G - Physics – 01 – P
Patent
G - Physics
01
P
324/3
G01P 21/00 (2006.01) G01D 18/00 (2006.01) G01N 27/416 (2006.01) G01R 35/00 (2006.01)
Patent
CA 1066772
ABSTRACT OF THE DISCLOSURE A continuous automatic calibration system and fault detection method for analytical instruments of the kind used for measuring constituents of a fluid sample which system includes a memory for storing reference information, a comparator circuit for continuously comparing the instrument output to the stored refer- ence information, and a sample-and-hold circuit charged positive or negative by the comparator, depending whether or not the instrument output exceeds the value of the reference information. The output of the sample-and-hold circuit in turn is coupled to the instrument continuously to adjust its output to correct value. Where the maximum allowed corrective range of the sample-and-hold circuit is exceeded by the signal from the comparator circuit beyond a predetermined time period, the system displays fault, warning the operator.
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