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Last modified by kai on 2025/08/06 10:05
From version 131.1
edited by Karry Zhuang
on 2024/07/15 18:21
Change comment: There is no comment for this version
To version 132.1
edited by Karry Zhuang
on 2024/07/16 10:25
Change comment: There is no comment for this version

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722 722  
723 723  
724 724  
725 -= 6. Water qualit Sensors =
725 += 6. Water Qualit Sensors =
726 726  
727 727  == 6.1  PH Sensor ==
728 728  
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759 759   [[image:image-20240715181651-3.png||height="223" width="562"]]
760 760  
761 761  
762 -=== 6.1.5 Installation Notice ===
762 +=== 6.1.4 Installation Notice ===
763 763  
764 764  
765 765  (((
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794 794  [[image:image-20240715182122-6.png]]
795 795  
796 796  
797 -== 6.2 Wind Speed/Direction ~-~- WSS-02 ==
797 +(% style="color:#4472c4" %)**Sampling:**
798 798  
799 +Take representative water samples according to sampling requirements. If it is inconvenient to take samples, you can also put the electrode into the solution to be tested and read the output data. After a period of time, take out the electrode and clean it.
799 799  
801 +
802 +(% style="color:#4472c4" %)**Measure the pH of the water sample:**
803 +
804 +First rinse the electrode with distilled water, then rinse it with the water sample, then immerse the electrode in the sample, carefully shake the test cup or stir it to accelerate the electrode balance, let it stand, and record the pH value when the reading is stable.
805 +
806 +
807 +=== 6.1.5 Maintenance ===
808 +
809 +
810 +* The equipment itself generally does not require daily maintenance. When an obvious fault occurs, please do not open it and repair it yourself. Contact us as soon as possible!
811 +* There is an appropriate amount of soaking solution in the protective bottle at the front end of the electrode. The electrode head is soaked in it to keep the glass bulb and the liquid junction activated. When measuring, loosen the bottle cap, pull out the electrode, and rinse it with pure water before use.
812 +* Preparation of electrode soaking solution: Take a packet of PH4.00 buffer, dissolve it in 250 ml of pure water, and soak it in 3M potassium chloride solution. The preparation is as follows: Take 25 grams of analytical pure potassium chloride and dissolve it in 100 ml of pure water.
813 +* The glass bulb at the front end of the electrode cannot come into contact with hard objects. Any damage and scratches will make the electrode ineffective.
814 +* Before measurement, the bubbles in the electrode glass bulb should be shaken off, otherwise it will affect the measurement. When measuring, the electrode should be stirred in the measured solution and then placed still to accelerate the response.
815 +* The electrode should be cleaned with deionized water before and after measurement to ensure accuracy.
816 +* After long-term use, the pH electrode will become passivated, which is characterized by a decrease in sensitivity gradient, slow response, and inaccurate readings. At this time, the bulb at the bottom of the electrode can be soaked in 0.1M dilute hydrochloric acid for 24 hours (0.1M dilute hydrochloric acid preparation: 9 ml of hydrochloric acid is diluted to 1000 ml with distilled water), and then soaked in 3.3M potassium chloride solution for 24 hours. If the pH electrode is seriously passivated and soaking in 0.1M hydrochloric acid has no effect, the pH electrode bulb can be soaked in 4% HF (hydrofluoric acid) for 3-5 seconds, washed with pure water, and then soaked in 3.3M potassium chloride solution for 24 hours to restore its performance.
817 +* Glass bulb contamination or liquid junction blockage can also cause electrode passivation. At this time, it should be cleaned with an appropriate solution according to the nature of the contaminant.
818 +* (((
819 +The equipment should be calibrated before each use. For long-term use, it is recommended to calibrate once every 3 months. The calibration frequency should be adjusted appropriately according to different application conditions (degree of dirt in the application, deposition of chemical substances, etc.). After aging, the electrodes should be replaced in time.
820 +)))
821 +
822 +
823 +=== 6.1.6 Calibration ===
824 +
825 +
826 +This device uses three-point calibration, and three known PH standard solutions need to be prepared.
827 +
828 +(% style="color:#4472c4" %)**The steps are as follows:**
829 +
830 +(1) Wash the electrode in distilled water, and put it in 9.18 standard buffer solution. After the data stabilizes, enter the following calibration command, that is, 9.18 calibration is completed. (% style="color:#4472c4" %)**"AT+CALPH=9" downlink:0xFB 09**(%%)
831 +
832 +
833 +(2) Wash the electrode in distilled water, and put it in 6.86 standard buffer solution. After the data stabilizes, enter the following calibration command, that is, 6.86 calibration is completed; (% style="color:#4472c4" %)**"AT+CALPH=6" downlink:0xFB 06**(%%)
834 +
835 +
836 +(3) Wash the electrode in distilled water, and put it in 4.01 standard buffer solution. After the data stabilizes, enter the following calibration command, that is, 4.00 calibration is completed. (% style="color:#4472c4" %)**"AT+CALPH=4" downlink:0xFB 04**(%%)
837 +
838 +
839 +
840 +
841 +== 6.2 EC Sensor ==
842 +
843 +
800 800  [[image:1656055444035-179.png]]
801 801  
802 802