ABSTRACT
A zero adjustment is made after the outlet thermometer is sufficiently cool. Then the instrument is put on certified gas and allowed to come up to heat. At this point, a keyboard adjustment is made so that the SMART-CAL display indicates the certified calorific value. Ever since its invention in 1921, the Cutler Hammer recording calorimeter has utilized a stripchart recorder to display its instantaneous BTU and to provide a continuous BTU record. The keyboard is used again to put the calorimeter back onto line gas. Auto calibration is done without operator assistance. The microprocessor will control the transfer from line gas to calibrating gas. After an appropriate time for the instrument to stabilize on calibrating gas, the microprocessor will note any deviation and correct the SMART-CAL reading. The automatic averaging provided by SMART-CAL should achieve a higher degree of accuracy than the eyeballing of a stripchart or even the electronic chart averaging.
