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The transducer is designed to work in a medium that is as dense as water. Less dense means less range. More dense is better (more sensitive) but may change the depth readings. If the dense medium is less than a couple of inches, it should not matter.
That said, it does not look like that your transducers is broke. Just make sure you don't install it again with air bubbles. I advise a wet mount.
/bing
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