Changes for page Water Quality Sensors

Last modified by Karry Zhuang on 2025/02/18 15:43

From version < 17.1 >

edited by Karry Zhuang
on 2024/07/18 18:58

To version < 26.1 >

edited by Karry Zhuang
on 2024/07/18 19:14

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@@ -37,45 +37,48 @@
  == 1.5 Installation ==
-- Do not power on while connect the cables. Double check the wiring before power on.
++**Electrode installation form**
--Installation Photo as reference:
++A:Side wall installation
--**~ Submerged installation:**
++B:Top flange installation
--The lead wire of the equipment passes through the waterproof pipe, and the 3/4 thread on the top of the equipment is connected to the 3/4 thread of the waterproof pipe with raw tape. Ensure that the top of the equipment and the equipment wire are not flooded.
++C:Pipeline bend installation
--[[image:image-20240715181933-4.png||height="281" width="258"]]
++D:Pipeline bend installation
--**~ Pipeline installation:**
++E:Flow-through installation
--Connect the equipment to the pipeline through the 3/4 thread.
++F:Submerged installation
--[[image:image-20240715182122-6.png||height="291" width="408"]]
++[[image:image-20240718190121-1.png||height="350" width="520"]]
--**Sampling:**
++**Several common installation methods of electrodes**
--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.
++When installing the sensor on site, you should strictly follow the correct installation method shown in the following picture. Incorrect installation method will cause data deviation.
--**Measure the pH of the water sample:**
++A. Several common incorrect installation methods
--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.
++[[image:image-20240718190204-2.png||height="262" width="487"]]
++Error cause: The electrode joint is too long, the extension part is too short, the sensor is easy to form a dead cavity, resulting in measurement error.
++[[image:image-20240718190221-3.png||height="292" width="500"]]
++
++Error cause: Measurement error or instability may occur due to water flow not being able to fill the pipe or air accumulation at high altitudes.
++
++B. Correct installation method
++
++[[image:image-20240718190249-4.png||height="287" width="515"]]
++
++
  == 1.6 Maintain ==
--* 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!
--* 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.
--* 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.
--* 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.
--* 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.
--* The electrode should be cleaned with deionized water before and after measurement to ensure accuracy.
--* 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.
--* 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.
--* (((
--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.
--)))
++* The equipment itself generally does not require daily maintenance. When an obvious fault occurs, please do not open it and repair it yourself, and contact us as soon as possible.
++* If the electrode is not used for a long time, it can generally be stored in a dry place, but it must be placed (stored) in distilled water for several hours before use to activate the electrode. Electrodes that are frequently used can be placed (stored) in distilled water.
++* Cleaning of conductivity electrodes: Organic stains on the electrode can be cleaned with warm water containing detergent, or with alcohol. Calcium and magnesium precipitates are best cleaned with 10% citric acid. The electrode plate or pole can only be cleaned by chemical methods or by shaking in water. Wiping the electrode plate will damage the coating (platinum black) on the electrode surface.
++* The equipment should be calibrated before each use. It is recommended to calibrate it every 3 months for long-term use. The calibration frequency should be adjusted appropriately according to different application conditions (degree of dirt in the application, deposition of chemical substances, etc.).
  == 1.7 RS485 Commands ==
@@ -136,7 +136,6 @@
 XE5
  )))
--
  === 1.7.4 Query data ===
  The address of the EC K10 sensor is 11
@@ -207,9 +207,76 @@
  = 2. DR-PH01 Water PH Sensor =
--== 2.7 RS485 Commands ==
++== 2.1 Specification:[[Edit>>url:http://wiki.dragino.com/xwiki/bin/edit/Main/Water%20Quality%20Sensors/WebHome?section=2]] ==
++* **Power Input**: DC7~~30
++* **Power Consumption** : < 0.5W
++* **Interface**: RS485. 9600 Baud Rate
++* **pH measurement range**: 0~~14.00pH; resolution: 0.01pH
++* **pH measurement error**:±0.15pH
++* **Repeatability error**:±0.02pH
++* **Temperature measurement range**:0~~60℃; resolution: 0.1℃ (set temperature for manual temperature compensation, default 25℃)
++* **Temperature measurement error**: ±0.5℃
++* **Temperature Measure Range**: -20 ~~ 60 °C
++* **Temperature Accuracy: **±0.5 °C
++* **IP Rated**: IP68
++* **Max Pressure**: 0.6MPa
++
++
++== 2.2 Wiring ==
++
++
++== (% style="color:inherit; font-family:inherit" %)2.3 (% style="color:inherit; font-family:inherit; font-size:26px" %)Mechinical Drawing(%%) ==
++
++[[image:image-20240714174241-2.png]]
++
++
++== 2.4 Installation Notice ==
++
++Do not power on while connect the cables. Double check the wiring before power on.
++
++Installation Photo as reference:
++
++**~ Submerged installation:**
++
++The lead wire of the equipment passes through the waterproof pipe, and the 3/4 thread on the top of the equipment is connected to the 3/4 thread of the waterproof pipe with raw tape. Ensure that the top of the equipment and the equipment wire are not flooded.
++
++[[image:image-20240718191348-6.png]]
++
++**~ Pipeline installation:**
++
++Connect the equipment to the pipeline through the 3/4 thread.
++
++[[image:image-20240718191336-5.png||height="239" width="326"]]
++
++**Sampling:**
++
++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.
++
++**Measure the pH of the water sample:**
++
++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.
++
++
++=== 2.5 Maintenance ===
++
++
++* 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!
++* 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.
++* 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.
++* 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.
++* 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.
++* The electrode should be cleaned with deionized water before and after measurement to ensure accuracy.
++* 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.
++* 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.
++* (((
++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.
++)))
++
++== 2.6 RS485 Commands ==
++
++
  The address of the pH  sensor is 10
  The query data command is 10 03 00 00 00 01 87 4B. After the query, 7 bytes will be returned.
@@ -259,5 +259,3 @@
  For example, the returned data is 15 03 02 (% style="color:red" %)**02 9A**(%%) 09 4C
 9A is the turbidity value, converted to decimal, it is 666, and then divided by 10, the actual value is 66.6, 02 9A means the current turbidity value is 66.6 NTU
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