Automatic portable pH meter and method with calibration receptacle
First Claim
1. A portable pH meter comprising,an electrode probe comprising a pH electrode and a reference electrode for measuring hydrogen ion electrochemical potential of a liquid,means for measuring the temperature at the reference and pH electrodes,a calibration receptacle adapted to receive the electrode probe, and for containing pH buffer calibration solution of predetermined pH,probe detecting means for determining the positioning of said electrode probe in said calibration receptacle,calibration means activated by said probe detecting means, for calibrating the electrochemical potential measured by said probe while positioned in said calibration receptacle to a predetermined pH value corresponding to said predetermined calibration buffer pH, andtemperature compensation means for compensating the electrochemical potential measured by said probe in respect of the temperature measured by said temperature measurement means.
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Abstract
A portable self-calibrating pH meter particularly adapted for use by unskilled operators in adverse environment conditions is disclosed which has a minimum of operator controls while preventing operator errors and while providing effective and accurate pH measurement.
47 Citations
8 Claims
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1. A portable pH meter comprising,
an electrode probe comprising a pH electrode and a reference electrode for measuring hydrogen ion electrochemical potential of a liquid, means for measuring the temperature at the reference and pH electrodes, a calibration receptacle adapted to receive the electrode probe, and for containing pH buffer calibration solution of predetermined pH, probe detecting means for determining the positioning of said electrode probe in said calibration receptacle, calibration means activated by said probe detecting means, for calibrating the electrochemical potential measured by said probe while positioned in said calibration receptacle to a predetermined pH value corresponding to said predetermined calibration buffer pH, and temperature compensation means for compensating the electrochemical potential measured by said probe in respect of the temperature measured by said temperature measurement means.
Specification