Water Level Sensing Equipment

Many options. What signal are you looking for?

0-10V 4-20ma etc.

How accurate do you need this to be?

Some types:

Liquid level float switches, very simple, inexpensive, robust, somewhat accurate. Look at Gems for options.

Capacitive Proximity sensors will work well depending on range, and are a non-contact type option. Peppurl & Fuchs makes some nice stuff.

Ultrasonic are very common for this application, and work well. Again, I would check with Peppurl & Fuchs.

It's impossible to simply tell you what to use without knowing what your sensing range, accuracy, repeatability, temperature, etc. requirements are.

I suggest figuring out exactly what it is you really need, and figure out what the output you are after is.

Ask yourself these:

1. What distance am I measuring from?
2. what is the allowable variation?
3. do I need simple switches, or real time measurement?
4. What is my required output signal?
5. How fast does the device need to sample?
6. How do I plan to mount this device? (Side mount tank top mount etc)
7. Do I have access to the component for maintenence once it's installed?
8. Are there any environmental hazards, corrosive gasses, or physical restrictions?

That should give you a good start to help narrow down your requirements to help you select the right type of component.
Once you can answer a few of these questions get back to us and we can help you decide what will work best for your application.Good luck.