PH electrode is a commonly used sensor for water quality analyzers, and PH electrode is also one of the parts that simply have problems in daily testing. We have told us before that we must pay special attention to it whether it is used, stored, and cleaned. But as a commonly used wearable part, the correct maintenance method can only extend the service time of the PH electrode. In order to ensure the accuracy of the water quality analyzer, the PH electrode must be replaced in the end. We must pay attention to the following factors when buying PH electrodes.

The raw material of the electrode

We all know that the raw materials of the PH electrode can be divided into two types. One is the PH electrode of glass raw material. The PH electrode of glass raw material has a wide temperature measurement scale and can detect corrosive materials and solvents. It is relatively simple to crack, and special attention should be paid when cleaning. The other is the PH electrode made of plastic materials. The big advantage of this PH electrode is that it is easy to clean and has strong durability. However, it is weaker than glass raw materials in terms of applicable scale.

The structure of the electrode

Common PH electrodes can be divided into two structures: liquid electrolyte, gel, and polymer. The PH electrode with liquid electrolyte structure is commonly used in water quality analyzers. The PH electrode with a liquid electrolyte structure can be used to make up or replace it. For example, when the electrolyte is found to be contaminated, it can be dealt with by replacing the electrolyte. Therefore, the PH electrode of the liquid electrolyte structure has a longer service life, but it is under measurement. The gel-structured PH electrode uses gel or polymer. The protection of the PH electrode of this material is relatively simple, and will not be interfered with by external ions, and will not be affected by changes in external pressure.

The primary detection target of the electrode

General specification PH electrode can use various test items, but it is not applied to all test samples. We all know that the water quality analyzer is mainly for analyzing and testing water bodies, but it can also detect data from a variety of solutions. And some solutions will form errors when using standard PH electrodes to detect. Common ones are some semi-solids, solids, or solids suspended in solution samples. When testing the pH value of these solutions, testers generally choose a special-style PH electrode, such as a conical-sensing PH electrode.

Multi-parameter water quality analyzer mainly adopts ion-selective electrode measurement method to achieve accurate detection. Electrodes on the instrument: PH, fluorine, sodium, potassium, calcium, magnesium, and reference electrode. Each electrode has an ion-selective membrane that will react with the corresponding icons in the sample to be tested. The membrane is an ion exchanger, which reacts with the ion charge to change the membrane potential, and the potential between the liquid, sample and membrane can be measured.

The two potential differences detected on both sides of the membrane will generate current. The sample, reference electrode, and reference electrode solution constitute one side of the loop, the membrane, the internal electrode solution, and the internal electrode on the other side.

Product features of multi-parameter water quality analyzer:

1. Small size, easy to carry, suitable for on-site pond inspection. LCD digital display, easy to use.

2. Using the photoelectric colorimetric principle of spectrophotometry, it is convenient to apply reagents, such as ammonia nitrogen detection, and the detection result is displayed digitally in 2 minutes.

3. 400-2000 sets of test data can be stored for easy viewing at any time, the test results are stable and reliable and conform to national standards.

4. The host has a built-in large-capacity lithium battery, which is suitable for quantitative measurement in the laboratory or in the field. It can be used for one week after charging for 8 hours.

5. The calibration curve within the full range is stored in the instrument, with automatic shutdown function and power failure protection function, so that data will not be lost.

6. With 8 parameters, aquaculture water quality indicators are basically covered, including (determination of ammonia nitrogen, rapid analysis of nitrite, determination of dissolved oxygen, determination of sulfide, determination of residual chlorine, determination of copper, phosphoric acid Salt determination), water quality analysis results are stable and reliable.

7. Self-set alarm range, over-range buzzer alarm, and display alarm function.

8. The Bluetooth version can upload data to the mobile phone in real-time. You can also check the water quality data anytime and anywhere when you are out of the field.

Before using the multi-parameter water quality analyzer, please pay attention to the following items:

1. The host should be warmed up for 15-20 minutes before the experiment.

2. The COD test tube used in the experiment does not need to be rinsed with detergent. Generally, it is rinsed with tap water and then dried with distilled water to prevent the detergent from adhering to the inner wall and affecting the measurement result.

