Imported dissolved oxygen test box

Imported dissolved oxygen test boxColorimetric testing kit

Colorimetric testing kit

Imported dissolved oxygen test boxmethod

Aquatic plants produce oxygen, but organic microorganisms usually consume oxygen when feeding on pollutants, so the dissolved oxygen content in natural water is a direct reflection of water quality. The solubility of oxygen is enhanced at low temperatures; The saturation of oxygen in summer should be reduced to 4ppm. Dissolved oxygen is an essential substance for fish and aquatic organisms to sustain life, and helps with the natural degradation of organic matter. When using aerobic digestion in sewage treatment plants, it is also necessary to ensure that the dissolved oxygen content is not less than 2ppm.

As the temperature increases, the corrosiveness of oxygen to metals increases, which can cause uneven surfaces on systems containing iron, such as high-pressure boilers and deep well oil recovery equipment. In order to prevent economic losses caused by corrosion, it is necessary to handle liquids in contact with metal surfaces, and physical and chemical methods are usually used together. The degassing method can reduce the concentration of oxygen in the boiler inlet water from a high ppm level to several ppb levels. Chemical reducing agents, such as hydrazine DEHA、 Sodium sulfite and other substances can be used as substitutes or in conjunction with degassing methods.

Imported dissolved oxygen test boxThe maintenance work

Daily cleaning and maintenance

Regular cleaning: It is recommended to clean the dissolved oxygen test box externally once a week. Use a soft cloth or sponge dipped in a mild detergent diluent to gently wipe the surface of the test box to remove stains and residues. Be careful to avoid using cleaning agents containing strong acids, alkalis, or corrosives to prevent damage to the material of the test box. At the same time, it is also necessary to ensure that the fabric or sponge is clean and free of oil stains to prevent secondary pollution.

Sensor protection: If the test box is equipped with sensors, especially optical sensors (such as fluorescence based sensors), extra caution is required. Check the sensor window monthly for clarity, transparency, and absence of scratches or dirt. If slight stains are found, they can be gently wiped with specialized lens paper or a soft cotton swab. For stubborn stains, it is recommended to contact the manufacturer or professionals for treatment. Do not use hard objects to scratch on your own to avoid damaging the sensor surface.

Waterproof and moisture-proof: As a precision instrument, the dissolved oxygen test box is sensitive to environmental humidity and moisture. During daily storage and use, it should be kept in a dry environment, away from water sources and humid areas. If accidentally touched with water, immediately use a dry soft cloth to gently absorb the moisture and place it in a well ventilated place to air dry naturally, avoiding direct sunlight and high temperature baking.

Dustproof treatment: When not in use, it is recommended to store the dissolved oxygen test box in a dust-proof bag or a dedicated protective box to reduce dust accumulation. Regularly (such as monthly) open and inspect to ensure that there is no accumulation of dust inside, especially in the sensor and circuit parts. If dust is found, it can be gently removed using the low suction mode of a small vacuum cleaner or a soft bristled brush.

Battery maintenance: If the test box relies on battery power, the battery level should be checked regularly to ensure sufficient power. Develop a reasonable replacement cycle based on usage frequency and battery type. Generally speaking, alkaline batteries can be replaced once a year, while rechargeable batteries need to be replaced based on the number of charge and discharge cycles and battery status. When replacing the battery, pay attention to following the instructions in the manual to avoid reversing the positive and negative poles.

Calibration and Accuracy Verification

Regular calibration: To ensure the accuracy of measurement results, it is recommended to calibrate the dissolved oxygen test kit once every quarter or six months (depending on the frequency of use and manufacturer's recommendations). Calibration usually includes two steps: zero calibration and range calibration. Zero calibration can be performed in an anaerobic environment (such as adding sodium sulfite solution), while range calibration criteria require the use of standard oxygen solution or samples of known concentration. During the calibration process, it is necessary to strictly follow the calibration procedures provided by the manufacturer and record the calibration data for subsequent tracking.

Accuracy verification: In addition to regular calibration, accuracy verification should also be conducted irregularly. This can be achieved by comparing measurement results with laboratory standard methods or using third-party calibration services. Accuracy verification helps to timely detect potential measurement deviations and potential faults, thereby ensuring the reliability and accuracy of the test box.

The use and storage of standard solutions: Standard solutions are required for calibration and accuracy verification. These solutions should be prepared and stored according to the methods provided by the manufacturer to ensure accurate and stable concentration. When preparing standard solutions, attention should be paid to using high-purity chemicals and distilled or deionized water to avoid introducing impurities. The prepared standard solution should be stored in a cool, dark place and used up within its expiration date.