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Last modified by Edwin Chen on 2025/06/26 11:53
From version 9.1
edited by Edwin Chen
on 2022/12/17 17:07
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To version 13.1
edited by Edwin Chen
on 2022/12/28 14:54
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Summary

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2 2  
3 3  {{toc/}}
4 4  
5 +
6 +
5 5  = Overview =
6 6  
7 7  This URL introduce different methods to detect the water / liquid level.
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36 36  
37 37  
38 38  
41 += Ultrasonic Sensor =
42 +
43 +== How it works? ==
44 +
45 +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.
46 +
47 +Below is photo and URL shows how Ultrasonic Sensor works to detect Water Level
48 +
49 +[[https:~~/~~/www.electricalvolt.com/2022/06/ultrasonic-level-transmitter-working/ >>https://www.electricalvolt.com/2022/06/ultrasonic-level-transmitter-working/]]
50 +
51 +[[image:image-20221217170756-1.png||height="465" width="539"]]
52 +
53 +
54 +When choose the ultrasonic sensor, we need to check the measure range , blind spot and angel to fit the tank.
55 +
56 +An important notice, if there are moisture accumulated in the sense area of Ultrasonic Probe of LDDS75/LDDS45. the reading will become invalid.
57 +
58 +
59 +== Advantage & Disadvantage ==
60 +
61 +**Advantage** : Able to detect the level. Good Accurancy.
62 +
63 +**Disadvanage**: Wrong reading when probe is block by moisture or other stuff. Affect by temperature.
64 +
65 +
66 += Pressure Sensor =
67 +
68 +== How it works? ==
69 +
70 +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.
71 +
72 +there are two types , **Thread type** and **Immersion type**. as below:
73 +
74 +
75 +[[image:image-20221228143643-1.png||height="223" width="312"]] [[image:image-20221228144206-2.png||height="256" width="335"]]
76 +
77 +
78 +== Advantage & Disadvantage ==
79 +
80 +**Advantage** : Able to detect air / gas / liquid pressure level. Immue to factors such as moisture / blocking. etc. Flexible for installation for
81 +
82 +**Disadvanage**:
83 +
84 +
85 +
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