公开(公告)号：JPH05126819A

公开(公告)日：1993-05-21

申请号：JP31839691

申请日：1991-11-06

Applicant: TOA ELECTRONICS ,  MORINAGA MILK INDUSTRY CO LTD

Inventor： HAKETA YASUSHI ,  SHINNO TETSUHISA ,  MOTOHASHI RYOICHI ,  KANZAKI MIKIO ,  WATANABE HIROTAKA ,  FUJIOKA SEIICHI

IPC: G01N27/06 ,  G01N27/26 ,  G01N33/04

Abstract: PURPOSE:To obtain the method and the apparatus for measuring the acidity, the L-lactic-acid concentration and the D-lactic-acid concentration of fermented milk at the same time. CONSTITUTION:The acidity of the sample, which is sampled from fermented milk, is measured with an acidity measuring device having a conductivity electrode 24 and the like. The L-lactic-acid concentration of the sample is measured with an L-lactic-acid-concentration measuring device having an L-lactic-acid electrode 34 and the like. The added amount of the L-lactic-acid concentration of the fermented milk, which is measured with the L-lactic-acid concentration measuring device, and the acidity of raw material milk, which is measured beforehand, is subtracted from the acidity of the fermented milk, which is measured with the acidity measuring device, with a computer device 38, which is connected to the acidity measuring device and the L-lactic-acid concentration measuring device. Thus, the D-lactic-acid concentration of the fermented milk is computed and obtained.

公开(公告)号：JPH07181161A

公开(公告)日：1995-07-21

申请号：JP34658793

申请日：1993-12-22

Applicant: TOA ELECTRONICS

Inventor： SHINNO TETSUHISA ,  OGAWA NOBUHIRO ,  UENO TADAAKI ,  KOBAYASHI KANEO

IPC: G01N27/26

Abstract: PURPOSE:To obtain the concentration meter which is operated stably in an automatic operation and whose reliability is enhanced by a method wherein the difference between an electromotive force in a calibrating operation at a low concentration and that in a previous calibrating operation, a generated electromotive force per pX in a calibrating operation, the stability of an electromotive force in a calibrating operation at a highconcentration and the responsivity in the calibrating operation at the high concentration are established as a rule and a fuzzy operation is performed. CONSTITUTION:Electric signals from individual electrodes 2, 4, 6 in a measuring cell 8 are amplified by an analog amplifier, they are converted into digital signals by an A/D converter 100, and the digital signals are input to a control part 102 provided with a microcomputer. The control part 102 controls a driver circuit 104, and it performs a fuzzy operation in order to obtain the sensitivity of the electrodes, the date and time of a calibrating operation and the like. Then, four elements, i.e., the difference between an electromotive force in a calibrating operation at a low concentration and that in a previous calibrating operation, a generated electromotive force per pX in a calibrating operation, the stability of an electromotive force in a calibrating operation at a high concentration and the responsivity of the calibrating operation at the high concentration, are established as a rule, a fuzzy operation is performed, the present sensitivity of the electrodes is found, a period of time during which reliable data can be measured on the basis of the sensitivity is estimated, and the date and time of a next calibrating operation is set.