Questions about SEN0237-A, SEN0169, and SEN0451 for continuous underwater use

Hello,

I recently purchased the sensors SEN0237-A, SEN0169, and SEN0451 from an online shop in Japan, and I am currently evaluating their use in water environments.

I have a few questions:

1. Lifetime in freshwater
What is the expected lifespan of these sensors when used continuously while submerged in freshwater?
It would be helpful to know the approximate lifetime for each model (SEN0237-A, SEN0169, SEN0451).

2. Use in saline water (~3%)
Can these sensors be used in water with a salinity of around 3%?

3. Lifetime in saline water (~3%)
If used continuously in water with about 3% salinity, what would be the expected lifespan of each sensor (SEN0237-A, SEN0169, SEN0451)?

Any information or experience would be appreciated.

Thanks in advance.