sub.LB =R.sub.20 ·
(1+α
.sub.20 (T.sub.LB -20)),and wherein said R20 and α
20 are said temperature-independent parameters, RLB is the resistance of the temperature-measuring resistor and TLB is the temperature of the temperature-measuring resistor;b) measuring resistance values (RLB) of said temperature-measuring resistor at two calibration temperatures (TLB) above 250°
C.;c) determining each of said calibration temperatures (TLB) from measured resistance values of said substrate at said calibration temperatures and a predetermined relationship between substrate resistance and substrate temperature in a temperature range above 250°
C.;d) inserting respective ones of said resistance values (RLB) measured in step b) and corresponding ones of said calibration temperatures (TLB) determined in step c) in said mathematical equation to obtain a system of equations for said temperature-independent parameters R20 and α
20 ; ande) solving said system of equations for said temperature-independent parameters R20 and α
20 ;so that said temperature of the temperature-measuring resistor is obtained from said resistance of the temperature-measuring resistor under 250°
C. by solving said mathematical equation with said resistance of the temperature-measuring resistor and said temperature-independent parameters obtained in step e) inserted in said mathematical equation.
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Specification