PH meter calibration method

Abstract

The invention relates to a PH meter and a calibration method thereof. The PH meter includes a casing, a control circuit, a calibration switch, an indication device, a glass electrode, a reference electrode and a reference solution, wherein at least two liquid tanks are arranged in the casing and filled with buffer solution; liquid outlets are formed at the bottoms of the liquid tanks; air inlets are formed at the tops of the liquid tanks; each liquid outlet is communicated with the glass electrode through a liquid guiding tube; and liquid outlet valves are installed at the liquid outlets or in the liquid guiding pipes; air inlet valves are installed at the air inlets; and the liquid outlet valves and the air inlet valves are electrically connected with the control circuit. The invention has the advantages that the integration degree is high, the operation is convenient, the measuring data is accurate, and the calibration measurement is integrated.

Description

technical field [0001] The invention relates to the technology of a potentiometric acidity meter, in particular to a pH meter and a calibration method thereof. Background technique [0002] Acidity meter (referred to as PH meter) is a commonly used instrument and equipment, mainly used to precisely measure the pH value of the liquid medium, coupled with the corresponding ion selective electrode can measure the mV value of the ion electrode potential, widely used in industry, agriculture, scientific research , environmental protection and other fields. At present, various types and specifications of pH meters are widely used in industrial fields and laboratories. The basic principle is the potentiometric method. Most of the indicating electrodes are glass electrodes. The chemical amount of H+ ions is converted into a measurable electrical signal value, so the pH electrode is defined as an electrochemical sensor sensitive to H+ ions. [0003] The current pH meter generally c...

AI Technical Summary

Problems solved by technology

However, the pH meters currently used all use built-in glass electrodes to calibrate the instrument and measure the solution, and the calibration often cannot be successful once, so it needs to go through repeated washing and positioning calibration, and a lot of distilled water and buffer will be wasted in the process. ,Absorbent paper

The preparation and preservation of the buffer solution requires harsh conditions. Its preservation has a time limit, and it will expire after a certain period of time and cannot be used again. In addition, the amount of buffer solution used for the calibration of the pH meter cannot be predicted in the early stage. The above calibration process will inevitably result in a large amount of buffer solution. Use and waste, if it is too small, it will not be able to meet the calibration dosage, if it is too much, it will lead to the need to create storage conditions and consider the issue of expiration

Furthermore, especially during the entire operation process, there must be an operator present, and a hand-held pH meter is used for full calibration, which wastes a lot of precious time. Even so, thirdly, because the calibration process basically depends on the operator's observation to judge the calibration time And collect relevant data, in many cases still can not achieve accurate and satisfactory correction effect

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