G - Physics – 01 – K
Patent
G - Physics
01
K
340/156, 73/63
G01K 7/02 (2006.01) G01K 1/02 (2006.01) G01K 7/10 (2006.01)
Patent
CA 1084729
ABSTRACT OF THE DISCLOSURE A plurality of thermocouples are connected to reading circuit conductors at an isothermal junction block, for selec- tive connection to the input of an operational amplifier. The resulting output signals from the operational amplifier are moni- tored and stored in a computer. A reference thermocouple is se- lectively connected to the operational amplifier through a refer- ence junction compensator -- the reference junction compensator provides a compensated connection of the reference thermocouple with the reading circuit conductors. The signal at the output of the operational amplifier when the reference thermocouple is connected at the input is also monitored by the computer and stored for processing. In the computer, the signal sensed and stored when the reference thermocouple is connected to the oper- ational amplifier is subtracted from the sensed, stored signals generated when the other thermocouples are connected to the oper- ational amplifier. This subtraction nullifies the offset error of the operational amplifier (and the offset error of other read- ing circuit electronics such as the multiplexer selectively con- necting the thermocouples to the operational amplifier), and it corrects the temperature indications of the thermocouples by eliminating the error of the cold junction at the isothermal junction block. These corrections are inherent, and are main- tained without any surveillance or periodic adjustment.
299380
Nitschke John S.
Smart & Biggar
LandOfFree
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