3. For continuous measurement of multiple samples, pour out the solution in the tested cuvette from one corner, wash it with distilled water and carefully shake it off, and then pour the new solution to be tested, which introduces errors Within the allowable range, in order to make the error smaller, the COD value of the water sample can be increased from small to large when measuring.

4. When pouring the solution from the cuvette, do not splash the solution on the light-transmitting viewing window of the cuvette. Before the colorimetric determination, check whether the cuvette is clean. In addition to visual inspection, you can check every The optical density A of two cuvettes, test whether the relative value is consistent

5. When pulling the rod of the tester, ensure that the cuvette under test is accurately aligned with the light path.

6. After the reaction liquid is poured into the cuvette, there are small bubbles floating up, which will affect the fluctuation of the digital display. Read the reading when the number is stable.

If the water sample in the test tube splashes during digestion, please check:

1. Whether the prepared reagent has been placed in the air for too long;

2. After adding the reagent to the water sample, whether it is shaken well;

3. Whether it is analytically pure concentrated sulfuric acid or sulfuric acid is out of date.

4. Whether the temperature of the digestion apparatus is too high.

How to get better stability of nitrate analyzer The nitrate analyzer adopts a new generation of sensor and membrane head with more stable performance, ion-selective electrode method, the sensor consists of nitrate ion-selective electrode, chloride ion-selective electrode and temperature electrode Together to form a measurement system, several parameters can be modified with each other to reduce interference. The monitor can be flexibly calibrated online to further improve the accuracy of the measurement. The sensor uses an ion-selective electrode to detect nitrate ions (NO3-) in the process of water. For better stability, a PhD reference system was used. Nitrate measurements were compensated using a chloride ion-selective electrode. Not only does the technology pre-calibrate each electrode individually, it also allows for inter-calibration between the three electrodes. The sensor also contains temperature compensation.

Measuring principle

The ultraviolet light emitted from the pulsating light source illuminates the colorimetric cell, NO in the sample solution flowing in the colorimetric cell absorbs part of the ultraviolet light, and the transmitted light intensity is detected by two ultraviolet photodiodes with different detection wavelengths. After each signal is processed inside the instrument and compared with the corrected value, the instrument calculates the NO concentration value. Using a variety of beam testing methods, plus a special correction function, it can compensate for the chromaticity of the sample and the optical lens. Therefore, the analysis module has good stability and accuracy.

The nitrate analyzer is calibrated according to the calibration time and calibration typeset by the user. The obtained result will be compared with the calibration result stored in the original analyzer. If it is less than the error limit set by the user, the original value will be accepted and replaced. If the calibration parameter is larger than the limit set by the user, the original calibration parameter will not be replaced and an alarm signal will be output. According to the requirements of industrial and environmental online, the electrical part and the hydraulic pipeline are completely isolated. This simple and stable LFA system structure ensures the high stability of the analyzer in electrical and hydraulic aspects and ensures that the analyzer can run stably for a long time.

The BOQU ammonia nitrogen online analyzer can use the electrode method and the colorimetric method. The electrode method is to measure the electromotive force change through the ammonia gas sensitive electrode, which has a certain linear relationship with the logarithm of the ammonia nitrogen concentration in the water sample. The value determines the content of ammonia nitrogen in the sample. The instrument complies with the industry standard 'Technical Requirements for Ammonia Nitrogen Water Quality Automatic Analyzer' (HJ/T101-2003), and has obtained the China Environmental Protection Product Certification (CCEP) certificate. Instrument features: Patented intelligent dilution, automatic range switching, low reagent consumption standard sample verification (quality control sample verification) Modular design, convenient operation, simple maintenance Built-in automatic cleaning system Ultra-high-precision syringe pump, the minimum quantitative volume is 0.83 μL, ensuring that the sample Accurate quantification of reagents with instrument operation basic parameter storage, power-off protection and automatic recovery functions Application fields: industrial wastewater, municipal sewage, rivers and lakes, surface water, groundwater, drinking water and sea water and other fields.
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