Patent ID: 11940409
Assignee: ENDRESS+HAUSER CONDUCTA GMBH+CO. KG
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 10:
11. An evaluation method of a measuring transducer, comprising:
providing a digital sensor system, comprising:
a digital pH sensor, comprising:
an electronics unit; and
a sensor housing having a first half-cell and a second half-cell,
wherein the first half-cell is a reference half-cell having: an electrolytic junction; a first electrolyte; and a first electrode in contact with the first electrolyte and electrically connected to the electronics unit,
wherein the second half-cell is a measuring half-cell having: a second electrolyte; and a second electrode in contact with the second electrolyte and electrically connected to the electronics unit,
wherein the first half-cell and the second half-cell are adapted to form a potential difference between the first electrode and the second electrode if the digital pH sensor is in contact with a measurement medium,
wherein the electronics unit is programmed with a correction function for converting the potential difference into a digital measured value, wherein the digital measured value is either a voltage value or a pH value,
wherein the first electrolyte and/or a material of the first electrode and/or the second electrolyte and/or a material of the second electrode are selected such that the potential difference between the first electrode and the second electrode, at a pH value of the measurement medium of 7 and a temperature of the measurement medium of 25° C., includes a preset potential difference that is greater than 30 mV or less than −30 mV,
wherein the electronics unit programmed with the correction function is configured to convert the potential difference into the digital measured value and apply the correction function for correcting out the preset potential difference such that, at a pH value of the measurement medium of 7 and at a temperature of the measurement medium of 25° C. and the potential difference of greater than 30 mV or less than −30 mV, the digital measured value is 0 mV if the digital measured value is output as a voltage value or 7 if the digital measured value is output as a pH value, and
wherein the measuring transducer is adapted for receiving and evaluating the digital measured value, and is adapted to be connected to the digital pH sensor;

receiving the digital measured value from the digital pH sensor;
comparing the digital measured value to an upper limit value and a lower limit value; and
outputting an error message if the digital measured value exceeds the upper limit value or falls below the lower limit value.