Changes for page Water Quality Sensors

Last modified by Karry Zhuang on 2025/02/18 15:43
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From version < 15.1 >
edited by Karry Zhuang
on 2024/07/18 16:14
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edited by Karry Zhuang
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37 37  == 1.5 Installation ==
38 38  
39 39  
40 +**Electrode installation form**
41 +
42 +A:Side wall installation
43 +
44 +B:Top flange installation
45 +
46 +C:Pipeline bend installation
47 +
48 +D:Pipeline bend installation
49 +
50 +E:Flow-through installation
51 +
52 +F:Submerged installation
53 +
54 +[[image:image-20240718190121-1.png||height="350" width="520"]]
55 +
56 +**Several common installation methods of electrodes**
57 +
58 +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.
59 +
60 +A. Several common incorrect installation methods
61 +
62 +[[image:image-20240718190204-2.png||height="262" width="487"]]
63 +
64 +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.
65 +
66 +[[image:image-20240718190221-3.png||height="292" width="500"]]
67 +
68 +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.
69 +
70 +B. Correct installation method
71 +
72 +[[image:image-20240718190249-4.png||height="287" width="515"]]
73 +
74 +
40 40  == 1.6 Maintain ==
41 41  
42 42  
78 +* 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.
79 +* 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.
80 +* 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.
81 +* 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.).
82 +
43 43  == 1.7 RS485 Commands ==
44 44  
45 -=== 1.7.1 Query data ===
46 46  
86 +RS485 signal (K1 default address 0x12; K10 default address 0x11):
87 +Standard Modbus-RTU protocol, baud rate: 9600; check bit: none; data bit: 8; stop bit: 1
88 +
89 +
90 +=== 1.7.1 Query address ===
91 +
92 +send
93 +
94 +(% border="1" cellspacing="3" style="background-color:#f2f2f2; width:676.25px" %)
95 +|=(% style="width: 50px;background-color:#4F81BD;color:white" %)Original address|=(% style="width: 50px;background-color:#4F81BD;color:white" %)Function code|=(% style="width: 50px;background-color:#4F81BD;color:white" %)Address high|=(% style="width: 50px;background-color:#4F81BD;color:white" %)Address low|=(% style="width: 50px;background-color:#4F81BD;color:white" %)Quantity high|=(% style="width: 1px; background-color: rgb(79, 129, 189); color: white;" %)Quantity low|=(% style="width: 50px;background-color:#4F81BD;color:white" %)CRC16 low|=(% style="width: 50px;background-color:#4F81BD;color:white" %)CRC16 high
96 +|(% style="width:99px" %)0XFE |(% style="width:112px" %)0X03|(% style="width:135px" %)0X00|(% style="width:126px" %)0X50|(% style="width:85px" %)0X00|(% style="width:1px" %)0X00|(% style="width:1px" %)0X51|(% style="width:1px" %)0XD4
97 +
98 +If you forget the original address of the sensor, you can use the broadcast address 0XFE instead. When using 0XFE, the host can only connect to one slave, which can be used as a method of address query.
99 +
100 +
101 +response
102 +
103 +(% border="1" cellspacing="3" style="background-color:#f2f2f2; width:561.333px" %)
104 +|=(% style="width: 50px;background-color:#4F81BD;color:white" %)New address|=(% style="width: 50px;background-color:#4F81BD;color:white" %)Function code|=(% style="width: 106px; background-color: rgb(79, 129, 189); color: white;" %)Data length|=(% style="width: 93px; background-color: rgb(79, 129, 189); color: white;" %)CRC16 low|=(% style="width: 104px; background-color: rgb(79, 129, 189); color: white;" %)CRC16 high
105 +|(% style="width:99px" %)0X1|(% style="width:112px" %)0X3|(% style="width:106px" %)0X00|(% style="width:93px" %)0X20|(% style="width:104px" %)0XF0
106 +
107 +=== 1.7.2 Change address ===
108 +
109 +For example: Change the address of the sensor with address 1 to 2, master → slave
110 +
111 +(% border="1" cellspacing="3" style="background-color:#f2f2f2; width:676.25px" %)
112 +|=(% style="width: 50px;background-color:#4F81BD;color:white" %)Original address|=(% style="width: 50px;background-color:#4F81BD;color:white" %)Function code|=(% style="width: 50px;background-color:#4F81BD;color:white" %)Address high|=(% style="width: 50px;background-color:#4F81BD;color:white" %)Address low|=(% style="width: 50px;background-color:#4F81BD;color:white" %)Quantity high|=(% style="width: 1px; background-color: rgb(79, 129, 189); color: white;" %)Quantity low|=(% style="width: 50px;background-color:#4F81BD;color:white" %)CRC16 low|=(% style="width: 50px;background-color:#4F81BD;color:white" %)CRC16 high
113 +|(% style="width:99px" %)0X01|(% style="width:112px" %)0X06|(% style="width:135px" %)0X00|(% style="width:126px" %)0X50|(% style="width:85px" %)0X00|(% style="width:1px" %)0X02|(% style="width:1px" %)0X08|(% style="width:1px" %)0X1A
114 +
115 +If the sensor receives correctly, the data is returned along the original path.
