Hi.
I was designing a water level detection device to control the water level.n my application the sensor only needs to act as a switch.I saw another device that had a sensor thing and when it came out of water its temperature and voltage goes up and the MCU commands a relay.But i dont know what is this sensor thing.I think it is a PT.
Whats your idea?
This is a commercial project and the price is important.

 

Can you use a float-switch or pressure-switch?
What is the minimum change in water level that you need to sense?
What are the minimum and maximum levels?
Whether or not a PT/thermistor could work would depend on the temperatures difference, if any, of the water and the environment.

 

Whether or not a PT/thermistor could work would depend on the temperatures difference, if any, of the water and the environment.

You could have a small heater/thermistor combination which would ensure a difference.

 

Do you want to monitor water level over all or just a 'Full' level, if the latter, then a simple sealed float switch should work and are generally plentiful.
Max.

 

Can you use a float-switch or pressure-switch?
What is the minimum change in water level that you need to sense?
What are the minimum and maximum levels?
Whether or not a PT/thermistor could work would depend on the temperatures difference, if any, of the water and the environment.

I use it in a saltwater environment and the floater wont work after a while.
Its a switch.When the switch detects low water it turns the pump on for some minutes.
I searched the NTC liquid level detection and I think it works for me.

 

One example for top or bottom sensing.
Max.