#SpringFestivalTeardown——(Part 3)Teardown of an automatic water level controller

mars4zhu

#SpringFestivalTeardown——(Part 3)Teardown of an automatic water level controller [Copy link]

 

3.1. Introduction

The household tap water storage tank has always used an adjustable timer switch (model: RSDS-100), which can fill the empty tank in 20 minutes.

But sometimes the voltage changes cause the water pump to run fast, or when the water tank is not empty, the water tank will be filled with water after a fixed 20-minute interval and then overflow. For this reason, I bought an automatic water level controller online.

3.2. Disassembly Record

1. Controller appearance

   

2. Open the back cover

   

3. Take out the PCB, from left to right: rear cover, PCB, front cover

   

4. PCB close-up

   

5. Close-up of the main control: the model is CD4069BD, which is not an MCU but a simple logic chip

   

6. Transformer and relay close-up:

   

7. Relay model: CHEN-S-112DA2, coil voltage 12V, contact 25A/277V~

   

秦天qintian0303

What is the water level detection principle of this device?

xutong

It looks so dirty, my scalp tingles

lanhua

In the past, I designed an automatic water pumping controller.

One of the most successful key technologies is overcoming water level fluctuations!