116 +Note: If you forget the original address of the sensor, you can use the broadcast address 0XFE instead. When using 0XFE, the host can only connect to one slave, and the return address is still the original address, which can be used as a method of address query.
117 +
118 +
119 +=== 1.7.3 Modify intercept ===
120 +
121 +
122 +send
123 +
124 +(% border="1" cellspacing="3" style="background-color:#f2f2f2; width:676.25px" %)
125 +|=(% style="width: 50px;background-color:#4F81BD;color:white" %)Address|=(% style="width: 50px;background-color:#4F81BD;color:white" %)Function code|=(% style="width: 50px;background-color:#4F81BD;color:white" %)Address high|=(% style="width: 50px;background-color:#4F81BD;color:white" %)Address low|=(% style="width: 50px;background-color:#4F81BD;color:white" %)Quantity high|=(% style="width: 1px; background-color: rgb(79, 129, 189); color: white;" %)Quantity low|=(% style="width: 50px;background-color:#4F81BD;color:white" %)CRC16 low|=(% style="width: 50px;background-color:#4F81BD;color:white" %)CRC16 high
126 +|(% style="width:99px" %)0X01|(% style="width:112px" %)0X06|(% style="width:135px" %)0X00|(% style="width:126px" %)0X23|(% style="width:85px" %)0X00|(% style="width:1px" %)0X01|(% style="width:1px" %)0XFA|(% style="width:1px" %)(((
127 +0X97
128 +)))
129 +
130 +Change the intercept of the sensor with address 1 to 10 (default 0), which is 0X000A in the command.
131 +
132 +response
133 +
134 +(% border="1" cellspacing="3" style="background-color:#f2f2f2; width:676.25px" %)
135 +|=(% style="width: 50px;background-color:#4F81BD;color:white" %)Address|=(% style="width: 50px;background-color:#4F81BD;color:white" %)Function code|=(% style="width: 50px;background-color:#4F81BD;color:white" %)Address high|=(% style="width: 50px;background-color:#4F81BD;color:white" %)Address low|=(% style="width: 50px;background-color:#4F81BD;color:white" %)Quantity high|=(% style="width: 1px; background-color: rgb(79, 129, 189); color: white;" %)Quantity low|=(% style="width: 50px;background-color:#4F81BD;color:white" %)CRC16 low|=(% style="width: 50px;background-color:#4F81BD;color:white" %)CRC16 high
136 +|(% style="width:99px" %)0X01|(% style="width:112px" %)0X06|(% style="width:135px" %)(((
137 +0X02
138 +)))|(% style="width:126px" %)0X00|(% style="width:85px" %)0X00|(% style="width:1px" %)0X0A|(% style="width:1px" %)0X0A|(% style="width:1px" %)(((
139 +0XE5
140 +)))
141 +
142 +=== 1.7.4 Query data ===
143 +
47 47  The address of the EC K10 sensor is 11
48 48  
49 49  The query data command is 11 03 00 00 00 02 C6 9B
... ... @@ -55,10 +55,10 @@
55 55  
56 56  The query data command is 12 03 00 00 00 02 C6 A8
57 57  
58 -For example, the returned data is 12 03 04 (% style="color:red" %)**02 AE**(%%) 01 64 B8 D0. 02 AE is converted to decimal 686,  K=1, EC: 686uS/cm.
155 +For example, the returned data is 12 03 04 (% style="color:red" %)**02 AE**(%%) 01 64 B8 D0. 02 AE is converted to decimal 686,  K=1, EC: 686uS/cm
59 59  
60 60  
61 -=== 1.7.2 Calibration Method ===
158 +=== 1.7.5 Calibration Method ===
62 62  
63 63  
64 64  This device uses one-point calibration, and you need to prepare a known E standard solution. When mileage K=1, 1~~2000 uses 1413μS/cm standard solution, and when mileage K=10, 10~~20000 uses 12.88mS/cm standard solution.
