I have a [KUS SSS][1] Water level sensor for my RV that I would like to have trigger a [NO 12v solenoid valve][2] to turn off when my tank has reached full (and ideally also sound a little piezo). The sensor ranges from 240 ohm empty to 33omh full. I'd like to trigger at about 50 omh I'm wondering what would be the simple circuit to make this happen?



  [1]: http://www.wemausa.com/sensors/level-FuelWater.shtml#.Xl6jixNKh24
  [2]: https://www.electricsolenoidvalves.com/1-2-12v-dc-electric-plastic-solenoid-valve-normally-open/?gclid=CjwKCAiAnfjyBRBxEiwA-EECLAhHHMXVI_ZEcoDEaIDnQ0uo8jUzUqBAN7lTIjnfzBfGlHnmLFBPkxoCLlEQAvD_BwE