How to properly install the maintenance water quality online analyzer?

(1) Installation and maintenance of pH meter

The pH meter is installed in both flow-through and immersion versions. The sewage treatment plant generally chooses immersion installation. For example, the pH meter of the sewage treatment plant is installed in the outlet overflow tank of the oxidation ditch. The pH value here is representative and the water flow is stable, which will not cause the pH meter. Big impact. Regular maintenance helps to accurately measure the meter and extend the life of the meter. It should be noted that the dedicated cable between the sensor and the transmitter should not be wet, otherwise the high impedance low voltage signal of the electrode will not be transmitted to the transmitter. If the electrode is not measured, the yellow protective sleeve should be put on, which can make the electrode wet, which is beneficial to prolong the service life of the electrode. Every other month or so, the electrode should be cleaned. Spray the attached material with a gentle water flow, then immerse the electrode in the cleaning solution for a while, then rinse it with water. The sensor bracket should also be cleaned. After each cleaning, the buffer solution should be used for calibration. At the current domestic pH calibration solution, pH=4 is OK, and pH=7 is not accurate enough, which will affect the calibration result. Therefore, it is best to use the manufacturer's calibration solution. The manufacturer generally provides two standard solutions. One bottle has a pH equal to 7 and is used to calibrate the zero point of the meter. A bottle with a pH equal to 4 is used to calibrate the signal output slope of the meter.

(2) Installation and maintenance of dissolved oxygen meter

The dissolved oxygen meter is generally immersed, and it should be noted that the original mounting bracket must be used. The mounting brackets supplied by the manufacturer are made of stainless steel with plastic chains. The length of the chain can be adjusted to change the immersion depth of the sensor. The guide tube on the bracket ensures that the sensor is always in the vertical position. The bracket portion is specially designed to transmit fluctuations in the water surface to the dip tube, causing slight vibration of the dip tube, resulting in an additional cleaning effect on the probe surface through the dip tube. In order to reduce investment, some users make their own mounting brackets, which often leads to poor sealing between the dip tube and the sensor on the bracket. The sewage infiltrates, so that the joint between the special cable and the sensor is immersed in the sewage for a long time, which is easy to cause damage to the sensor; Some even do not install the bracket, directly put the sensor into the water, so that a large pulling force will be formed between the sensor and the cable, and the sensor is more likely to be damaged. The dissolved oxygen probe is gently cleaned with water every week. It is found that the damage of the membrane head should be replaced in time, and the electrolyte should be replaced in time. When the sewage contains H2S, NH3, benzene or phenol, it is harmful to the membrane head. In this case, the film head must be replaced frequently. To judge whether the electrode in the probe is good or bad, just look at the color. The reference electrode should be black gray, the cathode (gold electrode) should be yellow, and the counter electrode must be bright, otherwise it should be cleaned or regenerated. V. Conclusion With the increasing emphasis on water resources protection in China, the purification treatment of sewage is becoming more and more important, and the instrumentation required for the matching process is indispensable. As the most important instrument in the wastewater treatment industry, water quality analyzers are also important for regular maintenance and calibration, in addition to proper selection and installation, and are the key to making the instrument work.