pHJi, mainly used for precise measurement of the pH value of liquid media, is widely used in fields such as environmental protection, sewage treatment, scientific research, pharmaceuticals, fermentation, chemical industry, and tap water. This instrument is also used by food factories and drinking water plantsQS、HACCPEssential inspection equipment in certification. High popularity, easy to learn, and simple to operate.

Environmental product certification is one of the voluntary product certification services carried out by the China Quality Certification Center, aimed at enhancing the quality of products'China Environmental Protection Product Certification'The way of marking indicates that the product meets the requirements of relevant environmental certification, and the certification scope covers pollution prevention and control equipment, furniture, building materials, light industry and other environmentally beneficial products. Intended to promote the production and use of environmentally friendly products through environmental certification, advance the improvement of living and natural environments, and strive to achieve a virtuous cycle of the natural environment and sustainable socio-economic development.Environmental certification PH meter PC-3110The controller has applied for an environmental certification certificate, and the product meets the requirementsPHTechnical requirements for automatic water quality analyzer. Suitable for various environmental protection fields.

certificatesPHcountPC-3110characteristic:

certificatesPHcountPC-3110Technical parameters:

PHMaintenance of electrodes

1.PHcount/When the acidity meter is not used in the short term, it can be fully soaked in distilled water or1×10-4In hydrochloric acid solution. But if it is not used for a long time, it should be dried and not soaked in detergent or other absorbent reagents.

2.Before use, checkPHcount/The bulb at the front end of the glass electrode of the acidity meter. Under normal circumstances, the electrode should be transparent and free of cracks; The bubble should be filled with solution and there should be no bubbles present.

3.When measuring solutions with high concentrations, try to shorten the measurement time as much as possible, clean carefully after use, and prevent the measured liquid from adhering toPHcount/The electrode of the acidity meter is contaminated.

4.cleanPHcount/After the electrode of the acidity meter, do not wipe the glass film with filter paper, but use filter paper to absorb dry,Avoid damaging the glass film, preventing cross contamination, and affecting measurement accuracy.

5.Attention during measurementPHcount/The silver silver chloride internal reference electrode of the acidity meter electrode should be immersed in the chloride buffer solution inside the bulb to avoid the phenomenon of digital jumping in the display part. When using, be careful to gently shake the electrode a few times.

6.PHcount/Acidimeter electrodes cannot be used for strong acids, strong bases, or other corrosive solutions.

7.It is strictly prohibited to use in dehydrated media such as anhydrous ethanol, potassium dichromate, etc.

PHPossible causes of digital instability phenomenon

1.Check if the electrodes are damaged;

2.It should be because the electrode has been used for too long. First, calibrate it to see if it is effective;

3.Can try it out2.5MMOL/LofKCLSolution immersion probe;

4.Clean the glass ball, is it possible that some organic matter has adhered to it over time, causing the reaction to be insensitive;

5.There exists a chemical equilibrium in water~CO2 + H2O→H+ + HCO3-Due to the weak alkalinity of general pure water or surface water, the equilibrium shifts towards the positive reaction directionPHIt will continue to rise~I personally think so;

6.Add neutral salts (such asKcl）As an ion strength regulator, it changes the total ion strength in the solution, increases conductivity, and enables rapid and stable measurement. This method is a national standardGB/T6P04.3—93According to the regulations:'In order to reduce the influence of liquid contact potential and achieve stability quickly when measuring water samples50mlAdd a neutral drop to the water sample0.1moL/LKCLSolution.'Although this method changes the ion strength in the water sample, it has to some extent causedPHIt is worth changing, but experimental evidence has shown that this change only changes numerically0.01PHLeft and right are completely acceptable. But when using this method, it is important to pay attention to the addedKclThe solution should not contain any alkaline or acidic impurities. Therefore,KclThe reagents should be of high purity, and the water quality of the prepared solution should also be of high purity neutral water quality;