Quick Question about sensor drift

Blue Robotics Products
1

Hey everyone, I was doing some reading on the different sensors for sale from blue robotics, and I saw that several of them (such as the pressure/temp sensor for 30 bar) need to be out of water for 2 hours/day to dry or it is prone to sensor drift. What causes this, and what sensors don’t suffer from it? I saw a post on here about a permanently submerged bluerov2 at 900m (super cool), and I was curious how these types of sensor problems are avoided? Are they using higher quality sensors, a different style of sensor, or just not necessarily utilizing that data? I’m working on some projects that would require sensors to be submerged in a marine environment for extended periods of time (months to years), and am curious how I can maintain sensor accuracy in the face of prolonged submersion and fouling, etc. Thanks everyone! I really appreciate all the knowledge and willingness to share it that is found on this platform.

  • Jeremy
2

Hi @FishingEngineer -
Only the Bar02 and Bar30 sensors are vulnerable to this drift, and potential failure, if exposed to water too long. They use a pressure sensor commonly found in dive computers, and when submersed for too long the gel that covers the sensor diaphragm can dissolve leading to measurement problems and even failure of the hardware…
The Bar100 uses a keller sensor that has a stainless-steel transducer, so this is not an issue. An update to the Bar sensor line is in the works that gives the smaller ranges with stainless steel sensors, eliminating the limitation!

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