I am working with a tdc1000-tdc7200 evm board for water level detection. I am trying to mount a steminc 1MHz ultrasonic transducer under a polycarbonate jar to measure the water level in the jar. According to TI's recommendation (source) I am using Cyanoacrylate for transducer mounting. I am wondering is there other options of adhesive that I can use for mounting? I am looking for an adhesive that does not react with water. Also TI recommended using hot glue over sensor which also absorbs. Is there a better alternative that does not hinder transducer performance?
Water improves superglue's bonding, I'm not sure I see the problem with using it (and the hot glue) in your application.
In any case, I suspect that they specify the CA glue and hot glue because they provide a good bond, are inexpensive and reversible.
That said, I have used a variety of 2 part epoxies for mounting sensors to a variety of materials. Make sure you've got it where you want it because once it sets, there's no do-overs.