LIQUID VOLUME MEASURING DEVICE AND URINE TEST INSTRUMENT

PROBLEM TO BE SOLVED: To provide a liquid volume measuring device for simultaneously satisfying miniaturization of the device, a low cost and high precision by having a resistor hardly directly receiving influence of polarization effect due to a liquid, and to provide an urine test instrument using it. SOLUTION: The urine test instrument 10 is composed of a liquid volume measuring device 12 for measuring an amount of urine L sampled in a vessel 11 with a constant cross section area; a salt sensor part 14 for measuring salt concentration in the urine L; a salt concentration detection part (concentration detection part) 15 for calculating the salt concentration by driving and measuring the sensor part; and a salt calculation part 16 for calculating an amount of salt in the urine L from the amount of the urine L and the salt concentration. The liquid volume measuring device 12 comprises a measuring part 30 inserted in the vessel 11; a power source part 32 for applying alternating voltage on the measuring part 30; a resistance measuring part 34 for measuring electric resistance of the measuring part 30; and a liquid volume calculation part 36 for calculating a liquid volume from an analytical curve of a resistant value vs liquid volume prepared previously on the basis of measured electric resistant change. COPYRIGHT: (C)2004,JPO&NCIPI