METHOD OF DETERMINING FLUID pH AND DEVICE TO THIS END Russian patent published in 2015 - IPC G01N27/30 G01N27/333 G01N27/74 

FIELD: instrumentation.

SUBSTANCE: comparison electrode and two ion-selective measuring electrodes with equal parameters of thermal inertia and different parameters of their isopotential points are used, i.e. E_i1, pH_i1 and E_i2, pH_i2, are used. Said electrodes are placed in fluid to register potentials E₁ and E₂ at outputs of the first and second measuring electrodes to calculate fluid pH by the formula where This device comprises comparison electrode and two ion-selective measuring electrodes with equal parameters of thermal inertia and different parameters of their isopotential points. It includes also two secondary transducers ST-1 and ST-2, aforesaid electrodes being connected to their inputs. Outputs of ST-1 and ST-2 are connected to inputs of said first and second converters of voltage to digit. Outputs of said converters are connected to microprocessor. Output of the latter makes the output of this device.

EFFECT: ruled out influence of fluid temperature on the results of measurements to up pH determination accuracy.

2 cl, 1 dwg