| 摘要 |
978, 005. Electrolytic testing apparatus. BECKMAN INSTRUMENTS Inc. Aug. 29, 1962 [Dec. 12, 1961], No. 33087/62. Heading G1N. In an electro-chemical half-cell for measuring an ion concentration of liquid in a conduit 11, 12 the glass membrane 16 is a length of tubing sealed at each end to lengths 17, 18 of non ion sensitive, high impedance glass and pinched at the centre to increase the flow and thus reduce sediment deposit, a helical bristle brush 46 driven by the effect of flow on blades 47, 48; being provided to clean the inner surface of the membrane. A well buffered electrolyte solution is maintained in contact with the membrane by a glass tube 23 having an outlet through a ball 32 and socket 30 arrangement to an internal half-cell 28. A reference half-cell 54 is coupled to the flowing liquid by a similar ball and socket arrangement 55, 57. A protective mesh screen 35 which also provides electrical screening is seated in grooves 36, 37, in cups 25, 38 the latter of which is on sliding fit on the tube to allow for expansion. Glass tube 23 is also free to move at its top end, being sealed to tube 18 by 0 ring seals. An electric motor may be provided to assist rotation of the brush by the flowing fluid and may comprise a rotor within tube 18 and a stator outside. |
