ELECTROSTATIC CAPACITY TYPE ALCOHOL CONCENTRATION MEASURING INSTRUMENT

摘要

PURPOSE:To allow the abolishment of a temp. correcting device to be externally mounted by building a temp. sensor into the circuit on an alcohol concn. measuring side and executing the temp. correction in the alcohol concn. measuring instrument. CONSTITUTION:The alcohol concn. measuring instrument 31 has a temp. correcting circuit 36 including a posister 35 as the temp. sensor in addition to an electrostatic capacity detector 32, an oscillation circuit 33 and an f/V converting circuit 34. The temp. detected by the posister 35 and the output voltage from the f/V converting circuit 34 are inputted to the temp. correcting circuit 36 by which the inclination of the output voltage is corrected in correspondence to the detected temp. with the prescribed alcohol concn. value as a reference point and can be corrected to the output voltage value at a standard temp. The corrected output voltage value is supplied to a control unit 44. Since the temp. correction is executed in the concn. measuring instrument 31 in such a manner, the temp. correcting device to be externally mounted is abolished.