Electrical – HC-SR04 ultrasonic sensor water proofing

conformal-coatingwaterproof

I am using the above said HC-SR04 ultrasonic sensor with Arduino pro mini. Till now, able to get the range working properly.
My plan is to use this in the overhead tank to measure the quantity of the water present in the tank. My worry is that, the sensor will be facing the water vapour all the time as shown in the figure (Not actually my setup but close one).
enter image description here

  1. How can i protect the sensor from the vapors?
    I have conformal coating option but seriously i have no idea still about reaction of the sensor for the same. I could still protect rest of the circuitry.
  2. Whether the water vapor affect the measurement and behavior of the sensor?

Best Answer

Sorry for bumping up an old question but I'm in the same boat of requirement.

And to my surprise there are quite a few new sensors in town:

This one has 2 transducers instead of 1 therefore has less minimum detection distance as compared to JSN SR04T. It is also completely sealed and waterproof.

https://www.ebay.com/itm/253978673298

Before finalizing on this I had bought another one which was a waterproof modified version of HC-SR04 from here

https://www.ebay.com/itm/254058015473

The 1st one is much more rugged and waterproof as compared to the latter one.