Leak detection false alwarm after replacing acylic tube to aluminum tube

Anyone had the issue of leak detector false alarm after replacing acylic tube to aluminum tube?

Leak detection msg poped out after a few minutes the ROV dived into water (15m deep). Seems to me it is the water drops condensated on the inner wall tube when the warm air inside the tube meets the cold wall of the tube (water temp around 4 celsius degrees @ 15 meters underwater).

Is the silica gel a good solution for this?

@305155973, Yes you should try using the silica dessicant. It will remove the water from the air inside of the enclosure, and prevent condensation from forming.

Thanks Jacob. Will try and let you know how it works :slight_smile:

Slightly different issue, but my QGC always registers a leak, so I’ve now deactivated it. I don’t think its the sensor because I get the same issue even with the board unpowered. I’ve followed the manual for pin assignment and logic. I’m using QGC 3.1.3. Any thoughts on the cause?
Thanks

@spotxuv,

Is the LED turned on on the leak sensor board? If not, you definitely should not be registering a leak. If you can send a screen shot of your leak sensor setup screen that would be helpful.

-Rusty

We are having the same issues. Just assembled the kit and it has been logging a leak since the first power on.

Screen Shot of settings

We have completed the set up and preformed the leak down tests. Everything else looks like it works fine.

Any pointers would be appreciated.

Thank you,

Lucas

Hawthorne High

School of Manufacturing and Engineering

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Just got the same, no led light, and leak detection even if no detector is attached?

Hi Christian,

Can you verify that the 3-wire cable from the leak sensor to the Pixhawk is connected in the right direction? And can you share a screenshot of the settings page?

-Rusty

Will do :wink:

Hey, did you solve this? Currently experiencing the same situation. ROV was in dry air when we first got “leak detected”. None of the sensor pads were wet. Removed them both from our navigator, and still get the critical warning. Also a red light on the navigator.

Hi @Erlingns95 -
The leak detector circuit is incredibly sensitive! Replacing your sponge tips, and using fresh desiccant in the housing should prevent the false alarm…

I´m a bit sceptical, but of course I´ll give it a shot.

Please help me understand it a bit more. I understand that it registers some sort of resistance-change or short-circuit if you want, when water is absorbed by the sponge. But does it measure infinite Ohm when dry? Or does it have some sort of “resting-resistance” and gives of the alarm when this is altered?

The reason I´m sceptical is because I removed both of the sponges and still got new alarms. In my head it´s strange that a new leak-warning would show up when both of the I2C6 sensors measure infinite Ohm(no contanct).

Can I ask where you’re replying from? We usually don’t get answers this “early”, as the clock is about 7 in California right now. Writing this from Norway.
Feel free to not respond if this is too personal.

Hi @Erlingns95 -
You’re correct - the circuit is looking for any resistance, even a very high amount, between the probes. With the sponge removed and a leak still detected, moisture could be present somewhere else, like behind the leak sensor PCB, and so voltage is still finding a path…

I’m normally based in GMT-10, but am in California at the moment yes - it feels much later as I’m still adapting from a week spent in GMT-4. I’m also addicted to perusing our forums at all hours of the day and night!

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