I went the ultrasonic route with a banner level sensor...4-20mA. IFM is great stuff. Easy laptop config
Wise choice. The biggest gripe I have with the probe I use is that I run kalk in my top off water. Every 6 months or so the kalk builds up on the probe and causes erroneous readings, sometimes causing an overflow condition to the Kent aquadoser. To eliminate the overflow problem, I timed how long it took to fill the 5 gallon aquadoser and programmed a fill timer in the plc. If, during a fill cycle, the fill time exceeds the preset, I shut off the fill pump and set an alarm on the HMI, that way I know there was a problem during the fill and it’s time to soak the probe in some vinegar. You shouldn’t have any of those issues with the ultrasonic sensor. You’ll have to let me know if you experience any difficulties dealing with wavy water and how that affects the level readings.