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

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2 2  
3 3  {{toc/}}
4 4  
5 -
6 -
7 7  = Overview =
8 8  
9 9  This URL introduce different methods to detect the water / liquid level.
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38 38  
39 39  
40 40  
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 -
86 86  
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