Maintenance of dissolved oxygen analyzer

The dissolved oxygen analyzer is a convenient, fast, economical and practical dissolved oxygen analyzer that does not require preheating or waiting, and can be used at any time. It is based on the original battery principle, IP54 waterproof and dustproof, 30 sets of stored data, and a user-friendly menu design that brings more convenience to detection.

The dissolved oxygen analyzer is a convenient, fast, economical and practical dissolved oxygen analyzer that does not require preheating and waiting, and can be used at any time. It is based on the original battery principle, IP54 waterproof and dustproof, 30 sets of stored data, and a user-friendly menu design that brings more convenience to testing. It is a good choice for laboratory or on-site detection of dissolved oxygen content.

Characteristics of dissolved oxygen analyzer:

1) No need to preheat or wait, it can be used anytime.

2) The legs can stand or lie down, the buttons are compact, the leather texture is anti slip, and it can be operated with one hand.

3) The screen display content is rich and practical, and the software menu is intuitive and convenient.

4) No polarization required: When measuring dissolved oxygen, the portable dissolved oxygen meter probe does not require polarization time. Traditional dissolved oxygen analyzer probes usually undergo polarization processes before use.

5) No calibration required: The portable dissolved oxygen meter probe has been calibrated before leaving the factory and can directly measure dissolved oxygen concentration. Traditional dissolved oxygen meters usually have calibration steps when in use, and only after passing the calibration can dissolved oxygen be measured.

6) Low maintenance: The portable dissolved oxygen meter probe is a membraneless probe, which does not require replacement of membrane components or filling of electrolyte, greatly reducing maintenance costs and saving time for users.

7) Strong anti-interference ability: The portable dissolved oxygen meter is a membrane free probe, so it is not affected by the interference of chemical substances in typical wastewater.

8) Durable fluorescent cap: The portable dissolved oxygen analyzer fluorescent cap can maintain its accuracy even when scratched or partially contaminated, and is easy to clean.

Dissolved oxygen analyzer electrode cleaning, calibration, regeneration, maintenance, and upkeep

1) The dissolved oxygen analyzer electrode should be cleaned once every 1-2 weeks. If there are contaminants on the membrane, it can cause measurement errors. Be careful when cleaning and be careful not to damage the diaphragm. Rinse the electrode of the dissolved oxygen analyzer in clean water. If the dirt cannot be washed away, carefully wipe it with a soft cloth or cotton cloth.

2) The zero point and range should be rechecked from February to March.

3) The regeneration of the dissolved oxygen analyzer electrode is carried out approximately once a year. When the measurement range cannot be adjusted, it is necessary to regenerate the dissolved oxygen electrode. Electrode regeneration includes replacing the internal electrolyte, replacing the membrane, and cleaning the silver electrode. If there is oxidation phenomenon observed on the silver electrode, it can be polished with fine sandpaper.

4) If the dissolved oxygen electrode leaks during use, the electrolyte must be replaced.

Calibration: Generally, standard solution calibration or on-site sampling calibration can be used.

1) Standard solution calibration method: Standard solution calibration generally uses two-point calibration, namely zero point calibration and range calibration. The zero point calibration solution can be a 2% Na2SO3 solution. The range calibration solution can be selected as a 4M KCl solution (2mg/L) based on the measurement range of the instrument; 50% methanol solution (21.9mg/L).

2) On site sampling calibration method (Winkler method): In practical use, the Winkler method is often used to calibrate dissolved oxygen analyzers (dissolved oxygen meters) on site. There are two situations when using this method: when sampling, the instrument reading is M1, the analytical value is A, and when calibrating the instrument, the instrument reading is still M1. In this case, only the instrument reading needs to be adjusted to be equal to A; When sampling, the instrument reading is M1, and the laboratory analysis value is A. When calibrating the instrument, the instrument reading changes to M2. At this time, the instrument reading cannot be adjusted to be equal to A, but should be adjusted to 1MA × M2.

3) Dissolved oxygen electrode regeneration: The signal impedance of the dissolved oxygen electrode is relatively high (about 20M Ω), and the distance between the dissolved oxygen electrode and the converter is about 50m. The dissolved oxygen electrode should also be in working condition when not in use and can be connected to the dissolved oxygen converter. Electrodes that have been stored for a long time or regenerated (by replacing the electrolyte or membrane) should be polarized in an anaerobic environment for 1-2 hours before use. Due to the significant impact of temperature changes on the diffusion and oxygen solubility of the electrode membrane, calibration requires a longer time (about 10 minutes) to achieve equilibrium of the temperature compensation resistance; The oxygen partial pressure is related to the altitude of the area, and the instrument must be compensated according to the local atmospheric pressure before use; When measuring the salt content of a solution, a solution with an equivalent salt content should be used for instrument calibration; For the flow measurement method, a small flow velocity of 0.3m/s is required to flow through the electrode.