1. Work environment 1. Ambient temperature 5-40 degrees 2. Relative humidity of the environment: 85% 2. Use, maintenance and precautions 1. Remove the electrode protective cover before testing (the solution in the cover is 3MKCL, if crystals ooze, it is normal phenomenon and will not affect the use of the electrode) 2. Observe if the inside of the sensitive bulb is completely filled with liquid. If bubbles are found, gently shake the electrode (like a thermometer) to remove the bubbles in the sensitive bulb, otherwise it will affect the accuracy of the test. Electrode and pH meter calibration and testing 1.Connect the PH electrode to the input terminal of the PH instrument and the connection is correct. 2. Perform the calibration according to the instrument's instruction manual and the calibration result should be measured. Third, the storage and maintenance of the liquid-filled pH composite electrode 1. The electrode uses an electrical space. Please clean the electrode with distilled water and put it in a protective bottle. It will be activated by injecting the solution before the next test. 2.If the electrode is not used for a long time, it should be rinsed and the remaining distilled water should be absorbed. 3. The sensitive glass bulb on the front of the electrode should not be in contact with hard objects, any damage and scratching will render the electrode invalid. 4. After long-term use of the electrode, the slope and response speed of the electrode may decrease.The measuring end of the electrode can be immersed in 4% HF for 3-5 seconds or in a solution HCL diluted for 1-2 minutes, then cleaned with distilled water in chlorine Soak in potassium solution (4M) to rejuvenate 5. If there is a substance in the tested container which is easy to contaminate the sensitive bubble or block the liquid junction to passivate the electrode, the response speed will be considerably slower, the slope will be reduced, or the reading will be unstable, so you must choose according to the nature of the pollutant.Clean with an appropriate solution to renew it. describe: Heating voltage: 5 0.2 V (AC / DC) Working current: 5-10mA Detectable concentration range: PH0-14 Detection temperature range: 0-80 Response time: 5S Settling time: 60S Component power: 0.5 W Operating temperature: -10 & nbsp; 50 & nbsp; (nominal temperature 20) Humidity: 95% relative humidity (nominal humidity 65% relative humidity) Module size: 42mm 32mm 20mm Output: analog voltage signal output With 4 M3 mounting holes