... ... @@ -80,14 +80,12 @@
80 80  
81 81  1413*10 gives 0X00003732
82 82  
83 -Return
180 +response
84 84  
85 85  (% border="1" cellspacing="3" style="background-color:#f2f2f2; width:676.25px" %)
86 86  |=(% style="width: 50px;background-color:#4F81BD;color:white" %)Address|=(% style="width: 50px;background-color:#4F81BD;color:white" %)Function code|=(% style="width: 50px;background-color:#4F81BD;color:white" %)Address high|=(% style="width: 50px;background-color:#4F81BD;color:white" %)Address low|=(% style="width: 50px;background-color:#4F81BD;color:white" %)Quantity high|=(% style="width: 1px; background-color: rgb(79, 129, 189); color: white;" %)Quantity low|=(% style="width: 50px;background-color:#4F81BD;color:white" %)CRC16 low|=(% style="width: 50px;background-color:#4F81BD;color:white" %)CRC16 high
87 87  |(% style="width:99px" %)0X12|(% style="width:112px" %)0X10|(% style="width:135px" %)0X00|(% style="width:126px" %)0X26|(% style="width:85px" %)0X00|(% style="width:1px" %)0X02|(% style="width:1px" %)0XA2|(% style="width:1px" %)0XA0
88 88  
89 -
90 -
91 91  (2) Place the electrode in distilled water to clean it. Use 12.88mS/cm standard solution for the range of 10~~20000. After the data is stable, enter the following calibration command
92 92  
93 93  (% border="1" cellspacing="3" style="background-color:#f2f2f2; width:676.25px" %)
... ... @@ -104,7 +104,7 @@
104 104  
105 105  12880*10 gives 0X01F720
106 106  
107 -Return
202 +response
108 108  
109 109  (% border="1" cellspacing="3" style="background-color:#f2f2f2; width:676.25px" %)
110 110  |=(% style="width: 50px;background-color:#4F81BD;color:white" %)Address|=(% style="width: 50px;background-color:#4F81BD;color:white" %)Function code|=(% style="width: 50px;background-color:#4F81BD;color:white" %)Address high|=(% style="width: 50px;background-color:#4F81BD;color:white" %)Address low|=(% style="width: 50px;background-color:#4F81BD;color:white" %)Quantity high|=(% style="width: 1px; background-color: rgb(79, 129, 189); color: white;" %)Quantity low|=(% style="width: 50px;background-color:#4F81BD;color:white" %)CRC16 low|=(% style="width: 50px;background-color:#4F81BD;color:white" %)CRC16 high
... ... @@ -112,13 +112,78 @@
112 112  
113 113  
114 114  
210 += 2. DR-PH01 Water PH Sensor =
115 115  
116 116  
117 -= 2. DR-PH01 Water PH Sensor =
213 +== 2.1 Specification:[[Edit>>url:http://wiki.dragino.com/xwiki/bin/edit/Main/Water%20Quality%20Sensors/WebHome?section=2]] ==
118 118  
119 -== 2.7 RS485 Commands ==
215 +* **Power Input**: DC7~~30
216 +* **Power Consumption** : < 0.5W
217 +* **Interface**: RS485. 9600 Baud Rate
218 +* **pH measurement range**: 0~~14.00pH; resolution: 0.01pH
219 +* **pH measurement error**:±0.15pH
220 +* **Repeatability error**:±0.02pH
221 +* **Temperature measurement range**:0~~60℃; resolution: 0.1℃ (set temperature for manual temperature compensation, default 25℃)
222 +* **Temperature measurement error**: ±0.5℃
223 +* **Temperature Measure Range**: -20 ~~ 60 °C
224 +* **Temperature Accuracy: **±0.5 °C
225 +* **IP Rated**: IP68
226 +* **Max Pressure**: 0.6MPa
120 120  
121 121  
229 +== 2.2 Wiring ==
230 +
231 +
232 +== (% style="color:inherit; font-family:inherit" %)2.3 (% style="color:inherit; font-family:inherit; font-size:26px" %)Mechinical Drawing(%%) ==
233 +
234 +[[image:image-20240714174241-2.png]]
235 +
236 +
237 +== 2.4 Installation Notice ==
238 +
239 +Do not power on while connect the cables. Double check the wiring before power on.
240 +
241 +Installation Photo as reference:
242 +
243 +**~ Submerged installation:**
244 +
245 +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.
246 +
247 +[[image:image-20240718191348-6.png]]
248 +
249 +**~ Pipeline installation:**
250 +
251 +Connect the equipment to the pipeline through the 3/4 thread.
252 +
253 +[[image:image-20240718191336-5.png||height="239" width="326"]]
254 +
255 +**Sampling:**
256 +
257 +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.
258 +
259 +**Measure the pH of the water sample:**
260 +
261 +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.
262 +
263 +
264 +=== 2.5 Maintenance ===
265 +
266 +
267 +* 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!
268 +* 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.
269 +* 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.
270 +* 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.
271 +* 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.
272 +* The electrode should be cleaned with deionized water before and after measurement to ensure accuracy.
273 +* 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.
274 +* 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.
275 +* (((
276 +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.
277 +)))
278 +
279 +== 2.6 RS485 Commands ==
280 +
281 +
122 122  The address of the pH  sensor is 10
123 123  
124 124  The query data command is 10 03 00 00 00 01 87 4B. After the query, 7 bytes will be returned.
... ... @@ -168,5 +168,3 @@
168 168  For example, the returned data is 15 03 02 (% style="color:red" %)**02 9A**(%%) 09 4C
169 169  
170 170  02 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
171 -
172 -
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