| 摘要 |
1,241,806. pH measuring apparatus. MATSUSHITA ELECTRIC INDUSTRIAL CO. Ltd. Oct.24, 1968 [Oct.24, 1967], No.50484/68. Heading G1N. A pH sensor includes a housing 12 divided into two chambers, a glass electrode assembly 2 having an inner electrode 4 being sealed in one chamber and the second chamber being filled with an electrolytic salt 16 and provided with an inner electrode 8. The housing is closed by a lower panel 9 having terminals 23, 25 to which the electrodes 4 and 8 are connected and the second chamber is provided with a cover 18 having either two holes, one being closed by a pervious material e.g. cork, the other by a rubber closure so that water may be injected into the chamber, or one hole closed with a vinyl sponge closure which serves the same purpose as the two closures mentioned above. The glass electrode 2 has a porous bulb and is filled with a buffer solution having a pH value of 7. The housing, which is made of material which is impervious to water and is electrically insulating, may be provided with a protective cover (29), for the glass electrode, Fig. 7 (not shown) and may also be screwed into a casing containing an oscillator circuit, Fig. 6 (not shown). The sensor can then be swallowed by a person and the pH value of the contents of the stomach or intestines measured remotely by measuring the modulation of the signal from the oscillator due to electrical response of the sensor. |
