PH meter calibration method

A calibration method, the No. 1 technology, applied in measuring devices, material analysis by electromagnetic means, instruments, etc., can solve the problems of wasting distilled water, absorbing buffer paper, creating storage conditions, wasting buffer use, etc., to simplify the instrument And cumbersome procedures, guarantee accuracy and precision, and ensure the effect of smooth progress

Active Publication Date: 2014-03-26
SHENZHEN LABPLUS SCI & EDUCATION CULTURE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] like figure 2 and image 3 As shown, a pH meter includes a housing 1 , a control circuit 3 , a calibration switch 4 , an indicating device, a glass electrode 22 , a reference electrode 18 and a reference solution 20 .

[0040] The control circuit 3 is located inside the top of the casing 1 . The calibration switch 4 is located outside the top of the housing 1 . The indicating device comprises a digital display window 2, an indicator light 2-1, and an alarm 2-2. The calibration switch 4 , the indicating device, the glass electrode 22 , and the reference electrode 18 are all electrically connected to the control circuit 3 . The glass electrode 22 is the same as the prior art, and generally consists of a glass strut 21 and a bulb 19 at the lower end of the glass strut 21 .

[0041] There are three liquid pools inside the housing 1 , namely No. 1 liquid pool 5 , No. 2 liquid pool 7 , and No. 3 liquid pool 9 . No. 1 buffer solution 6 is housed in No. 1 liquid pool 5, N...

Embodiment 2

[0052] The difference between this embodiment and the first embodiment is that the No. 3 liquid pool 9 is not installed in the inner shell 1 of the pH meter.

[0053] like Figure 4 As shown, the calibration method of this embodiment is as follows:

[0054] A) Inject No. 1 buffer 6 into No. 1 liquid pool 5, and inject No. 2 buffer 8 into No. 2 liquid pool 7; the operator can set No. 1 buffer 6 and No. 2 buffer 8 through the control circuit 3 Of course, you can also check the remaining days of the shelf life through the digital display window 2;

[0055]B) Hang the pH meter on the test bench, and place a beaker under it, which is used to receive the liquid flowing from the pH meter, and the liquid in the beaker does not contact the glass electrode 22 of the pH meter. Press the calibration switch 4, the control circuit 3 detects whether the buffer solution in the liquid pool is normal: the control circuit 3 receives the signals of the first sensing probe 58 and the second sens...

Embodiment 3

[0060] like Figure 7 and Figure 8 As shown, the difference between the present embodiment and the second embodiment is that a movable beaker 25 is movably connected to the bottom of the housing 1 . The movable beaker 25 is used to hold the liquid that the pH meter sheds during the calibration process, replacing the beaker in the second embodiment.

[0061] Compared with the second embodiment, the calibration method of this embodiment adds the following step C1 between step C and step D: Figure 8 As shown, the control circuit 3 commands the action of the movable beaker 25, and pours the liquid in the movable beaker 25. After pouring, as Figure 7 As shown, the movable beaker 25 resets so that the bulb body 19 of the glass electrode 22 is located in the movable beaker 25 . Step C1 can also be repeated between step C and step E.

[0062] In addition, since the movable beaker 25 can make the bulb body 19 of the glass electrode 22 soak in the liquid in the movable beaker 25,...

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PUM

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/416
Inventor 余翀
Owner SHENZHEN LABPLUS SCI & EDUCATION CULTURE CO LTD
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