[Coral-List] Damaged Temperature Loggers

Natalie Andersen nfa504 at york.ac.uk
Thu Jul 25 11:33:30 UTC 2019

Dear Coral List

I recently deployed four HOBO Water Temperature Pro v2 data loggers
(U22-001) in Pemba, Tanzania at depths of 1 m, 7 m, 15 m and 25 m. They had
been in-situ three months when a colleague went to check on them last week
and found that the two at 15 m and 25 m had suffered some kind of
catastrophic failure, I have attached photos. The two at 1 m and 7 m are in
good condition.
I had not put them in any kind of protective case as the boot manufactured
by Onset is advertised as being necessary only in harsh conditions, which I
didn't consider to be Pemba.

The manufacturer has stated they have never seen anything like this and
does not believe it to be a problem with the instrument. They have
suggested the cause is propeller damage (the loggers were too deep) and
marine life. I find it hard to believe that I am the only incidence of
predation given that these loggers are frequently used throughout the

I was therefore wondering if anyone had experienced anything similar?

Also I would appreciate if anyone has any recommendations for similar,
alternative instruments as I am due to deploy more but am hesitant at the

Thank you


Natalie Andersen
PhD Student
University of York
Department of Environment and Geography
University of York
Wentworth Way
York YO10 5NG

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