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How to build in watertight ultrasonic transducer in a watertight box..

alkrojen

Hi fellow engineers

 

We have designed a range sensor by using this ultrasonics transducer

MCUSD18A40B12RS - MULTICOMP - TRANSCEIVER, 40KHZ, 18MM, METAL | Farnell element14 Danmark

as both a receiver and transmitter

It works fine on the PCB alone. But when we put the PCb into a plastic box, with  a hole matching the tip of the sensor, it no longer works

We  can make it work by cutting the hole bigger, so that the entire sensor is exposed. But then the box is no longer water tight..

 

The idea was that it should all be molded into the box, but this will also not be possible since this will require that the hole is tight

 

So my question is does anybody know how such a transducer is supposed to be installed in a box  and still work?

 

br.

Allan

Parents

  • The way this is handled in the marine industry (200Khz transducers are used for depth sounders) is that the sensor is remote from the electronics. And the sensor is usually water-proof and comes with some type of mount. Not sure if this would work in your case... But see Simrad 200-35 as an example: Acoustic sensor / level / for boats / fishfinder - 200-35 - Simrad  They have a line of transducers - some for fish finders are broad dispersion, some are narrow beam and more suitable for depth-sounding and measuring the level in storage tanks. And I only use them as an example.

     

    You may be able to either use one of their transducers or at least see how they handled the problem of keeping saltwater away from electronics.

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  • The way this is handled in the marine industry (200Khz transducers are used for depth sounders) is that the sensor is remote from the electronics. And the sensor is usually water-proof and comes with some type of mount. Not sure if this would work in your case... But see Simrad 200-35 as an example: Acoustic sensor / level / for boats / fishfinder - 200-35 - Simrad  They have a line of transducers - some for fish finders are broad dispersion, some are narrow beam and more suitable for depth-sounding and measuring the level in storage tanks. And I only use them as an example.

     

    You may be able to either use one of their transducers or at least see how they handled the problem of keeping saltwater away from electronics.

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