| 摘要 |
A system for measuring the pOH value of a solution by subtracting a signal representing the pH value of the solution from a signal representing the value of the logarithm of the reciprocal of the ionization constant of water at the solution temperature. The circuit for providing the value of the logarithm utilizes a temperature sensitive resistive element having a positive temperature coefficient. That element is shunted by a fixed resistor and the shunt combination is in series with another fixed resistor and a source of fixed potential so that the current through the circuit is proportional to the value of the logarithm.
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