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Adaptive ion meter and its method for measuring ion concentration

An ion concentration and ion meter technology, applied in the field of electrochemistry, can solve the problems affecting the accuracy and deterioration of the test, and achieve the effects of ensuring accuracy, improving accuracy and reducing costs.

Active Publication Date: 2016-04-13
江苏苏威尔科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The ion meter is an instrument used to measure the concentration of ions in the solution. It is based on the electrochemical reaction of the ion-selective electrode. However, the electromotive force of the ion-selective electrode has a certain correlation coefficient with the temperature. At the same time, the ion-selective electrode Due to the reasons of manufacture or use, it will cause deterioration with the prolongation of use time, thus affecting the accuracy of the test. How to develop an easy-to-use and accurate ion meter has long been a problem that has plagued engineers and technicians.

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  • Adaptive ion meter and its method for measuring ion concentration
  • Adaptive ion meter and its method for measuring ion concentration
  • Adaptive ion meter and its method for measuring ion concentration

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Embodiment 1

[0045] The self-adaptive ion meter that this embodiment provides, its structure schematic diagram is as follows figure 1 As shown, it includes a data processor, an ion measuring probe, an A / D conversion circuit electrically connected to the input port of the data processor, and a temperature detection circuit. The structure of the ion meter will be described in detail below.

[0046] (1) A / D conversion circuit

[0047] Since the value of the electromotive force ranges from 0mv to 1000mv, in order to improve the accuracy, the A / D conversion circuit uses a 24-bit Σ-Δ AD converter, and its measurement accuracy is one millionth at 20 bits. Since the ion electrode is a slow-response device, its output electromotive force cannot be mutated, and the general response time of the ion electrode is 30 seconds to 2 minutes, so in this embodiment, a slow 24-bit Σ-Δ type is selected. AD converter HX530, and set its output rate to 10HZ, this rate can ensure that the obtained data can meet t...

Embodiment 2

[0080] The structure of the adaptive ion meter provided in this embodiment is basically the same as that of the adaptive ion meter provided in Embodiment 1, the difference is: the gain of the 24-bit Σ-Δ type AD converter in the A / D conversion circuit Set it to 8 times, which is applied to the scene with relatively small electromotive force. The operational amplifier chip of the impedance matching circuit adopts TLV271BCD, and its VIOMAX is only 2mv, which is suitable for more accurate measurement.

[0081] The method for measuring the ion concentration by the self-adaptive ion meter of the present embodiment is basically the same as that in Embodiment 1, the difference is:

[0082] (1) Calibrate the Nernst equation coefficient S at different temperatures in step (2) 实际 (Tx) method is: measuring temperature is T 1 S at the time 实际 (T1) then pass Calculated to get S 实际 (Tx).

[0083] (2) The method of measuring the actual temperature Tx in step (1) and step (3) is: insert...

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Abstract

The invention discloses an adaptive ion meter, including a data processor, an ion measure probe, as well as an A / D conversion circuit electrically connected to the input terminal of the data processor and a temperature detection circuit; the A / D conversion circuit adopts a 24 bit sigma-delta type AD converter; the input terminal of the A / D conversion circuit employs a BNC interface; the BNC interface is in matching connection to the BNC interface of the ion measure probe; the temperature detection circuit comprises a digital temperature sensor detection circuit for measuring the environment temperature and a thermistor detection circuit for measuring the temperature of a solution. The invention has the advantages of simpleness, easiness for usage, strong adaptability and high measurement precision.

Description

technical field [0001] The invention relates to an ion meter and a method for measuring ion concentration thereof, more specifically, an adaptive ion meter and a method for measuring ion concentration thereof, belonging to the technical field of electrochemistry. Background technique [0002] At present, the teaching and experiment of analytical chemistry and chemical engineering, energy, and environmental protection are widely used in the trace analysis of ions, and the ion meter composed of ion selective electrodes (ISE) is used to measure the concentration of ions, which is our common method. The ion meter is an instrument used to measure the concentration of ions in the solution. It is based on the electrochemical reaction of the ion-selective electrode. However, the electromotive force of the ion-selective electrode has a certain correlation coefficient with the temperature. At the same time, the ion-selective electrode Due to the reasons of manufacture or use, it will ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/26G01N27/416
Inventor 赵勇王知非
Owner 江苏苏威尔科技有限公司