Last modified by Xiaoling on 2022/12/29 17:35
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1 **~ Table of Contents：**
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3 {{toc/}}
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5
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7 = 1. Overview =
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10 This URL introduce different methods to detect the water / liquid level.
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12
13 = 2. Flow switch =
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15 == 2.1 How it works ==
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17
18 Below is an example of flow switch. and product link:
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20 [[https:~~/~~/www.amazon.com/Float-Switch-Septic-System-Sump/dp/B0064BHEVM/ref=sr_1_5?crid=2PCMSD63FBP42&keywords=float%2Bswitch&qid=1671230997&refinements=p_72%3A1248909011&rnid=1248907011&s=hi&sprefix=float%2Bswitch%2Caps%2C155&sr=1-5&th=1 >>https://www.amazon.com/Float-Switch-Septic-System-Sump/dp/B0064BHEVM/ref=sr_1_5?crid=2PCMSD63FBP42&keywords=float%2Bswitch&qid=1671230997&refinements=p_72%3A1248909011&rnid=1248907011&s=hi&sprefix=float%2Bswitch%2Caps%2C155&sr=1-5&th=1]]
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22 [[image:image-20221217164157-1.png||height="329" width="486"]]
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25 [[image:image-20221217164432-3.png||height="282" width="501"]][[image:image-20221217164337-2.png||height="279" width="431"]]
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27 The switch will switch on/off to show if the water / liquid has dedicate level.
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30 To use such switch with Dragino Products, use can connect it to LSN50v2 use the same way as a door switch. See reference link:
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32 [[http:~~/~~/wiki.dragino.com/xwiki/bin/view/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LSN50%20%26%20LSN50-V2%20-%20LoRaWAN%20Sensor%20Node%20User%20Manual/#H2.4.5DigitalInterrupt >>http://wiki.dragino.com/xwiki/bin/view/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LSN50%20%26%20LSN50-V2%20-%20LoRaWAN%20Sensor%20Node%20User%20Manual/#H2.4.5DigitalInterrupt]]
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34
35 == 2.2 Advantage & Disadvantage ==
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37
38 (% style="color:blue" %)**Advantage**(%%) : Reliable , Easy to install & Immue to different environment.
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40 (% style="color:red" %)**Disadvantage**(%%): Only be able to detect one speicify level. Not able to detect full range of water.
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42
43 = 3. Ultrasonic Sensor =
44
45 == 3.1 How it works? ==
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47
48 Such as [[LDDS75>>https://www.dragino.com/products/distance-level-sensor/item/161-ldds75.html]] / [[LDDS45>>https://www.dragino.com/products/distance-level-sensor/item/191-ldds45.html]]. They are using ultrasonic technologic to detect the distance between the probe and a flat object such as water level.
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50 Below is photo and URL shows how Ultrasonic Sensor works to detect Water Level
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52 [[https:~~/~~/www.electricalvolt.com/2022/06/ultrasonic-level-transmitter-working/ >>https://www.electricalvolt.com/2022/06/ultrasonic-level-transmitter-working/]]
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54 [[image:image-20221217170756-1.png||height="465" width="539"]]
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57 When choose the ultrasonic sensor, we need to check the measure range , blind spot and angel to fit the tank.
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59 An important notice, if there are moisture accumulated in the sense area of Ultrasonic Probe of LDDS75/LDDS45. the reading will become invalid.
60
61
62 == 3.2 Advantage & Disadvantage ==
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64
65 (% style="color:blue" %)**Advantage**(%%) :  Able to detect the level. Good Accurancy.
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67 (% style="color:red" %)**Disadvanage**(%%): Wrong reading when probe is block by moisture or other stuff. Affect by temperature.
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69
70 = 4. Pressure Sensor =
71
72 == 4.1 How it works? ==
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74
75 Pressure Sensor such as [[PS-LB>>https://www.dropbox.com/sh/eshhuk347xi1ce4/AAA4LUmYc2ITayfJUVsqK3wya?dl=0]] measures the pressure of the air / gas / liquid so can calcualte the liquid level.
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77 there are two types , (% style="color:blue" %)**Thread type** (%%)and (% style="color:blue" %)**Immersion type**(%%). as below:
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80 [[image:image-20221228143643-1.png||height="223" width="312"]] [[image:image-20221228144206-2.png||height="256" width="335"]]
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82
83 == 4.2 Advantage & Disadvantage ==
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85
86 (% style="color:blue" %)**Advantage**(%%) :  Able to detect air / gas / liquid pressure level. Immue to factors such as moisture / blocking. etc. Flexible for installation for
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88 (% style="color:red" %)**Disadvanage **(%%):
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