Continuous pH meter

Details Continuous pH meter Continuous pH meter

1980-06-06

1981-09-08

Kaplan, G. L.

Chemistry: electrical and wave energy

Processes and products

Vacuum arc discharge coating

204195G, 324438, G01N 2738

Patent

active

042883083

ABSTRACT:
A glass pH measuring electrode is mounted in a piston that reciprocates in a chamber which is in fluid communication with a reference electrode. Intake and outlet lines to the chamber are controlled by valves. A drive means operates the piston and the valves to pull successive liquid samples into the chamber for measurement and then to discharge them. The drive means also controls two positive displacement pumps, one of which feeds controlled amounts of electrolyte past the reference electrode and the other feeds a bacterial sterilizing agent to the chamber. The electrolyte flow past the reference electrode and into the discharge flow from the chamber maintains open electrical communication with the chamber. A deformable body, preferably a bed of finely ground methyl methacrylate grit, in the chamber engages and cleans the glass electrode as the piston reciprocates.

REFERENCES:
patent: 2311976 (1943-02-01), Coleman
patent: 2383450 (1945-08-01), Coleman
patent: 3953136 (1976-04-01), Hach
patent: 4021199 (1977-05-01), Mukae et al.

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